mozilla
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moz-skia
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Код Задачи Пакеты Проекты Релизы Вики Активность
moz-skia/samplecode/SampleRotateCircles.cpp

486 строки
15 KiB
C++
Исходник Ответственный История

/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkRandom.h"
#include "SkRRect.h"
#include "SkColorPriv.h"
#include "SkStrokerPriv.h"
static void rotateAbout(SkCanvas* canvas, SkScalar degrees,
SkScalar cx, SkScalar cy) {
canvas->translate(cx, cy);
canvas->rotate(degrees);
canvas->translate(-cx, -cy);
}
class RotateCirclesView : public SampleView {
public:
RotateCirclesView() {
this->setBGColor(SK_ColorLTGRAY);
fAngle = 0;
}
protected:
// overrides from SkEventSink
virtual bool onQuery(SkEvent* evt) {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "RotateCircles");
return true;
}
return this->INHERITED::onQuery(evt);
}
virtual void onDrawContent(SkCanvas* canvas) {
SkRandom rand;
SkPaint paint;
paint.setAntiAlias(true);
paint.setStrokeWidth(20);
SkScalar cx = 240;
SkScalar cy = 240;
SkScalar DX = 240 * 2;
SkColor color = 0;
float scale = 1;
float sign = 0.3f;
for (SkScalar rad = 200; rad >= 20; rad -= 15) {
sign = -sign;
scale += 0.2f;
paint.setColor(rand.nextU());
paint.setAlpha(0xFF);
color = ~color;
paint.setStyle(SkPaint::kFill_Style);
canvas->save();
rotateAbout(canvas, fAngle * scale * sign, cx, cy);
canvas->drawCircle(cx, cy, rad, paint);
canvas->restore();
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(rad*2);
canvas->save();
rotateAbout(canvas, fAngle * scale * sign, cx + DX, cy);
canvas->drawCircle(cx + DX, cy, 10, paint);
canvas->restore();
canvas->save();
rotateAbout(canvas, fAngle * scale * sign, cx + DX, cy + DX);
canvas->drawCircle(cx + DX, cy + DX, 10, paint);
canvas->restore();
}
fAngle = (fAngle + 1) % 360;
this->inval(NULL);
}
private:
int fAngle;
typedef SkView INHERITED;
};
class TestCirclesView : public SampleView {
public:
TestCirclesView() {
}
protected:
virtual bool onQuery(SkEvent* evt) SK_OVERRIDE {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "RotateCircles2");
return true;
}
return this->INHERITED::onQuery(evt);
}
void draw_real_circle(SkCanvas* canvas, SkScalar radius) {
int w = SkScalarCeilToInt(radius * 2);
int h = w;
SkBitmap bm;
bm.allocN32Pixels(w, h);
bm.eraseColor(0);
SkAutoLockPixels alp(bm);
SkScalar cx = radius;
SkScalar cy = radius;
for (int y = 0; y < h; y += 1) {
for (int x = 0; x < w; x += 1) {
float d = sqrtf((x - cx)*(x - cx) + (y - cy)*(y - cy));
if (d <= radius) {
*bm.getAddr32(x, y) = SkPackARGB32(0xFF, 0, 0, 0);
}
}
}
canvas->drawBitmap(bm, 0, 0, NULL);
}
virtual void onDrawContent(SkCanvas* canvas) {
SkScalar radius = 256;
canvas->translate(10, 10);
draw_real_circle(canvas, radius);
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(0x80FF0000);
canvas->drawCircle(radius, radius, radius, paint);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(radius);
paint.setColor(0x8000FF00);
canvas->drawCircle(radius, radius, radius/2, paint);
}
private:
typedef SkView INHERITED;
};
static bool hittest(const SkPoint& target, SkScalar x, SkScalar y) {
const SkScalar TOL = 7;
return SkPoint::Distance(target, SkPoint::Make(x, y)) <= TOL;
}
static int getOnCurvePoints(const SkPath& path, SkPoint storage[]) {
SkPath::RawIter iter(path);
SkPoint pts[4];
SkPath::Verb verb;
int count = 0;
while ((verb = iter.next(pts)) != SkPath::kDone_Verb) {
switch (verb) {
case SkPath::kMove_Verb:
case SkPath::kLine_Verb:
case SkPath::kQuad_Verb:
case SkPath::kCubic_Verb:
storage[count++] = pts[0];
break;
default:
break;
}
}
return count;
}
#include "SkPathMeasure.h"
struct StrokeTypeButton {
SkRect fBounds;
char fLabel;
bool fEnabled;
};
class TestStrokeView : public SampleView {
enum {
SKELETON_COLOR = 0xFF0000FF,
WIREFRAME_COLOR = 0x80FF0000
};
enum {
kCount = 9
};
SkPoint fPts[kCount];
SkRect fErrorControl;
SkRect fWidthControl;
StrokeTypeButton fCubicButton;
StrokeTypeButton fQuadButton;
StrokeTypeButton fRRectButton;
SkScalar fWidth, fDWidth;
bool fAnimate;
#if QUAD_STROKE_APPROXIMATION && defined(SK_DEBUG)
#define kStrokerErrorMin 0.001f
#define kStrokerErrorMax 5
#endif
#define kWidthMin 1
#define kWidthMax 100
public:
TestStrokeView() {
this->setBGColor(SK_ColorLTGRAY);
fPts[0].set(50, 200);
fPts[1].set(50, 100);
fPts[2].set(150, 50);
fPts[3].set(300, 50);
fPts[4].set(350, 200);
fPts[5].set(350, 100);
fPts[6].set(450, 50);
fPts[7].set(200, 200);
fPts[8].set(400, 400);
fWidth = 50;
fDWidth = 0.25f;
fCubicButton.fLabel = 'C';
fCubicButton.fEnabled = true;
fQuadButton.fLabel = 'Q';
fQuadButton.fEnabled = true;
fRRectButton.fLabel = 'R';
fRRectButton.fEnabled = true;
fAnimate = true;
}
protected:
virtual bool onQuery(SkEvent* evt) SK_OVERRIDE {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "RotateCircles3");
return true;
}
return this->INHERITED::onQuery(evt);
}
virtual void onSizeChange() {
fErrorControl.setXYWH(this->width() - 100, 30, 30, 400);
fWidthControl.setXYWH(this->width() - 50, 30, 30, 400);
fCubicButton.fBounds.setXYWH(this->width() - 50, 450, 30, 30);
fQuadButton.fBounds.setXYWH(this->width() - 50, 500, 30, 30);
fRRectButton.fBounds.setXYWH(this->width() - 50, 550, 30, 30);
this->INHERITED::onSizeChange();
}
void draw_points(SkCanvas* canvas, const SkPath& path, SkColor color,
bool show_lines) {
SkPaint paint;
paint.setColor(color);
paint.setAlpha(0x80);
paint.setAntiAlias(true);
int n = path.countPoints();
SkAutoSTArray<32, SkPoint> pts(n);
if (show_lines) {
path.getPoints(pts.get(), n);
canvas->drawPoints(SkCanvas::kPolygon_PointMode, n, pts.get(), paint);
} else {
n = getOnCurvePoints(path, pts.get());
}
paint.setStrokeWidth(5);
canvas->drawPoints(SkCanvas::kPoints_PointMode, n, pts.get(), paint);
}
void draw_ribs(SkCanvas* canvas, const SkPath& path, SkScalar width,
SkColor color) {
const SkScalar radius = width / 2;
SkPathMeasure meas(path, false);
SkScalar total = meas.getLength();
SkScalar delta = 8;
SkPaint paint;
paint.setColor(color);
SkPoint pos, tan;
for (SkScalar dist = 0; dist <= total; dist += delta) {
if (meas.getPosTan(dist, &pos, &tan)) {
tan.scale(radius);
tan.rotateCCW();
canvas->drawLine(pos.x() + tan.x(), pos.y() + tan.y(),
pos.x() - tan.x(), pos.y() - tan.y(), paint);
}
}
}
void draw_stroke(SkCanvas* canvas, const SkPath& path, SkScalar width) {
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
paint.setColor(SKELETON_COLOR);
canvas->drawPath(path, paint);
draw_points(canvas, path, SKELETON_COLOR, true);
draw_ribs(canvas, path, width, 0xFF00FF00);
SkPath fill;
SkPaint p;
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(width);
p.getFillPath(path, &fill);
paint.setColor(WIREFRAME_COLOR);
canvas->drawPath(fill, paint);
draw_points(canvas, fill, WIREFRAME_COLOR, false);
}
void draw_button(SkCanvas* canvas, const StrokeTypeButton& button) {
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
paint.setColor(button.fEnabled ? 0xFF3F0000 : 0x6F3F0000);
canvas->drawRect(button.fBounds, paint);
paint.setTextSize(25.0f);
paint.setColor(button.fEnabled ? 0xFF3F0000 : 0x6F3F0000);
paint.setTextAlign(SkPaint::kCenter_Align);
paint.setStyle(SkPaint::kFill_Style);
canvas->drawText(&button.fLabel, 1, button.fBounds.centerX(), button.fBounds.fBottom - 5,
paint);
}
void draw_control(SkCanvas* canvas, const SkRect& bounds, SkScalar value,
SkScalar min, SkScalar max, const char* name) {
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
canvas->drawRect(bounds, paint);
SkScalar scale = max - min;
SkScalar yPos = bounds.fTop + (value - min) * bounds.height() / scale;
paint.setColor(0xFFFF0000);
canvas->drawLine(bounds.fLeft - 5, yPos, bounds.fRight + 5, yPos, paint);
SkString label;
label.printf("%0.3g", value);
paint.setColor(0xFF000000);
paint.setTextSize(11.0f);
paint.setStyle(SkPaint::kFill_Style);
canvas->drawText(label.c_str(), label.size(), bounds.fLeft + 5, yPos - 5, paint);
paint.setTextSize(13.0f);
canvas->drawText(name, strlen(name), bounds.fLeft, bounds.bottom() + 11, paint);
}
virtual void onDrawContent(SkCanvas* canvas) {
SkPath path;
SkScalar width = fWidth;
if (fCubicButton.fEnabled) {
path.moveTo(fPts[0]);
path.cubicTo(fPts[1], fPts[2], fPts[3]);
draw_stroke(canvas, path, width);
}
if (fQuadButton.fEnabled) {
path.reset();
path.moveTo(fPts[4]);
path.quadTo(fPts[5], fPts[6]);
draw_stroke(canvas, path, width);
}
if (fRRectButton.fEnabled) {
SkScalar rad = 32;
SkRect r;
r.set(&fPts[7], 2);
path.reset();
SkRRect rr;
rr.setRectXY(r, rad, rad);
path.addRRect(rr);
draw_stroke(canvas, path, width);
path.reset();
SkRRect rr2;
rr.inset(width/2, width/2, &rr2);
path.addRRect(rr2, SkPath::kCCW_Direction);
rr.inset(-width/2, -width/2, &rr2);
path.addRRect(rr2, SkPath::kCW_Direction);
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(0x40FF8844);
canvas->drawPath(path, paint);
}
if (fAnimate) {
fWidth += fDWidth;
if (fDWidth > 0 && fWidth > kWidthMax) {
fDWidth = -fDWidth;
} else if (fDWidth < 0 && fWidth < kWidthMin) {
fDWidth = -fDWidth;
}
}
#if QUAD_STROKE_APPROXIMATION && defined(SK_DEBUG)
draw_control(canvas, fErrorControl, gDebugStrokerError, kStrokerErrorMin, kStrokerErrorMax,
"error");
#endif
draw_control(canvas, fWidthControl, fWidth, kWidthMin, kWidthMax, "width");
draw_button(canvas, fQuadButton);
draw_button(canvas, fCubicButton);
draw_button(canvas, fRRectButton);
this->inval(NULL);
}
class MyClick : public Click {
public:
int fIndex;
MyClick(SkView* target, int index) : Click(target), fIndex(index) {}
};
virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y,
unsigned modi) SK_OVERRIDE {
for (size_t i = 0; i < SK_ARRAY_COUNT(fPts); ++i) {
if (hittest(fPts[i], x, y)) {
return new MyClick(this, (int)i);
}
}
const SkRect& rectPt = SkRect::MakeXYWH(x, y, 1, 1);
#if QUAD_STROKE_APPROXIMATION && defined(SK_DEBUG)
if (fErrorControl.contains(rectPt)) {
return new MyClick(this, (int) SK_ARRAY_COUNT(fPts) + 1);
}
#endif
if (fWidthControl.contains(rectPt)) {
return new MyClick(this, (int) SK_ARRAY_COUNT(fPts) + 3);
}
if (fCubicButton.fBounds.contains(rectPt)) {
fCubicButton.fEnabled ^= true;
return new MyClick(this, (int) SK_ARRAY_COUNT(fPts) + 4);
}
if (fQuadButton.fBounds.contains(rectPt)) {
fQuadButton.fEnabled ^= true;
return new MyClick(this, (int) SK_ARRAY_COUNT(fPts) + 5);
}
if (fRRectButton.fBounds.contains(rectPt)) {
fRRectButton.fEnabled ^= true;
return new MyClick(this, (int) SK_ARRAY_COUNT(fPts) + 6);
}
return this->INHERITED::onFindClickHandler(x, y, modi);
}
static SkScalar MapScreenYtoValue(int y, const SkRect& control, SkScalar min,
SkScalar max) {
return (SkIntToScalar(y) - control.fTop) / control.height() * (max - min) + min;
}
virtual bool onClick(Click* click) {
int index = ((MyClick*)click)->fIndex;
if (index < (int) SK_ARRAY_COUNT(fPts)) {
fPts[index].offset(SkIntToScalar(click->fICurr.fX - click->fIPrev.fX),
SkIntToScalar(click->fICurr.fY - click->fIPrev.fY));
this->inval(NULL);
}
#if QUAD_STROKE_APPROXIMATION && defined(SK_DEBUG)
else if (index == (int) SK_ARRAY_COUNT(fPts) + 1) {
gDebugStrokerError = MapScreenYtoValue(click->fICurr.fY, fErrorControl,
kStrokerErrorMin, kStrokerErrorMax);
gDebugStrokerErrorSet = true;
}
#endif
else if (index == (int) SK_ARRAY_COUNT(fPts) + 3) {
fWidth = MapScreenYtoValue(click->fICurr.fY, fWidthControl, kWidthMin, kWidthMax);
fAnimate = fWidth <= kWidthMin;
}
return true;
}
private:
typedef SkView INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
static SkView* F0() { return new RotateCirclesView; }
static SkViewRegister gR0(F0);
static SkView* F1() { return new TestCirclesView; }
static SkViewRegister gR1(F1);
static SkView* F2() { return new TestStrokeView; }
static SkViewRegister gR2(F2);
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