зеркало из https://github.com/mozilla/moz-skia.git
90 строки
3.0 KiB
C++
90 строки
3.0 KiB
C++
#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); |