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#include "SampleCode.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
class GradientView : public SampleView {
public:
GradientView() {
this->setBGColor(0xFFDDDDDD);
}
protected:
struct GradData {
int fCount;
const SkColor* fColors;
const SkScalar* fPos;
};
// overrides from SkEventSink
virtual bool onQuery(SkEvent* evt) {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "Gradients");
return true;
}
return this->INHERITED::onQuery(evt);
}
virtual void onDrawContent(SkCanvas* canvas) {
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(SkScalarHalf(SkIntToScalar(3)));
paint.setStyle(SkPaint::kFill_Style);
SkPoint p = SkPoint::Make(0,0);
SkPoint q = SkPoint::Make(100,100);
SkPoint pts[] = {p, q};
SkScalar t, temp, x, y;
SkColor gColors[] = {
SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK
};
t = SampleCode::GetAnimScalar(SkIntToScalar(2), SkIntToScalar(20));
temp = SampleCode::GetAnimScalar(SkIntToScalar(1), SkIntToScalar(8));
SkScalar step = SK_ScalarPI / (10);
SkScalar angle = t * step;
x = SkScalarSinCos(angle, &y);
SkScalar colorPositions[] = { 0, 0.1 + x, 0.4 + y, 0.9 - x + y, 1.0};
GradData data = { 5, gColors, colorPositions };
SkRect r = { 0, 0, SkIntToScalar(200), SkIntToScalar(200) };
SkShader* shader1 = SkGradientShader::CreateLinear(
pts, data.fColors, data.fPos,data.fCount,
SkShader::kMirror_TileMode);
paint.setShader(shader1)->unref();
canvas->drawRect(r, paint);
SkPoint s = SkPoint::Make(100,100);
SkShader* shader2 = SkGradientShader::CreateRadial(
s, 100, data.fColors, data.fPos, data.fCount,
SkShader::kMirror_TileMode);
paint.setShader(shader2)->unref();
canvas->translate(250, 0);
canvas->drawRect(r, paint);
SkShader* shader3 = SkGradientShader::CreateTwoPointRadial(
p, 0, q, 100, data.fColors, data.fPos, data.fCount,
SkShader::kMirror_TileMode);
paint.setShader(shader3)->unref();
canvas->translate(0, 250);
canvas->drawRect(r, paint);
SkShader* shader4 = SkGradientShader::CreateSweep(
100, 100, data.fColors, data.fPos, data.fCount);
paint.setShader(shader4)->unref();
canvas->translate(-250, 0);
canvas->drawRect(r, paint);
this->inval(NULL);
}
private:
typedef SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new GradientView; }
static SkViewRegister reg(MyFactory);
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