зеркало из https://github.com/mozilla/moz-skia.git
136 строки
3.8 KiB
C++
136 строки
3.8 KiB
C++
#include "SampleCode.h"
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#include "SkView.h"
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#include "SkCanvas.h"
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#include "SkDevice.h"
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#include "SkPaint.h"
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// ensure that we don't accidentally screw up the bounds when the oval is
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// fractional, and the impl computes the center and radii, and uses them to
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// reconstruct the edges of the circle.
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// see bug# 1504910
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static void test_circlebounds(SkCanvas* canvas) {
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#ifdef SK_SCALAR_IS_FLOAT
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SkRect r = { 1.39999998, 1, 21.3999996, 21 };
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SkPath p;
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p.addOval(r);
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SkASSERT(r == p.getBounds());
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#endif
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}
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class CircleView : public SkView {
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public:
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static const SkScalar ANIM_DX = SK_Scalar1 / 67;
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static const SkScalar ANIM_DY = SK_Scalar1 / 29;
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static const SkScalar ANIM_RAD = SK_Scalar1 / 19;
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SkScalar fDX, fDY, fRAD;
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CircleView() {
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fDX = fDY = fRAD = 0;
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}
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protected:
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// overrides from SkEventSink
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virtual bool onQuery(SkEvent* evt) {
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if (SampleCode::TitleQ(*evt)) {
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SampleCode::TitleR(evt, "Circles");
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return true;
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}
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return this->INHERITED::onQuery(evt);
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}
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void drawBG(SkCanvas* canvas) {
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canvas->drawColor(SK_ColorWHITE);
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}
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void circle(SkCanvas* canvas, int width, bool aa) {
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SkPaint paint;
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paint.setAntiAlias(aa);
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if (width < 0) {
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paint.setStyle(SkPaint::kFill_Style);
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} else {
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(SkIntToScalar(width));
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}
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canvas->drawCircle(0, 0, SkIntToScalar(9) + fRAD, paint);
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}
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void drawSix(SkCanvas* canvas, SkScalar dx, SkScalar dy) {
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for (int width = -1; width <= 1; width++) {
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canvas->save();
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circle(canvas, width, false);
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canvas->translate(0, dy);
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circle(canvas, width, true);
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canvas->restore();
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canvas->translate(dx, 0);
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}
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}
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static void blowup(SkCanvas* canvas, const SkIRect& src, const SkRect& dst) {
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SkDevice* device = canvas->getDevice();
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const SkBitmap& bm = device->accessBitmap(false);
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canvas->drawBitmapRect(bm, &src, dst, NULL);
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}
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virtual void onDraw(SkCanvas* canvas) {
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this->drawBG(canvas);
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test_circlebounds(canvas);
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if (false) {
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// canvas->translate(SK_ScalarHalf, SK_ScalarHalf);
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setStyle(SkPaint::kStroke_Style);
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canvas->drawCircle(SkIntToScalar(10), SkIntToScalar(10), SkIntToScalar(2), paint);
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SkIRect r;
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r.set(7, 7, 13, 13);
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SkRect dst;
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dst.set(SkIntToScalar(100), SkIntToScalar(10), SkIntToScalar(200), SkIntToScalar(110));
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blowup(canvas, r, dst);
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return;
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}
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// test that degenerate rects do nothing
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if (true) {
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SkScalar x = SkIntToScalar(30);
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SkRect r;
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r.set(x, x, x, x);
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SkPaint p;
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canvas->drawRect(r, p);
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p.setAntiAlias(true);
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canvas->drawRect(r, p);
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}
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SkScalar dx = SkIntToScalar(32);
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SkScalar dy = SkIntToScalar(32);
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canvas->translate(dx + fDX, dy + fDY);
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drawSix(canvas, dx, dy);
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canvas->translate(dx, 0);
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canvas->translate(SK_ScalarHalf, SK_ScalarHalf);
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drawSix(canvas, dx, dy);
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fDX += ANIM_DX;
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fDY += ANIM_DY;
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fRAD += ANIM_RAD;
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this->inval(NULL);
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}
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private:
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typedef SkView INHERITED;
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};
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const SkScalar CircleView::ANIM_DX;
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const SkScalar CircleView::ANIM_DY;
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const SkScalar CircleView::ANIM_RAD;
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//////////////////////////////////////////////////////////////////////////////
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static SkView* MyFactory() { return new CircleView; }
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static SkViewRegister reg(MyFactory);
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