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