Home | History | Annotate | Download | only in gm 
      1 /*
      2  * Copyright 2015 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 "SkRRect.h"
     11 #include "SkPath.h"
     12 
     13 class ScaledStrokesGM : public skiagm::GM {
     14 public:
     15     ScaledStrokesGM() {}
     16 
     17 protected:
     18 
     19     SkString onShortName() override {
     20         return SkString("scaledstrokes");
     21     }
     22 
     23     SkISize onISize() override {
     24         return SkISize::Make(640, 320);
     25     }
     26 
     27     static void draw_path(SkScalar size, SkCanvas* canvas, SkPaint paint) {
     28         SkScalar c = 0.551915024494f * size;
     29         SkPath path;
     30         path.moveTo(0.0f, size);
     31         path.cubicTo(c, size, size, c, size, 0.0f);
     32         path.cubicTo(size, -c, c, -size, 0.0f, -size);
     33         path.cubicTo(-c, -size, -size, -c, -size, 0.0f);
     34         path.cubicTo(-size, c, -c, size, 0.0f, size);
     35         canvas->drawPath(path, paint);
     36     }
     37 
     38     void onDraw(SkCanvas* canvas) override {
     39         SkPaint paint;
     40         SkPath path;
     41         paint.setStyle(SkPaint::Style::kStroke_Style);
     42         canvas->translate(5.0f, 5.0f);
     43         const SkScalar size = 60.0f;
     44         for (int i = 0; i < 2; i++) {
     45             paint.setAntiAlias(i == 1);
     46             for (int j = 0; j < 4; j++) {
     47                 SkScalar scale = 4.0f - j;
     48                 paint.setStrokeWidth(4.0f / scale);
     49                 canvas->save();
     50                 canvas->translate(size / 2.0f, size / 2.0f);
     51                 canvas->scale(scale, scale);
     52                 draw_path(size / 2.0f / scale, canvas, paint);
     53                 canvas->restore();
     54 
     55                 canvas->save();
     56                 canvas->translate(size / 2.0f, 80.0f + size / 2.0f);
     57                 canvas->scale(scale, scale);
     58                 canvas->drawCircle(0.0f, 0.0f, size / 2.0f / scale, paint);
     59                 canvas->restore();
     60 
     61                 canvas->save();
     62                 canvas->translate(0.0f, 160.0f);
     63                 canvas->scale(scale, scale);
     64                 canvas->drawRect(SkRect::MakeXYWH(0.0f, 0.0f, size / scale, size / scale), paint);
     65                 canvas->restore();
     66 
     67                 canvas->save();
     68                 canvas->translate(0.0f, 240.0f);
     69                 canvas->scale(scale, scale);
     70                 canvas->drawLine(0.0f, 0.0f, size / scale, size / scale, paint);
     71                 canvas->restore();
     72 
     73                 canvas->translate(80.0f, 0.0f);
     74             }
     75         }
     76 
     77     }
     78 
     79 private:
     80     typedef GM INHERITED;
     81 };
     82 
     83 DEF_GM( return new ScaledStrokesGM; )
     84