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      1 /*
      2  * Copyright 2013 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 "SkRandom.h"
     10 
     11 namespace skiagm {
     12 
     13 // This GM draws a lot of arcs in a 'Z' shape. It particularly exercises
     14 // the 'drawArc' code near a singularly of its processing (i.e., near the
     15 // edge of one of its underlying quads).
     16 class ArcOfZorroGM : public GM {
     17 public:
     18     ArcOfZorroGM() {
     19         this->setBGColor(0xFFCCCCCC);
     20     }
     21 
     22 protected:
     23     virtual SkString onShortName() SK_OVERRIDE {
     24         return SkString("arcofzorro");
     25     }
     26 
     27     virtual SkISize onISize() SK_OVERRIDE {
     28         return make_isize(1000, 1000);
     29     }
     30 
     31     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
     32         SkRandom rand;
     33 
     34         SkRect rect = SkRect::MakeXYWH(10, 10, 200, 200);
     35 
     36         SkPaint p;
     37 
     38         p.setStyle(SkPaint::kStroke_Style);
     39         p.setStrokeWidth(35);
     40         int xOffset = 0, yOffset = 0;
     41         int direction = 0;
     42 
     43         for (float arc = 134.0f; arc < 136.0f; arc += 0.01f) {
     44             SkColor color = rand.nextU();
     45             color |= 0xff000000;
     46             p.setColor(color);
     47 
     48             canvas->save();
     49             canvas->translate(SkIntToScalar(xOffset), SkIntToScalar(yOffset));
     50             canvas->drawArc(rect, 0, arc, false, p);
     51             canvas->restore();
     52 
     53             switch (direction) {
     54             case 0:
     55                 xOffset += 10;
     56                 if (xOffset >= 700) {
     57                     direction = 1;
     58                 }
     59                 break;
     60             case 1:
     61                 xOffset -= 10;
     62                 yOffset += 10;
     63                 if (xOffset < 50) {
     64                     direction = 2;
     65                 }
     66                 break;
     67             case 2:
     68                 xOffset += 10;
     69                 break;
     70             }
     71         }
     72 
     73     }
     74 
     75 private:
     76     typedef GM INHERITED;
     77 };
     78 
     79 //////////////////////////////////////////////////////////////////////////////
     80 
     81 DEF_GM( return SkNEW(ArcOfZorroGM); )
     82 
     83 }
     84