gm/stlouisarch.cpp

   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 "SkPath.h"
  11 #include "SkTArray.h"
  12
  13 namespace skiagm {
  14
  15 // this GM tests hairlines which fill nearly the entire render target
  16 class StLouisArchGM : public GM {
  17 protected:
  18     SkString onShortName() override {
  19         return SkString("stlouisarch");
  20     }
  21
  22     SkISize onISize() override { return SkISize::Make((int)kWidth, (int)kHeight); }
  23
  24     void onOnceBeforeDraw() override {
  25         {
  26             SkPath* bigQuad = &fPaths.push_back();
  27             bigQuad->moveTo(0, 0);
  28             bigQuad->quadTo(kWidth/2, kHeight, kWidth, 0);
  29         }
  30
  31         {
  32             SkPath* degenBigQuad = &fPaths.push_back();
  33             SkScalar yPos = kHeight / 2 + 10;
  34             degenBigQuad->moveTo(0, yPos);
  35             degenBigQuad->quadTo(0, yPos, kWidth, yPos);
  36         }
  37
  38
  39         {
  40             SkPath* bigCubic = &fPaths.push_back();
  41             bigCubic->moveTo(0, 0);
  42             bigCubic->cubicTo(0, kHeight,
  43                               kWidth, kHeight,
  44                               kWidth, 0);
  45         }
  46
  47         {
  48             SkPath* degenBigCubic = &fPaths.push_back();
  49             SkScalar yPos = kHeight / 2;
  50             degenBigCubic->moveTo(0, yPos);
  51             degenBigCubic->cubicTo(0, yPos,
  52                                    0, yPos,
  53                                    kWidth, yPos);
  54         }
  55
  56         {
  57             SkPath* bigConic = &fPaths.push_back();
  58             bigConic->moveTo(0, 0);
  59             bigConic->conicTo(kWidth/2, kHeight, kWidth, 0, .5);
  60         }
  61
  62         {
  63             SkPath* degenBigConic = &fPaths.push_back();
  64             SkScalar yPos = kHeight / 2 - 10;
  65             degenBigConic->moveTo(0, yPos);
  66             degenBigConic->conicTo(0, yPos, kWidth, yPos, .5);
  67         }
  68     }
  69
  70     void onDraw(SkCanvas* canvas) override {
  71         canvas->save();
  72         canvas->scale(1, -1);
  73         canvas->translate(0, -kHeight);
  74         for (int p = 0; p < fPaths.count(); ++p) {
  75             SkPaint paint;
  76             paint.setARGB(0xff, 0, 0, 0);
  77             paint.setAntiAlias(true);
  78             paint.setStyle(SkPaint::kStroke_Style);
  79             paint.setStrokeWidth(0);
  80             canvas->drawPath(fPaths[p], paint);
  81         }
  82         canvas->restore();
  83     }
  84
  85     const SkScalar kWidth = 256;
  86     const SkScalar kHeight = 256;
  87
  88 private:
  89     SkTArray<SkPath> fPaths;
  90     typedef GM INHERITED;
  91 };
  92
  93 //////////////////////////////////////////////////////////////////////////////
  94
  95 static GM* MyFactory(void*) { return new StLouisArchGM; }
  96 static GMRegistry reg(MyFactory);
  97
  98 }