gm/thinstrokedrects.cpp

   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
  10 namespace skiagm {
  11
  12 // Draw rects with various stroke widths at 1/8 pixel increments
  13 class ThinStrokedRectsGM : public GM {
  14 public:
  15     ThinStrokedRectsGM() {
  16         this->setBGColor(0xFF000000);
  17     }
  18
  19 protected:
  20     SkString onShortName() override {
  21         return SkString("thinstrokedrects");
  22     }
  23
  24     SkISize onISize() override {
  25         return SkISize::Make(240, 320);
  26     }
  27
  28     void onDraw(SkCanvas* canvas) override {
  29
  30         SkPaint paint;
  31         paint.setColor(SK_ColorWHITE);
  32         paint.setStyle(SkPaint::kStroke_Style);
  33         paint.setAntiAlias(true);
  34
  35         constexpr SkRect rect = { 0, 0, 10, 10 };
  36         constexpr SkRect rect2 = { 0, 0, 20, 20 };
  37
  38         constexpr SkScalar gStrokeWidths[] = {
  39             4, 2, 1, 0.5f, 0.25f, 0.125f, 0
  40         };
  41
  42         canvas->translate(5, 5);
  43         for (int i = 0; i < 8; ++i) {
  44             canvas->save();
  45             canvas->translate(i*0.125f, i*30.0f);
  46             for (size_t j = 0; j < SK_ARRAY_COUNT(gStrokeWidths); ++j) {
  47                 paint.setStrokeWidth(gStrokeWidths[j]);
  48                 canvas->drawRect(rect, paint);
  49                 canvas->translate(15, 0);
  50             }
  51             canvas->restore();
  52         }
  53
  54         // Draw a second time in red with a scale
  55         paint.setColor(SK_ColorRED);
  56         canvas->translate(0, 15);
  57         for (int i = 0; i < 8; ++i) {
  58             canvas->save();
  59             canvas->translate(i*0.125f, i*30.0f);
  60             canvas->scale(0.5f, 0.5f);
  61             for (size_t j = 0; j < SK_ARRAY_COUNT(gStrokeWidths); ++j) {
  62                 paint.setStrokeWidth(2.0f * gStrokeWidths[j]);
  63                 canvas->drawRect(rect2, paint);
  64                 canvas->translate(30, 0);
  65             }
  66             canvas->restore();
  67         }
  68     }
  69
  70 private:
  71     typedef GM INHERITED;
  72 };
  73
  74 //////////////////////////////////////////////////////////////////////////////
  75
  76 DEF_GM(return new ThinStrokedRectsGM;)
  77 }