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      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 
      8 #include "gm.h"
      9 #include "SkGradientShader.h"
     10 #include "SkPath.h"
     11 
     12 namespace skiagm {
     13 
     14 class FillTypePerspGM : public GM {
     15     SkPath fPath;
     16 public:
     17     FillTypePerspGM() {}
     18 
     19     void makePath() {
     20         if (fPath.isEmpty()) {
     21             const SkScalar radius = SkIntToScalar(45);
     22             fPath.addCircle(SkIntToScalar(50), SkIntToScalar(50), radius);
     23             fPath.addCircle(SkIntToScalar(100), SkIntToScalar(100), radius);
     24         }
     25     }
     26 
     27 protected:
     28 
     29     SkString onShortName() override {
     30         return SkString("filltypespersp");
     31     }
     32 
     33     SkISize onISize() override {
     34         return SkISize::Make(835, 840);
     35     }
     36 
     37     void showPath(SkCanvas* canvas, int x, int y, SkPath::FillType ft,
     38                   SkScalar scale, const SkPaint& paint) {
     39         const SkRect r = { 0, 0, SkIntToScalar(150), SkIntToScalar(150) };
     40 
     41         canvas->save();
     42         canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
     43         canvas->clipRect(r);
     44         canvas->drawColor(SK_ColorWHITE);
     45         fPath.setFillType(ft);
     46         canvas->translate(r.centerX(), r.centerY());
     47         canvas->scale(scale, scale);
     48         canvas->translate(-r.centerX(), -r.centerY());
     49         canvas->drawPath(fPath, paint);
     50         canvas->restore();
     51     }
     52 
     53     void showFour(SkCanvas* canvas, SkScalar scale, bool aa) {
     54         SkPaint paint;
     55         SkPoint center = SkPoint::Make(SkIntToScalar(100), SkIntToScalar(100));
     56         SkColor colors[] = {SK_ColorBLUE, SK_ColorRED, SK_ColorGREEN};
     57         SkScalar pos[] = {0, SK_ScalarHalf, SK_Scalar1};
     58         paint.setShader(SkGradientShader::MakeRadial(center,
     59                                                      SkIntToScalar(100),
     60                                                      colors,
     61                                                      pos,
     62                                                      SK_ARRAY_COUNT(colors),
     63                                                      SkShader::kClamp_TileMode));
     64         paint.setAntiAlias(aa);
     65 
     66         showPath(canvas,   0,   0, SkPath::kWinding_FillType,
     67                  scale, paint);
     68         showPath(canvas, 200,   0, SkPath::kEvenOdd_FillType,
     69                  scale, paint);
     70         showPath(canvas,  00, 200, SkPath::kInverseWinding_FillType,
     71                  scale, paint);
     72         showPath(canvas, 200, 200, SkPath::kInverseEvenOdd_FillType,
     73                  scale, paint);
     74     }
     75 
     76     void onDraw(SkCanvas* canvas) override {
     77         this->makePath();
     78 
     79         // do perspective drawPaint as the background;
     80         SkPaint bkgnrd;
     81         SkPoint center = SkPoint::Make(SkIntToScalar(100),
     82                                        SkIntToScalar(100));
     83         SkColor colors[] = {SK_ColorBLACK, SK_ColorCYAN,
     84                             SK_ColorYELLOW, SK_ColorWHITE};
     85         SkScalar pos[] = {0, SK_ScalarHalf / 2,
     86                           3 * SK_ScalarHalf / 2, SK_Scalar1};
     87         bkgnrd.setShader(SkGradientShader::MakeRadial(center,
     88                                                       SkIntToScalar(1000),
     89                                                       colors,
     90                                                       pos,
     91                                                       SK_ARRAY_COUNT(colors),
     92                                                       SkShader::kClamp_TileMode));
     93         canvas->save();
     94             canvas->translate(SkIntToScalar(100), SkIntToScalar(100));
     95             SkMatrix mat;
     96             mat.reset();
     97             mat.setPerspY(SK_Scalar1 / 1000);
     98             canvas->concat(mat);
     99             canvas->drawPaint(bkgnrd);
    100         canvas->restore();
    101 
    102         // draw the paths in perspective
    103         SkMatrix persp;
    104         persp.reset();
    105         persp.setPerspX(-SK_Scalar1 / 1800);
    106         persp.setPerspY(SK_Scalar1 / 500);
    107         canvas->concat(persp);
    108 
    109         canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
    110         const SkScalar scale = SkIntToScalar(5)/4;
    111 
    112         showFour(canvas, SK_Scalar1, false);
    113         canvas->translate(SkIntToScalar(450), 0);
    114         showFour(canvas, scale, false);
    115 
    116         canvas->translate(SkIntToScalar(-450), SkIntToScalar(450));
    117         showFour(canvas, SK_Scalar1, true);
    118         canvas->translate(SkIntToScalar(450), 0);
    119         showFour(canvas, scale, true);
    120     }
    121 
    122 private:
    123     typedef GM INHERITED;
    124 };
    125 
    126 //////////////////////////////////////////////////////////////////////////////
    127 
    128 DEF_GM( return new FillTypePerspGM; )
    129 
    130 }
    131