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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 "SkCanvas.h"
     10 #include "SkPath.h"
     11 
     12 // Reproduces https://code.google.com/p/chromium/issues/detail?id=279014
     13 
     14 static const int kWidth = 640;
     15 static const int kHeight = 480;
     16 static const SkScalar kAngle = 0.305f;
     17 
     18 // Renders a string art shape.
     19 // The particular shape rendered can be controlled by adjusting kAngle, from 0 to 1
     20 
     21 class StringArtGM : public skiagm::GM {
     22 public:
     23     StringArtGM() {}
     24 
     25 protected:
     26     virtual uint32_t onGetFlags() const SK_OVERRIDE {
     27         return kSkipTiled_Flag;
     28     }
     29 
     30     virtual SkString onShortName() {
     31         return SkString("stringart");
     32     }
     33 
     34     virtual SkISize onISize() {
     35         return SkISize::Make(kWidth, kHeight);
     36     }
     37 
     38     virtual void onDraw(SkCanvas* canvas) {
     39         SkScalar angle = kAngle*SK_ScalarPI + SkScalarHalf(SK_ScalarPI);
     40         SkScalar size = SkIntToScalar(SkMin32(kWidth, kHeight));
     41         SkPoint center = SkPoint::Make(SkScalarHalf(kWidth), SkScalarHalf(kHeight));
     42         SkScalar length = 5;
     43         SkScalar step = angle;
     44 
     45         SkPath path;
     46         path.moveTo(center);
     47 
     48         while (length < (SkScalarHalf(size) - 10.f))
     49         {
     50             SkPoint rp = SkPoint::Make(length*SkScalarCos(step) + center.fX,
     51                                        length*SkScalarSin(step) + center.fY);
     52             path.lineTo(rp);
     53             length += SkScalarDiv(angle, SkScalarHalf(SK_ScalarPI));
     54             step += angle;
     55         }
     56         path.close();
     57 
     58         SkPaint paint;
     59         paint.setAntiAlias(true);
     60         paint.setStyle(SkPaint::kStroke_Style);
     61         paint.setColor(0xFF007700);
     62 
     63         canvas->drawPath(path, paint);
     64     }
     65 
     66 private:
     67     typedef GM INHERITED;
     68 };
     69 
     70 DEF_GM( return new StringArtGM; )
     71