gm/strokerects.cpp

   1 /*
   2  * Copyright 2011 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
   9
  10 #include "gm.h"
  11 #include "SkRandom.h"
  12
  13 namespace skiagm {
  14
  15 #define W   400
  16 #define H   400
  17 #define N   100
  18
  19 constexpr SkScalar SW = SkIntToScalar(W);
  20 constexpr SkScalar SH = SkIntToScalar(H);
  21
  22 class StrokeRectsGM : public GM {
  23 public:
  24     StrokeRectsGM() {}
  25
  26 protected:
  27
  28     SkString onShortName() override {
  29         return SkString("strokerects");
  30     }
  31
  32     SkISize onISize() override {
  33         return SkISize::Make(W*2, H*2);
  34     }
  35
  36     static void rnd_rect(SkRect* r, SkRandom& rand) {
  37         SkScalar x = rand.nextUScalar1() * W;
  38         SkScalar y = rand.nextUScalar1() * H;
  39         SkScalar w = rand.nextUScalar1() * (W >> 2);
  40         SkScalar h = rand.nextUScalar1() * (H >> 2);
  41         SkScalar hoffset = rand.nextSScalar1();
  42         SkScalar woffset = rand.nextSScalar1();
  43
  44         r->set(x, y, x + w, y + h);
  45         r->offset(-w/2 + woffset, -h/2 + hoffset);
  46     }
  47
  48     void onDraw(SkCanvas* canvas) override {
  49         SkPaint paint;
  50         paint.setStyle(SkPaint::kStroke_Style);
  51
  52         for (int y = 0; y < 2; y++) {
  53             paint.setAntiAlias(!!y);
  54             for (int x = 0; x < 2; x++) {
  55                 paint.setStrokeWidth(x * SkIntToScalar(3));
  56
  57                 SkAutoCanvasRestore acr(canvas, true);
  58                 canvas->translate(SW * x, SH * y);
  59                 canvas->clipRect(SkRect::MakeLTRB(
  60                         SkIntToScalar(2), SkIntToScalar(2)
  61                         , SW - SkIntToScalar(2), SH - SkIntToScalar(2)
  62                 ));
  63
  64                 SkRandom rand;
  65                 for (int i = 0; i < N; i++) {
  66                     SkRect r;
  67                     rnd_rect(&r, rand);
  68                     canvas->drawRect(r, paint);
  69                 }
  70             }
  71         }
  72     }
  73
  74 private:
  75     typedef GM INHERITED;
  76 };
  77
  78 //////////////////////////////////////////////////////////////////////////////
  79
  80 static GM* MyFactory(void*) { return new StrokeRectsGM; }
  81 static GMRegistry reg(MyFactory);
  82
  83 }