зеркало из https://github.com/mozilla/pjs.git
Bug 349178 - Implement getPathSegAtLength.
Patch by amenzie@us.ibm.com, r=tor, sr=roc
This commit is contained in:
tor%cs.brown.edu
Родитель
18d12280d2
Коммит
c3caf33717
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@ -1075,104 +1075,27 @@ nsSVGPathDataParserToInternal::ConvertArcToCurves(float x2, float y2,
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PRBool largeArcFlag,
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PRBool sweepFlag)
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{
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const double radPerDeg = M_PI/180.0;
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double x1=mPx, y1=mPy;
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// 1. Treat out-of-range parameters as described in
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float x1=mPx, y1=mPy, x3, y3;
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// Treat out-of-range parameters as described in
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// http://www.w3.org/TR/SVG/implnote.html#ArcImplementationNotes
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// If the endpoints (x1, y1) and (x2, y2) are identical, then this
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// is equivalent to omitting the elliptical arc segment entirely
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if (x1 == x2 && y1 == y2)
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if (x1 == x2 && y1 == y2) {
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return NS_OK;
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}
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// If rX = 0 or rY = 0 then this arc is treated as a straight line
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// segment (a "lineto") joining the endpoints.
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if (rx == 0.0f || ry == 0.0f) {
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return PathLineTo(x2, y2);
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}
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nsSVGArcConverter converter(x1, y1, x2, y2, rx, ry, angle,
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largeArcFlag, sweepFlag);
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// If rX or rY have negative signs, these are dropped; the absolute
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// value is used instead.
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if (rx<0.0) rx = -rx;
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if (ry<0.0) ry = -ry;
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// 2. convert to center parameterization as shown in
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// http://www.w3.org/TR/SVG/implnote.html
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double sinPhi = sin(angle*radPerDeg);
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double cosPhi = cos(angle*radPerDeg);
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double x1dash = cosPhi * (x1-x2)/2.0 + sinPhi * (y1-y2)/2.0;
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double y1dash = -sinPhi * (x1-x2)/2.0 + cosPhi * (y1-y2)/2.0;
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double root;
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double numerator = rx*rx*ry*ry - rx*rx*y1dash*y1dash - ry*ry*x1dash*x1dash;
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if (numerator < 0.0) {
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// If rX , rY and are such that there is no solution (basically,
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// the ellipse is not big enough to reach from (x1, y1) to (x2,
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// y2)) then the ellipse is scaled up uniformly until there is
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// exactly one solution (until the ellipse is just big enough).
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// -> find factor s, such that numerator' with rx'=s*rx and
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// ry'=s*ry becomes 0 :
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float s = (float)sqrt(1.0 - numerator/(rx*rx*ry*ry));
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rx *= s;
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ry *= s;
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root = 0.0;
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}
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else {
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root = (largeArcFlag == sweepFlag ? -1.0 : 1.0) *
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sqrt( numerator/(rx*rx*y1dash*y1dash + ry*ry*x1dash*x1dash) );
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}
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double cxdash = root*rx*y1dash/ry;
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double cydash = -root*ry*x1dash/rx;
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double cx = cosPhi * cxdash - sinPhi * cydash + (x1+x2)/2.0;
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double cy = sinPhi * cxdash + cosPhi * cydash + (y1+y2)/2.0;
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double theta1 = CalcVectorAngle(1.0, 0.0, (x1dash-cxdash)/rx, (y1dash-cydash)/ry);
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double dtheta = CalcVectorAngle((x1dash-cxdash)/rx, (y1dash-cydash)/ry,
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(-x1dash-cxdash)/rx, (-y1dash-cydash)/ry);
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if (!sweepFlag && dtheta>0)
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dtheta -= 2.0*M_PI;
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else if (sweepFlag && dtheta<0)
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dtheta += 2.0*M_PI;
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// 3. convert into cubic bezier segments <= 90deg
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int segments = (int)ceil(fabs(dtheta/(M_PI/2.0)));
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double delta = dtheta/segments;
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double t = 8.0/3.0 * sin(delta/4.0) * sin(delta/4.0) / sin(delta/2.0);
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for (int i = 0; i < segments; ++i) {
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double cosTheta1 = cos(theta1);
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double sinTheta1 = sin(theta1);
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double theta2 = theta1 + delta;
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double cosTheta2 = cos(theta2);
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double sinTheta2 = sin(theta2);
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// a) calculate endpoint of the segment:
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double xe = cosPhi * rx*cosTheta2 - sinPhi * ry*sinTheta2 + cx;
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double ye = sinPhi * rx*cosTheta2 + cosPhi * ry*sinTheta2 + cy;
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// b) calculate gradients at start/end points of segment:
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double dx1 = t * ( - cosPhi * rx*sinTheta1 - sinPhi * ry*cosTheta1);
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double dy1 = t * ( - sinPhi * rx*sinTheta1 + cosPhi * ry*cosTheta1);
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double dxe = t * ( cosPhi * rx*sinTheta2 + sinPhi * ry*cosTheta2);
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double dye = t * ( sinPhi * rx*sinTheta2 - cosPhi * ry*cosTheta2);
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while (converter.GetNextSegment(&x1, &y1, &x2, &y2, &x3, &y3)) {
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// c) draw the cubic bezier:
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nsresult rv = PathCurveTo(x1+dx1, y1+dy1, xe+dxe, ye+dye, xe, ye);
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nsresult rv = PathCurveTo(x1, y1, x2, y2, x3, y3);
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NS_ENSURE_SUCCESS(rv, rv);
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// do next segment
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theta1 = theta2;
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x1 = (float)xe;
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y1 = (float)ye;
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}
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return NS_OK;
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@ -1420,3 +1343,107 @@ nsSVGPathDataParserToDOM::StoreEllipticalArc(PRBool absCoords,
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largeArcFlag, sweepFlag));
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}
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nsSVGArcConverter::nsSVGArcConverter(float x1, float y1,
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float x2, float y2,
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float rx, float ry,
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float angle,
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PRBool largeArcFlag,
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PRBool sweepFlag)
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{
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const double radPerDeg = M_PI/180.0;
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// If rX or rY have negative signs, these are dropped; the absolute
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// value is used instead.
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mRx = fabs(rx);
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mRy = fabs(ry);
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// Convert to center parameterization as shown in
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// http://www.w3.org/TR/SVG/implnote.html
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mSinPhi = sin(angle*radPerDeg);
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mCosPhi = cos(angle*radPerDeg);
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double x1dash = mCosPhi * (x1-x2)/2.0 + mSinPhi * (y1-y2)/2.0;
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double y1dash = -mSinPhi * (x1-x2)/2.0 + mCosPhi * (y1-y2)/2.0;
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double root;
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double numerator = mRx*mRx*mRy*mRy - mRx*mRx*y1dash*y1dash -
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mRy*mRy*x1dash*x1dash;
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if (numerator < 0.0) {
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// If mRx , mRy and are such that there is no solution (basically,
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// the ellipse is not big enough to reach from (x1, y1) to (x2,
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// y2)) then the ellipse is scaled up uniformly until there is
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// exactly one solution (until the ellipse is just big enough).
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// -> find factor s, such that numerator' with mRx'=s*mRx and
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// mRy'=s*mRy becomes 0 :
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float s = (float)sqrt(1.0 - numerator/(mRx*mRx*mRy*mRy));
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mRx *= s;
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mRy *= s;
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root = 0.0;
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}
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else {
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root = (largeArcFlag == sweepFlag ? -1.0 : 1.0) *
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sqrt( numerator/(mRx*mRx*y1dash*y1dash + mRy*mRy*x1dash*x1dash) );
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}
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double cxdash = root*mRx*y1dash/mRy;
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double cydash = -root*mRy*x1dash/mRx;
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mCx = mCosPhi * cxdash - mSinPhi * cydash + (x1+x2)/2.0;
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mCy = mSinPhi * cxdash + mCosPhi * cydash + (y1+y2)/2.0;
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mTheta = CalcVectorAngle(1.0, 0.0, (x1dash-cxdash)/mRx, (y1dash-cydash)/mRy);
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double dtheta = CalcVectorAngle((x1dash-cxdash)/mRx, (y1dash-cydash)/mRy,
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(-x1dash-cxdash)/mRx, (-y1dash-cydash)/mRy);
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if (!sweepFlag && dtheta>0)
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dtheta -= 2.0*M_PI;
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else if (sweepFlag && dtheta<0)
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dtheta += 2.0*M_PI;
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// Convert into cubic bezier segments <= 90deg
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mNumSegs = NS_STATIC_CAST(int, ceil(fabs(dtheta/(M_PI/2.0))));
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mDelta = dtheta/mNumSegs;
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mT = 8.0/3.0 * sin(mDelta/4.0) * sin(mDelta/4.0) / sin(mDelta/2.0);
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mX1 = x1;
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mY1 = y1;
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mSegIndex = 0;
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}
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PRBool
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nsSVGArcConverter::GetNextSegment(float *x1, float *y1,
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float *x2, float *y2,
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float *x3, float *y3)
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{
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if (mSegIndex == mNumSegs) {
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return PR_FALSE;
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}
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float cosTheta1 = cos(mTheta);
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float sinTheta1 = sin(mTheta);
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float theta2 = mTheta + mDelta;
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float cosTheta2 = cos(theta2);
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float sinTheta2 = sin(theta2);
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// a) calculate endpoint of the segment:
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*x3 = mCosPhi * mRx*cosTheta2 - mSinPhi * mRy*sinTheta2 + mCx;
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*y3 = mSinPhi * mRx*cosTheta2 + mCosPhi * mRy*sinTheta2 + mCy;
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// b) calculate gradients at start/end points of segment:
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*x1 = mX1 + mT * ( - mCosPhi * mRx*sinTheta1 - mSinPhi * mRy*cosTheta1);
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*y1 = mY1 + mT * ( - mSinPhi * mRx*sinTheta1 + mCosPhi * mRy*cosTheta1);
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*x2 = *x3 + mT * ( mCosPhi * mRx*sinTheta2 + mSinPhi * mRy*cosTheta2);
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*y2 = *y3 + mT * ( mSinPhi * mRx*sinTheta2 - mCosPhi * mRy*cosTheta2);
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// do next segment
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mTheta = theta2;
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mX1 = *x3;
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mY1 = *y3;
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++mSegIndex;
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return PR_TRUE;
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}
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@ -221,4 +221,24 @@ private:
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nsCOMArray<nsIDOMSVGPathSeg>* mData;
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};
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class nsSVGArcConverter
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{
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public:
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nsSVGArcConverter(float x1, float y1,
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float x2, float y2,
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float rx, float ry,
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float angle,
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PRBool largeArcFlag,
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PRBool sweepFlag);
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PRBool GetNextSegment(float *x1, float *y1,
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float *x2, float *y2,
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float *x3, float *y3);
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protected:
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PRInt32 mNumSegs, mSegIndex;
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float mTheta, mDelta, mT;
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float mSinPhi, mCosPhi;
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float mX1, mY1, mRx, mRy, mCx, mCy;
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};
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#endif // __NS_SVGPATHDATAPARSER_H__
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@ -139,7 +139,38 @@ nsSVGPathElement::GetPointAtLength(float distance, nsIDOMSVGPoint **_retval)
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NS_IMETHODIMP
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nsSVGPathElement::GetPathSegAtLength(float distance, PRUint32 *_retval)
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{
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return NS_ERROR_NOT_IMPLEMENTED;
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//Check if mSegments is null
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nsresult rv = CreatePathSegList();
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NS_ENSURE_SUCCESS(rv, rv);
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PRUint32 i = 0, numSegments;
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float distCovered = 0;
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nsSVGPathSegTraversalState ts;
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mSegments->GetNumberOfItems(&numSegments);
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// There is no need to check to see if distance falls within the last segment
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// because if distance is longer than the total length of the path we return
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// the index of the final segment anyway.
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while (distCovered < distance && i < numSegments - 1) {
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nsIDOMSVGPathSeg *iSeg;
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mSegments->GetItem(i, &iSeg);
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nsSVGPathSeg* curSeg = NS_STATIC_CAST(nsSVGPathSeg*, iSeg);
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if (i == 0) {
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curSeg->GetLength(&ts);
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} else {
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distCovered += curSeg->GetLength(&ts);
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}
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if (distCovered >= distance) {
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break;
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}
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++i;
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}
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*_retval = i;
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return NS_OK;
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}
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/* nsIDOMSVGPathSegClosePath createSVGPathSegClosePath (); */
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@ -42,6 +42,15 @@
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#include "nsTextFormatter.h"
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#include "nsContentUtils.h"
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struct PathPoint {
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float x, y;
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};
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//----------------------------------------------------------------------
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// Error threshold to use when calculating the length of Bezier curves
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static const float PATH_SEG_LENGTH_TOLERANCE = 0.0000001f;
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//----------------------------------------------------------------------
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// implementation helper macros
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@ -54,6 +63,73 @@ NS_INTERFACE_MAP_BEGIN(ns##basename) \
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NS_INTERFACE_MAP_ENTRY_CONTENT_CLASSINFO(basename) \
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NS_INTERFACE_MAP_END_INHERITING(nsSVGPathSeg)
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//----------------------------------------------------------------------
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// GetLength Helper Functions
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static float GetDistance(float x1, float x2, float y1, float y2)
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{
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return sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));
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}
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static void SplitQuadraticBezier(PathPoint *curve,
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PathPoint *left,
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PathPoint *right)
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{
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left[0].x = curve[0].x;
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left[0].y = curve[0].y;
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right[2].x = curve[2].x;
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right[2].y = curve[2].y;
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left[1].x = (curve[0].x + curve[1].x) / 2;
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left[1].y = (curve[0].y + curve[1].y) / 2;
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right[1].x = (curve[1].x + curve[2].x) / 2;
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right[1].y = (curve[1].y + curve[2].y) / 2;
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left[2].x = right[0].x = (left[1].x + right[1].x) / 2;
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left[2].y = right[0].y = (left[1].y + right[1].y) / 2;
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}
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static void SplitCubicBezier(PathPoint *curve,
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PathPoint *left,
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PathPoint *right)
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{
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PathPoint tmp;
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tmp.x = (curve[1].x + curve[2].x) / 4;
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tmp.y = (curve[1].y + curve[2].y) / 4;
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left[0].x = curve[0].x;
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left[0].y = curve[0].y;
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right[3].x = curve[3].x;
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right[3].y = curve[3].y;
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left[1].x = (curve[0].x + curve[1].x) / 2;
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left[1].y = (curve[0].y + curve[1].y) / 2;
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right[2].x = (curve[2].x + curve[3].x) / 2;
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right[2].y = (curve[2].y + curve[3].y) / 2;
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left[2].x = left[1].x / 2 + tmp.x;
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left[2].y = left[1].y / 2 + tmp.y;
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right[1].x = right[2].x / 2 + tmp.x;
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right[1].y = right[2].y / 2 + tmp.y;
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left[3].x = right[0].x = (left[2].x + right[1].x) / 2;
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left[3].y = right[0].y = (left[2].y + right[1].y) / 2;
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}
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static float CalcBezLength(PathPoint *curve,PRUint32 numPts,
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void (*split)(PathPoint*, PathPoint*, PathPoint*))
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{
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PathPoint left[4];
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PathPoint right[4];
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float length = 0, dist;
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PRUint32 i;
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for (i = 0; i < numPts - 1; i++) {
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length += GetDistance(curve[i].x, curve[i+1].x, curve[i].y, curve[i+1].y);
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}
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dist = GetDistance(curve[0].x, curve[numPts - 1].x,
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curve[0].y, curve[numPts - 1].y);
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if (length - dist > PATH_SEG_LENGTH_TOLERANCE) {
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split(curve, left, right);
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return CalcBezLength(left, numPts, split) +
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CalcBezLength(right, numPts, split);
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}
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return length;
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}
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////////////////////////////////////////////////////////////////////////
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// nsSVGPathSeg
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@ -127,7 +203,7 @@ public:
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// nsSVGPathSeg methods:
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NS_IMETHOD GetValueString(nsAString& aValue);
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virtual float GetLength(nsSVGPathSegTraversalState *ts);
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virtual PRUint16 GetSegType()
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{ return nsIDOMSVGPathSeg::PATHSEG_CLOSEPATH; }
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};
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@ -154,6 +230,16 @@ nsSVGPathSegClosePath::GetValueString(nsAString& aValue)
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return NS_OK;
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}
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float
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nsSVGPathSegClosePath::GetLength(nsSVGPathSegTraversalState *ts)
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{
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float dist = GetDistance(ts->startPosX, ts->curPosX,
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ts->startPosY, ts->curPosY);
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ts->quadCPX = ts->cubicCPX = ts->curPosX = ts->startPosX;
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ts->quadCPY = ts->cubicCPY = ts->curPosY = ts->startPosY;
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return dist;
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}
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////////////////////////////////////////////////////////////////////////
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// nsSVGPathSegMovetoAbs
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@ -171,7 +257,7 @@ public:
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// nsSVGPathSeg methods:
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NS_IMETHOD GetValueString(nsAString& aValue);
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virtual float GetLength(nsSVGPathSegTraversalState *ts);
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virtual PRUint16 GetSegType()
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||||
{ return nsIDOMSVGPathSeg::PATHSEG_MOVETO_ABS; }
|
||||
|
||||
|
|
@ -210,6 +296,14 @@ nsSVGPathSegMovetoAbs::GetValueString(nsAString& aValue)
|
|||
return NS_OK;
|
||||
}
|
||||
|
||||
float
|
||||
nsSVGPathSegMovetoAbs::GetLength(nsSVGPathSegTraversalState *ts)
|
||||
{
|
||||
ts->cubicCPX = ts->quadCPX = ts->startPosX = ts->curPosX = mX;
|
||||
ts->cubicCPY = ts->quadCPY = ts->startPosY = ts->curPosY = mY;
|
||||
return 0;
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------
|
||||
// nsIDOMSVGPathSegMovetoAbs methods:
|
||||
|
||||
|
|
@ -257,7 +351,7 @@ public:
|
|||
|
||||
// nsSVGPathSeg methods:
|
||||
NS_IMETHOD GetValueString(nsAString& aValue);
|
||||
|
||||
virtual float GetLength(nsSVGPathSegTraversalState *ts);
|
||||
virtual PRUint16 GetSegType()
|
||||
{ return nsIDOMSVGPathSeg::PATHSEG_MOVETO_REL; }
|
||||
|
||||
|
|
@ -295,6 +389,15 @@ nsSVGPathSegMovetoRel::GetValueString(nsAString& aValue)
|
|||
|
||||
return NS_OK;
|
||||
}
|
||||
|
||||
float
|
||||
nsSVGPathSegMovetoRel::GetLength(nsSVGPathSegTraversalState *ts)
|
||||
{
|
||||
ts->cubicCPX = ts->quadCPX = ts->startPosX = ts->curPosX += mX;
|
||||
ts->cubicCPY = ts->quadCPY = ts->startPosY = ts->curPosY += mY;
|
||||
return 0;
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------
|
||||
// nsIDOMSVGPathSegMovetoRel methods:
|
||||
|
||||
|
|
@ -341,7 +444,7 @@ public:
|
|||
|
||||
// nsSVGPathSeg methods:
|
||||
NS_IMETHOD GetValueString(nsAString& aValue);
|
||||
|
||||
virtual float GetLength(nsSVGPathSegTraversalState *ts);
|
||||
virtual PRUint16 GetSegType()
|
||||
{ return nsIDOMSVGPathSeg::PATHSEG_LINETO_ABS; }
|
||||
|
||||
|
|
@ -379,6 +482,17 @@ nsSVGPathSegLinetoAbs::GetValueString(nsAString& aValue)
|
|||
|
||||
return NS_OK;
|
||||
}
|
||||
|
||||
float
|
||||
nsSVGPathSegLinetoAbs::GetLength(nsSVGPathSegTraversalState *ts)
|
||||
{
|
||||
|
||||
float dist = GetDistance(ts->curPosX, mX, ts->curPosY, mY);
|
||||
ts->cubicCPX = ts->quadCPX = ts->curPosX = mX;
|
||||
ts->cubicCPY = ts->quadCPY = ts->curPosY = mY;
|
||||
return dist;
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------
|
||||
// nsIDOMSVGPathSegLinetoAbs methods:
|
||||
|
||||
|
|
@ -426,7 +540,7 @@ public:
|
|||
|
||||
// nsSVGPathSeg methods:
|
||||
NS_IMETHOD GetValueString(nsAString& aValue);
|
||||
|
||||
virtual float GetLength(nsSVGPathSegTraversalState *ts);
|
||||
virtual PRUint16 GetSegType()
|
||||
{ return nsIDOMSVGPathSeg::PATHSEG_LINETO_REL; }
|
||||
|
||||
|
|
@ -465,6 +579,14 @@ nsSVGPathSegLinetoRel::GetValueString(nsAString& aValue)
|
|||
return NS_OK;
|
||||
}
|
||||
|
||||
float
|
||||
nsSVGPathSegLinetoRel::GetLength(nsSVGPathSegTraversalState *ts)
|
||||
{
|
||||
ts->cubicCPX = ts->quadCPX = ts->curPosX += mX;
|
||||
ts->cubicCPY = ts->quadCPY = ts->curPosY += mY;
|
||||
return sqrt(mX * mX + mY * mY);
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------
|
||||
// nsIDOMSVGPathSegLinetoRel methods:
|
||||
|
||||
|
|
@ -514,7 +636,7 @@ public:
|
|||
|
||||
// nsSVGPathSeg methods:
|
||||
NS_IMETHOD GetValueString(nsAString& aValue);
|
||||
|
||||
virtual float GetLength(nsSVGPathSegTraversalState *ts);
|
||||
virtual PRUint16 GetSegType()
|
||||
{ return nsIDOMSVGPathSeg::PATHSEG_CURVETO_CUBIC_ABS; }
|
||||
|
||||
|
|
@ -558,6 +680,22 @@ nsSVGPathSegCurvetoCubicAbs::GetValueString(nsAString& aValue)
|
|||
return NS_OK;
|
||||
}
|
||||
|
||||
float
|
||||
nsSVGPathSegCurvetoCubicAbs::GetLength(nsSVGPathSegTraversalState *ts)
|
||||
{
|
||||
PathPoint curve[4] = { {ts->curPosX, ts->curPosY},
|
||||
{mX1, mY1},
|
||||
{mX2, mY2},
|
||||
{mX, mY} };
|
||||
float dist = CalcBezLength(curve, 4, SplitCubicBezier);
|
||||
|
||||
ts->quadCPX = ts->curPosX = mX;
|
||||
ts->quadCPY = ts->curPosY = mY;
|
||||
ts->cubicCPX = mX2;
|
||||
ts->cubicCPY = mY2;
|
||||
return dist;
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------
|
||||
// nsIDOMSVGPathSegCurvetoCubicAbs methods:
|
||||
|
||||
|
|
@ -659,7 +797,7 @@ public:
|
|||
|
||||
// nsSVGPathSeg methods:
|
||||
NS_IMETHOD GetValueString(nsAString& aValue);
|
||||
|
||||
virtual float GetLength(nsSVGPathSegTraversalState *ts);
|
||||
virtual PRUint16 GetSegType()
|
||||
{ return nsIDOMSVGPathSeg::PATHSEG_CURVETO_CUBIC_REL; }
|
||||
|
||||
|
|
@ -703,6 +841,19 @@ nsSVGPathSegCurvetoCubicRel::GetValueString(nsAString& aValue)
|
|||
return NS_OK;
|
||||
}
|
||||
|
||||
float
|
||||
nsSVGPathSegCurvetoCubicRel::GetLength(nsSVGPathSegTraversalState *ts)
|
||||
{
|
||||
PathPoint curve[4] = { {0, 0}, {mX1, mY1}, {mX2, mY2}, {mX, mY} };
|
||||
float dist = CalcBezLength(curve, 4, SplitCubicBezier);
|
||||
|
||||
ts->cubicCPX = mX2 + ts->curPosX;
|
||||
ts->cubicCPY = mY2 + ts->curPosY;
|
||||
ts->quadCPX = ts->curPosX += mX;
|
||||
ts->quadCPY = ts->curPosY += mY;
|
||||
return dist;
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------
|
||||
// nsIDOMSVGPathSegCurvetoCubicRel methods:
|
||||
|
||||
|
|
@ -802,7 +953,7 @@ public:
|
|||
|
||||
// nsSVGPathSeg methods:
|
||||
NS_IMETHOD GetValueString(nsAString& aValue);
|
||||
|
||||
virtual float GetLength(nsSVGPathSegTraversalState *ts);
|
||||
virtual PRUint16 GetSegType()
|
||||
{ return nsIDOMSVGPathSeg::PATHSEG_CURVETO_QUADRATIC_ABS; }
|
||||
|
||||
|
|
@ -845,6 +996,19 @@ nsSVGPathSegCurvetoQuadraticAbs::GetValueString(nsAString& aValue)
|
|||
return NS_OK;
|
||||
}
|
||||
|
||||
float
|
||||
nsSVGPathSegCurvetoQuadraticAbs::GetLength(nsSVGPathSegTraversalState *ts)
|
||||
{
|
||||
PathPoint curve[3] = { {ts->curPosX, ts->curPosY}, {mX1, mY1}, {mX, mY} };
|
||||
float dist = CalcBezLength(curve, 3, SplitQuadraticBezier);
|
||||
|
||||
ts->quadCPX = mX1;
|
||||
ts->quadCPY = mY1;
|
||||
ts->cubicCPX = ts->curPosX = mX;
|
||||
ts->cubicCPY = ts->curPosY = mY;
|
||||
return dist;
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------
|
||||
// nsIDOMSVGPathSegCurvetoQuadraticAbs methods:
|
||||
|
||||
|
|
@ -919,7 +1083,7 @@ public:
|
|||
|
||||
// nsSVGPathSeg methods:
|
||||
NS_IMETHOD GetValueString(nsAString& aValue);
|
||||
|
||||
virtual float GetLength(nsSVGPathSegTraversalState *ts);
|
||||
virtual PRUint16 GetSegType()
|
||||
{ return nsIDOMSVGPathSeg::PATHSEG_CURVETO_QUADRATIC_REL; }
|
||||
|
||||
|
|
@ -963,6 +1127,19 @@ nsSVGPathSegCurvetoQuadraticRel::GetValueString(nsAString& aValue)
|
|||
return NS_OK;
|
||||
}
|
||||
|
||||
float
|
||||
nsSVGPathSegCurvetoQuadraticRel::GetLength(nsSVGPathSegTraversalState *ts)
|
||||
{
|
||||
PathPoint curve[3] = { {0, 0}, {mX1, mY1}, {mX, mY} };
|
||||
float dist = CalcBezLength(curve, 3, SplitQuadraticBezier);
|
||||
|
||||
ts->quadCPX = mX1 + ts->curPosX;
|
||||
ts->quadCPY = mY1 + ts->curPosY;
|
||||
ts->cubicCPX = ts->curPosX += mX;
|
||||
ts->cubicCPY = ts->curPosY += mY;
|
||||
return dist;
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------
|
||||
// nsIDOMSVGPathSegCurvetoQuadraticRel methods:
|
||||
|
||||
|
|
@ -1038,7 +1215,7 @@ public:
|
|||
|
||||
// nsSVGPathSeg methods:
|
||||
NS_IMETHOD GetValueString(nsAString& aValue);
|
||||
|
||||
virtual float GetLength(nsSVGPathSegTraversalState *ts);
|
||||
virtual PRUint16 GetSegType()
|
||||
{ return nsIDOMSVGPathSeg::PATHSEG_ARC_ABS; }
|
||||
|
||||
|
|
@ -1086,6 +1263,25 @@ nsSVGPathSegArcAbs::GetValueString(nsAString& aValue)
|
|||
return NS_OK;
|
||||
}
|
||||
|
||||
float
|
||||
nsSVGPathSegArcAbs::GetLength(nsSVGPathSegTraversalState *ts)
|
||||
{
|
||||
PathPoint bez[4] = { {ts->curPosX, ts->curPosY}, {0,0}, {0,0}, {0,0}};
|
||||
nsSVGArcConverter converter(ts->curPosX, ts->curPosY, mX, mY, mR1,
|
||||
mR2, mAngle, mLargeArcFlag, mSweepFlag);
|
||||
float dist = 0;
|
||||
while (converter.GetNextSegment(&bez[1].x, &bez[1].y, &bez[2].x, &bez[2].y,
|
||||
&bez[3].x, &bez[3].y))
|
||||
{
|
||||
dist += CalcBezLength(bez, 4, SplitCubicBezier);
|
||||
bez[0].x = bez[3].x;
|
||||
bez[0].y = bez[3].y;
|
||||
}
|
||||
ts->cubicCPX = ts->quadCPX = ts->curPosX = mX;
|
||||
ts->cubicCPY = ts->quadCPY = ts->curPosY = mY;
|
||||
return dist;
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------
|
||||
// nsIDOMSVGPathSegArcAbs methods:
|
||||
|
||||
|
|
@ -1200,7 +1396,7 @@ public:
|
|||
|
||||
// nsSVGPathSeg methods:
|
||||
NS_IMETHOD GetValueString(nsAString& aValue);
|
||||
|
||||
virtual float GetLength(nsSVGPathSegTraversalState *ts);
|
||||
virtual PRUint16 GetSegType()
|
||||
{ return nsIDOMSVGPathSeg::PATHSEG_ARC_REL; }
|
||||
|
||||
|
|
@ -1247,6 +1443,26 @@ nsSVGPathSegArcRel::GetValueString(nsAString& aValue)
|
|||
return NS_OK;
|
||||
}
|
||||
|
||||
float
|
||||
nsSVGPathSegArcRel::GetLength(nsSVGPathSegTraversalState *ts)
|
||||
{
|
||||
PathPoint bez[4] = { {0, 0}, {0,0}, {0,0}, {0,0}};
|
||||
nsSVGArcConverter converter(0, 0, mX, mY, mR1, mR2, mAngle,
|
||||
mLargeArcFlag, mSweepFlag);
|
||||
float dist = 0;
|
||||
while (converter.GetNextSegment(&bez[1].x, &bez[1].y, &bez[2].x, &bez[2].y,
|
||||
&bez[3].x, &bez[3].y))
|
||||
{
|
||||
dist += CalcBezLength(bez, 4, SplitCubicBezier);
|
||||
bez[0].x = bez[3].x;
|
||||
bez[0].y = bez[3].y;
|
||||
}
|
||||
|
||||
ts->cubicCPX = ts->quadCPX = ts->curPosX += mX;
|
||||
ts->cubicCPY = ts->quadCPY = ts->curPosY += mY;
|
||||
return dist;
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------
|
||||
// nsIDOMSVGPathSegArcRel methods:
|
||||
|
||||
|
|
@ -1359,7 +1575,7 @@ public:
|
|||
|
||||
// nsSVGPathSeg methods:
|
||||
NS_IMETHOD GetValueString(nsAString& aValue);
|
||||
|
||||
virtual float GetLength(nsSVGPathSegTraversalState *ts);
|
||||
virtual PRUint16 GetSegType()
|
||||
{ return nsIDOMSVGPathSeg::PATHSEG_LINETO_HORIZONTAL_ABS; }
|
||||
|
||||
|
|
@ -1399,6 +1615,15 @@ nsSVGPathSegLinetoHorizontalAbs::GetValueString(nsAString& aValue)
|
|||
return NS_OK;
|
||||
}
|
||||
|
||||
float
|
||||
nsSVGPathSegLinetoHorizontalAbs::GetLength(nsSVGPathSegTraversalState *ts)
|
||||
{
|
||||
float dist = fabs(mX - ts->curPosX);
|
||||
ts->cubicCPX = ts->quadCPX = ts->curPosX = mX;
|
||||
ts->cubicCPY = ts->quadCPY = ts->curPosY;
|
||||
return dist;
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------
|
||||
// nsIDOMSVGPathSegLinetoHorizontalAbs methods:
|
||||
|
||||
|
|
@ -1432,7 +1657,7 @@ public:
|
|||
|
||||
// nsSVGPathSeg methods:
|
||||
NS_IMETHOD GetValueString(nsAString& aValue);
|
||||
|
||||
virtual float GetLength(nsSVGPathSegTraversalState *ts);
|
||||
virtual PRUint16 GetSegType()
|
||||
{ return nsIDOMSVGPathSeg::PATHSEG_LINETO_HORIZONTAL_REL; }
|
||||
|
||||
|
|
@ -1472,6 +1697,14 @@ nsSVGPathSegLinetoHorizontalRel::GetValueString(nsAString& aValue)
|
|||
return NS_OK;
|
||||
}
|
||||
|
||||
float
|
||||
nsSVGPathSegLinetoHorizontalRel::GetLength(nsSVGPathSegTraversalState *ts)
|
||||
{
|
||||
ts->cubicCPX = ts->quadCPX = ts->curPosX += mX;
|
||||
ts->cubicCPY = ts->quadCPY = ts->curPosY;
|
||||
return fabs(mX);
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------
|
||||
// nsIDOMSVGPathSegLinetoHorizontalRel methods:
|
||||
|
||||
|
|
@ -1505,7 +1738,7 @@ public:
|
|||
|
||||
// nsSVGPathSeg methods:
|
||||
NS_IMETHOD GetValueString(nsAString& aValue);
|
||||
|
||||
virtual float GetLength(nsSVGPathSegTraversalState *ts);
|
||||
virtual PRUint16 GetSegType()
|
||||
{ return nsIDOMSVGPathSeg::PATHSEG_LINETO_VERTICAL_ABS; }
|
||||
|
||||
|
|
@ -1545,6 +1778,15 @@ nsSVGPathSegLinetoVerticalAbs::GetValueString(nsAString& aValue)
|
|||
return NS_OK;
|
||||
}
|
||||
|
||||
float
|
||||
nsSVGPathSegLinetoVerticalAbs::GetLength(nsSVGPathSegTraversalState *ts)
|
||||
{
|
||||
float dist = fabs(mY - ts->curPosY);
|
||||
ts->cubicCPY = ts->quadCPY = ts->curPosY = mY;
|
||||
ts->cubicCPX = ts->quadCPX = ts->curPosX;
|
||||
return dist;
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------
|
||||
// nsIDOMSVGPathSegLinetoVerticalAbs methods:
|
||||
|
||||
|
|
@ -1578,7 +1820,7 @@ public:
|
|||
|
||||
// nsSVGPathSeg methods:
|
||||
NS_IMETHOD GetValueString(nsAString& aValue);
|
||||
|
||||
virtual float GetLength(nsSVGPathSegTraversalState *ts);
|
||||
virtual PRUint16 GetSegType()
|
||||
{ return nsIDOMSVGPathSeg::PATHSEG_LINETO_VERTICAL_REL; }
|
||||
|
||||
|
|
@ -1619,6 +1861,14 @@ nsSVGPathSegLinetoVerticalRel::GetValueString(nsAString& aValue)
|
|||
return NS_OK;
|
||||
}
|
||||
|
||||
float
|
||||
nsSVGPathSegLinetoVerticalRel::GetLength(nsSVGPathSegTraversalState *ts)
|
||||
{
|
||||
ts->cubicCPY = ts->quadCPY = ts->curPosY += mY;
|
||||
ts->cubicCPX = ts->quadCPX = ts->curPosX;
|
||||
return fabs(mY);
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------
|
||||
// nsIDOMSVGPathSegLinetoVerticalRel methods:
|
||||
|
||||
|
|
@ -1653,7 +1903,7 @@ public:
|
|||
|
||||
// nsSVGPathSeg methods:
|
||||
NS_IMETHOD GetValueString(nsAString& aValue);
|
||||
|
||||
virtual float GetLength(nsSVGPathSegTraversalState *ts);
|
||||
virtual PRUint16 GetSegType()
|
||||
{ return nsIDOMSVGPathSeg::PATHSEG_CURVETO_CUBIC_SMOOTH_ABS; }
|
||||
|
||||
|
|
@ -1696,6 +1946,25 @@ nsSVGPathSegCurvetoCubicSmoothAbs::GetValueString(nsAString& aValue)
|
|||
return NS_OK;
|
||||
}
|
||||
|
||||
float
|
||||
nsSVGPathSegCurvetoCubicSmoothAbs::GetLength(nsSVGPathSegTraversalState *ts)
|
||||
{
|
||||
float x1 = 2 * ts->curPosX - ts->cubicCPX;
|
||||
float y1 = 2 * ts->curPosY - ts->cubicCPY;
|
||||
|
||||
PathPoint curve[4] = { {ts->curPosX, ts->curPosY},
|
||||
{x1, y1},
|
||||
{mX2, mY2},
|
||||
{mX, mY} };
|
||||
float dist = CalcBezLength(curve, 4, SplitCubicBezier);
|
||||
|
||||
ts->cubicCPX = mX2;
|
||||
ts->cubicCPY = mY2;
|
||||
ts->quadCPX = ts->curPosX = mX;
|
||||
ts->quadCPY = ts->curPosY = mY;
|
||||
return dist;
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------
|
||||
// nsIDOMSVGPathSegCurvetoCubicSmoothAbs methods:
|
||||
|
||||
|
|
@ -1769,7 +2038,7 @@ public:
|
|||
|
||||
// nsSVGPathSeg methods:
|
||||
NS_IMETHOD GetValueString(nsAString& aValue);
|
||||
|
||||
virtual float GetLength(nsSVGPathSegTraversalState *ts);
|
||||
virtual PRUint16 GetSegType()
|
||||
{ return nsIDOMSVGPathSeg::PATHSEG_CURVETO_CUBIC_SMOOTH_REL; }
|
||||
|
||||
|
|
@ -1812,6 +2081,23 @@ nsSVGPathSegCurvetoCubicSmoothRel::GetValueString(nsAString& aValue)
|
|||
return NS_OK;
|
||||
}
|
||||
|
||||
float
|
||||
nsSVGPathSegCurvetoCubicSmoothRel::GetLength(nsSVGPathSegTraversalState *ts)
|
||||
{
|
||||
|
||||
float x1 = ts->curPosX - ts->cubicCPX;
|
||||
float y1 = ts->curPosY - ts->cubicCPY;
|
||||
|
||||
PathPoint curve[4] = { {0, 0}, {x1, y1}, {mX2, mY2}, {mX, mY} };
|
||||
float dist = CalcBezLength(curve, 4, SplitCubicBezier);
|
||||
|
||||
ts->cubicCPX = mX2 + ts->curPosX;
|
||||
ts->cubicCPY = mY2 + ts->curPosY;
|
||||
ts->quadCPX = ts->curPosX += mX;
|
||||
ts->quadCPY = ts->curPosY += mY;
|
||||
return dist;
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------
|
||||
// nsIDOMSVGPathSegCurvetoCubicSmoothRel methods:
|
||||
|
||||
|
|
@ -1884,7 +2170,7 @@ public:
|
|||
|
||||
// nsSVGPathSeg methods:
|
||||
NS_IMETHOD GetValueString(nsAString& aValue);
|
||||
|
||||
virtual float GetLength(nsSVGPathSegTraversalState *ts);
|
||||
virtual PRUint16 GetSegType()
|
||||
{ return nsIDOMSVGPathSeg::PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS; }
|
||||
|
||||
|
|
@ -1923,6 +2209,22 @@ nsSVGPathSegCurvetoQuadraticSmoothAbs::GetValueString(nsAString& aValue)
|
|||
return NS_OK;
|
||||
}
|
||||
|
||||
float
|
||||
nsSVGPathSegCurvetoQuadraticSmoothAbs::GetLength(nsSVGPathSegTraversalState *ts)
|
||||
{
|
||||
ts->quadCPX = 2 * ts->curPosX - ts->quadCPX;
|
||||
ts->quadCPY = 2 * ts->curPosY - ts->quadCPY;
|
||||
|
||||
PathPoint bez[3] = { {ts->curPosX, ts->curPosY},
|
||||
{ts->quadCPX, ts->quadCPY},
|
||||
{mX, mY} };
|
||||
float dist = CalcBezLength(bez, 3, SplitQuadraticBezier);
|
||||
|
||||
ts->cubicCPX = ts->curPosX = mX;
|
||||
ts->cubicCPY = ts->curPosY = mY;
|
||||
return dist;
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------
|
||||
// nsIDOMSVGPathSegCurvetoQuadraticSmoothAbs methods:
|
||||
|
||||
|
|
@ -1969,7 +2271,7 @@ public:
|
|||
|
||||
// nsSVGPathSeg methods:
|
||||
NS_IMETHOD GetValueString(nsAString& aValue);
|
||||
|
||||
virtual float GetLength(nsSVGPathSegTraversalState *ts);
|
||||
virtual PRUint16 GetSegType()
|
||||
{ return nsIDOMSVGPathSeg::PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL; }
|
||||
|
||||
|
|
@ -2010,6 +2312,23 @@ nsSVGPathSegCurvetoQuadraticSmoothRel::GetValueString(nsAString& aValue)
|
|||
return NS_OK;
|
||||
}
|
||||
|
||||
float
|
||||
nsSVGPathSegCurvetoQuadraticSmoothRel::GetLength(nsSVGPathSegTraversalState *ts)
|
||||
{
|
||||
ts->quadCPX = ts->curPosX - ts->quadCPX;
|
||||
ts->quadCPY = ts->curPosY - ts->quadCPY;
|
||||
|
||||
PathPoint bez[3] = { {0, 0}, {ts->quadCPX, ts->quadCPY}, {mX, mY} };
|
||||
float dist = CalcBezLength(bez, 3, SplitQuadraticBezier);
|
||||
|
||||
ts->quadCPX += ts->curPosX;
|
||||
ts->quadCPY += ts->curPosY;
|
||||
|
||||
ts->cubicCPX = ts->curPosX += mX;
|
||||
ts->cubicCPY = ts->curPosY += mY;
|
||||
return dist;
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------------
|
||||
// nsIDOMSVGPathSegCurvetoQuadraticSmoothRel methods:
|
||||
|
||||
|
|
|
|||
|
|
@ -41,10 +41,22 @@
|
|||
|
||||
#include "nsIDOMSVGPathSeg.h"
|
||||
#include "nsIWeakReference.h"
|
||||
#include "nsSVGUtils.h"
|
||||
#include "nsSVGPathDataParser.h"
|
||||
|
||||
class nsSVGPathSegList;
|
||||
class nsISVGValue;
|
||||
|
||||
struct nsSVGPathSegTraversalState {
|
||||
float curPosX, startPosX, quadCPX, cubicCPX;
|
||||
float curPosY, startPosY, quadCPY, cubicCPY;
|
||||
nsSVGPathSegTraversalState()
|
||||
{
|
||||
curPosX = startPosX = quadCPX = cubicCPX = 0;
|
||||
curPosY = startPosY = quadCPY = cubicCPY = 0;
|
||||
}
|
||||
};
|
||||
|
||||
class nsSVGPathSeg : public nsIDOMSVGPathSeg
|
||||
{
|
||||
public:
|
||||
|
|
@ -58,6 +70,9 @@ public:
|
|||
NS_DECL_NSIDOMSVGPATHSEG
|
||||
NS_IMETHOD GetValueString(nsAString& aValue) = 0;
|
||||
|
||||
// nsSVGPathSeg methods:
|
||||
virtual float GetLength(nsSVGPathSegTraversalState *ts) = 0;
|
||||
|
||||
protected:
|
||||
virtual PRUint16 GetSegType() = 0;
|
||||
void DidModify();
|
||||
|
|
|
|||
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