зеркало из https://github.com/mozilla/moz-skia.git
102 строки
3.1 KiB
C++
102 строки
3.1 KiB
C++
#include "SampleCode.h"
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#include "SkView.h"
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#include "SkCanvas.h"
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#include "SkGradientShader.h"
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#include "SkAvoidXfermode.h"
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///////////////////////////////////////////////////////////////////////////////
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class AvoidView : public SkView {
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SkShader* fShader;
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enum {
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W = 480,
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H = 320
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};
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public:
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AvoidView() {
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SkColor colors[] = { SK_ColorRED, SK_ColorYELLOW, SK_ColorGREEN, SK_ColorCYAN, SK_ColorBLUE };
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#if 0
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SkPoint pts[] = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
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fShader = SkGradientShader::CreateLinear(pts, colors, NULL,
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SK_ARRAY_COUNT(colors),
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SkShader::kMirror_TileMode);
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#else
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SkPoint pts[] = { SkIntToScalar(W)/2, SkIntToScalar(H)/2 };
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fShader = SkGradientShader::CreateRadial(pts[0], SkIntToScalar(H)/5,
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colors, NULL,
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SK_ARRAY_COUNT(colors),
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SkShader::kMirror_TileMode);
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#endif
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}
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virtual ~AvoidView() {
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fShader->unref();
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}
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protected:
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virtual bool onQuery(SkEvent* evt) {
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if (SampleCode::TitleQ(*evt)) {
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SampleCode::TitleR(evt, "AvoidXfermode");
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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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virtual void onDraw(SkCanvas* canvas) {
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canvas->drawColor(SK_ColorWHITE);
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SkPaint paint;
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SkRect r = { 0, 0, SkIntToScalar(W), SkIntToScalar(H) };
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canvas->translate(r.width() / 6, r.height() / 6);
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paint.setShader(fShader);
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canvas->drawRect(r, paint);
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static const struct {
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int fTolerance;
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SkAvoidXfermode::Mode fMode;
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float fDX, fDY;
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} gData[] = {
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{ 16, SkAvoidXfermode::kAvoidColor_Mode, 0, 0 },
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{ 255-16, SkAvoidXfermode::kAvoidColor_Mode, 1, 0 },
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{ 16, SkAvoidXfermode::kTargetColor_Mode, 0, 1 },
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{ 255-16, SkAvoidXfermode::kTargetColor_Mode, 1, 1 },
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};
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paint.setShader(NULL);
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paint.setColor(SK_ColorMAGENTA);
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SkPaint frameP;
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frameP.setStyle(SkPaint::kStroke_Style);
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for (size_t i = 0; i < SK_ARRAY_COUNT(gData); i++) {
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SkAvoidXfermode mode(SK_ColorGREEN, gData[i].fTolerance,
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gData[i].fMode);
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paint.setXfermode(&mode);
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int div = 3;
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SkRect rr = { 0, 0, r.width()/div, r.height()/div };
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rr.offset(r.width()/4 - rr.width()/2, r.height()/4 - rr.height()/2);
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rr.offset(r.width() * gData[i].fDX/2, r.height() * gData[i].fDY/2);
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canvas->drawRect(rr, paint);
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paint.setXfermode(NULL);
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canvas->drawRect(rr, frameP);
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}
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}
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private:
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typedef SkView INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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static SkView* MyFactory() {
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return new AvoidView;
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}
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static SkViewRegister reg(MyFactory);
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