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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 "sk_tool_utils.h"
     10 #include "SkRandom.h"
     11 
     12 namespace skiagm {
     13 
     14 // This GM draws a lot of arcs in a 'Z' shape. It particularly exercises
     15 // the 'drawArc' code near a singularly of its processing (i.e., near the
     16 // edge of one of its underlying quads).
     17 class ArcOfZorroGM : public GM {
     18 public:
     19     ArcOfZorroGM() {
     20         this->setBGColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
     21     }
     22 
     23 protected:
     24 
     25     SkString onShortName() override {
     26         return SkString("arcofzorro");
     27     }
     28 
     29     SkISize onISize() override {
     30         return SkISize::Make(1000, 1000);
     31     }
     32 
     33     void onDraw(SkCanvas* canvas) override {
     34         SkRandom rand;
     35 
     36         SkRect rect = SkRect::MakeXYWH(10, 10, 200, 200);
     37 
     38         SkPaint p;
     39 
     40         p.setStyle(SkPaint::kStroke_Style);
     41         p.setStrokeWidth(35);
     42         int xOffset = 0, yOffset = 0;
     43         int direction = 0;
     44 
     45         for (float arc = 134.0f; arc < 136.0f; arc += 0.01f) {
     46             SkColor color = rand.nextU();
     47             color |= 0xff000000;
     48             p.setColor(color);
     49 
     50             canvas->save();
     51             canvas->translate(SkIntToScalar(xOffset), SkIntToScalar(yOffset));
     52             canvas->drawArc(rect, 0, arc, false, p);
     53             canvas->restore();
     54 
     55             switch (direction) {
     56             case 0:
     57                 xOffset += 10;
     58                 if (xOffset >= 700) {
     59                     direction = 1;
     60                 }
     61                 break;
     62             case 1:
     63                 xOffset -= 10;
     64                 yOffset += 10;
     65                 if (xOffset < 50) {
     66                     direction = 2;
     67                 }
     68                 break;
     69             case 2:
     70                 xOffset += 10;
     71                 break;
     72             }
     73         }
     74 
     75     }
     76 
     77 private:
     78     typedef GM INHERITED;
     79 };
     80 
     81 //////////////////////////////////////////////////////////////////////////////
     82 
     83 DEF_GM(return new ArcOfZorroGM;)
     84 }
     85