samplecode/SampleFillType.cpp

   1 /*
   2  * Copyright 2011 Google Inc.
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7 #include "SampleCode.h"
   8 #include "SkView.h"
   9 #include "SkCanvas.h"
  10 #include "SkCornerPathEffect.h"
  11 #include "SkGradientShader.h"
  12 #include "SkPath.h"
  13 #include "SkRegion.h"
  14 #include "SkShader.h"
  15 #include "SkUtils.h"
  16
  17 class FillTypeView : public SampleView {
  18     SkPath fPath;
  19 public:
  20     FillTypeView() {
  21         const SkScalar radius = SkIntToScalar(45);
  22         fPath.addCircle(SkIntToScalar(50), SkIntToScalar(50), radius);
  23         fPath.addCircle(SkIntToScalar(100), SkIntToScalar(100), radius);
  24
  25         this->setBGColor(0xFFDDDDDD);
  26     }
  27
  28 protected:
  29     // overrides from SkEventSink
  30     virtual bool onQuery(SkEvent* evt) {
  31         if (SampleCode::TitleQ(*evt)) {
  32             SampleCode::TitleR(evt, "FillType");
  33             return true;
  34         }
  35         return this->INHERITED::onQuery(evt);
  36     }
  37
  38     void showPath(SkCanvas* canvas, int x, int y, SkPath::FillType ft,
  39                   SkScalar scale, const SkPaint& paint) {
  40
  41         const SkRect r = { 0, 0, SkIntToScalar(150), SkIntToScalar(150) };
  42
  43         canvas->save();
  44         canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
  45         canvas->clipRect(r);
  46         canvas->drawColor(SK_ColorWHITE);
  47         fPath.setFillType(ft);
  48         canvas->translate(r.centerX(), r.centerY());
  49         canvas->scale(scale, scale);
  50         canvas->translate(-r.centerX(), -r.centerY());
  51         canvas->drawPath(fPath, paint);
  52         canvas->restore();
  53     }
  54
  55     void showFour(SkCanvas* canvas, SkScalar scale, const SkPaint& paint) {
  56         showPath(canvas,   0,   0, SkPath::kWinding_FillType,
  57                  scale, paint);
  58         showPath(canvas, 200,   0, SkPath::kEvenOdd_FillType,
  59                  scale, paint);
  60         showPath(canvas,  00, 200, SkPath::kInverseWinding_FillType,
  61                  scale, paint);
  62         showPath(canvas, 200, 200, SkPath::kInverseEvenOdd_FillType,
  63                  scale, paint);
  64     }
  65
  66     virtual void onDrawContent(SkCanvas* canvas) {
  67         canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
  68
  69         SkPaint paint;
  70         const SkScalar scale = SkIntToScalar(5)/4;
  71
  72         paint.setAntiAlias(false);
  73         paint.setColor(0x8000FF00);
  74
  75         showFour(canvas, SK_Scalar1, paint);
  76         canvas->translate(SkIntToScalar(450), 0);
  77         showFour(canvas, scale, paint);
  78
  79         paint.setAntiAlias(true);
  80
  81         canvas->translate(SkIntToScalar(-450), SkIntToScalar(450));
  82         showFour(canvas, SK_Scalar1, paint);
  83         canvas->translate(SkIntToScalar(450), 0);
  84         showFour(canvas, scale, paint);
  85     }
  86
  87 private:
  88     typedef SampleView INHERITED;
  89 };
  90
  91 //////////////////////////////////////////////////////////////////////////////
  92
  93 static SkView* MyFactory() { return new FillTypeView; }
  94 static SkViewRegister reg(MyFactory);