a3c0588694
git-svn-id: http://skia.googlecode.com/svn/trunk@144 2bbb7eff-a529-9590-31e7-b0007b416f81
115 lines
3.7 KiB
C++
115 lines
3.7 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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struct GradData {
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int fCount;
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const SkColor* fColors;
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const SkScalar* fPos;
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};
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static const SkColor gColors[] = {
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SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK
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};
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static const SkScalar gPos0[] = { 0, SK_Scalar1 };
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static const SkScalar gPos1[] = { SK_Scalar1/4, SK_Scalar1*3/4 };
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static const SkScalar gPos2[] = {
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0, SK_Scalar1/8, SK_Scalar1/2, SK_Scalar1*7/8, SK_Scalar1
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};
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static const GradData gGradData[] = {
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{ 2, gColors, NULL },
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{ 2, gColors, gPos0 },
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{ 2, gColors, gPos1 },
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{ 5, gColors, NULL },
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{ 5, gColors, gPos2 }
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};
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static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data,
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SkShader::TileMode tm, SkUnitMapper* mapper) {
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return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos,
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data.fCount, tm, mapper);
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}
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static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data,
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SkShader::TileMode tm, SkUnitMapper* mapper) {
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SkPoint center;
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center.set(SkScalarAve(pts[0].fX, pts[1].fX),
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SkScalarAve(pts[0].fY, pts[1].fY));
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return SkGradientShader::CreateRadial(center, center.fX, data.fColors,
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data.fPos, data.fCount, tm, mapper);
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}
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static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data,
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SkShader::TileMode tm, SkUnitMapper* mapper) {
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SkPoint center;
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center.set(SkScalarAve(pts[0].fX, pts[1].fX),
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SkScalarAve(pts[0].fY, pts[1].fY));
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return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors,
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data.fPos, data.fCount, mapper);
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}
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typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data,
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SkShader::TileMode tm, SkUnitMapper* mapper);
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static const GradMaker gGradMakers[] = {
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MakeLinear, MakeRadial, MakeSweep
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};
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///////////////////////////////////////////////////////////////////////////////
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class GradientsView : public SkView {
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public:
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GradientsView() {}
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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, "Gradients");
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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(0xFFDDDDDD);
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}
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virtual void onDraw(SkCanvas* canvas) {
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this->drawBG(canvas);
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SkPoint pts[2] = {
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{ 0, 0 },
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{ SkIntToScalar(100), SkIntToScalar(100) }
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};
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SkShader::TileMode tm = SkShader::kClamp_TileMode;
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SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
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SkPaint paint;
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paint.setAntiAlias(true);
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canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
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for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) {
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canvas->save();
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for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) {
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SkShader* shader = gGradMakers[j](pts, gGradData[i], tm, NULL);
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paint.setShader(shader);
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canvas->drawRect(r, paint);
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shader->unref();
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canvas->translate(0, SkIntToScalar(120));
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}
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canvas->restore();
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canvas->translate(SkIntToScalar(120), 0);
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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() { return new GradientsView; }
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static SkViewRegister reg(MyFactory);
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