gm/hittestpath.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 #include "gm.h"
   9 #include "SkCanvas.h"
  10 #include "SkCullPoints.h"
  11 #include "SkRandom.h"
  12
  13 static void test_hittest(SkCanvas* canvas, const SkPath& path) {
  14     SkPaint paint;
  15     SkRect r = path.getBounds();
  16
  17     paint.setColor(SK_ColorRED);
  18     canvas->drawPath(path, paint);
  19
  20     const SkScalar MARGIN = SkIntToScalar(4);
  21
  22     paint.setColor(0x800000FF);
  23     for (SkScalar y = r.fTop + SK_ScalarHalf - MARGIN; y < r.fBottom + MARGIN; y += SK_Scalar1) {
  24         for (SkScalar x = r.fLeft + SK_ScalarHalf - MARGIN; x < r.fRight + MARGIN; x += SK_Scalar1) {
  25             if (path.contains(x, y)) {
  26                 canvas->drawPoint(x, y, paint);
  27             }
  28         }
  29     }
  30 }
  31
  32 class HitTestPathGM : public skiagm::GM {
  33 public:
  34     HitTestPathGM () {}
  35
  36 protected:
  37
  38     SkString onShortName() SK_OVERRIDE {
  39         return SkString("hittestpath");
  40     }
  41
  42     SkISize onISize() SK_OVERRIDE { return SkISize::Make(700, 460); }
  43
  44     void onDraw(SkCanvas* canvas) SK_OVERRIDE {
  45         SkPath path;
  46         SkRandom rand;
  47
  48         int scale = 300;
  49         for (int i = 0; i < 4; ++i) {
  50             path.lineTo(rand.nextUScalar1() * scale, rand.nextUScalar1() * scale);
  51             path.quadTo(rand.nextUScalar1() * scale, rand.nextUScalar1() * scale,
  52                         rand.nextUScalar1() * scale, rand.nextUScalar1() * scale);
  53             path.cubicTo(rand.nextUScalar1() * scale, rand.nextUScalar1() * scale,
  54                          rand.nextUScalar1() * scale, rand.nextUScalar1() * scale,
  55                          rand.nextUScalar1() * scale, rand.nextUScalar1() * scale);
  56         }
  57
  58         path.setFillType(SkPath::kEvenOdd_FillType);
  59         path.offset(SkIntToScalar(20), SkIntToScalar(20));
  60
  61         test_hittest(canvas, path);
  62
  63         canvas->translate(SkIntToScalar(scale), 0);
  64         path.setFillType(SkPath::kWinding_FillType);
  65
  66         test_hittest(canvas, path);
  67     }
  68
  69 private:
  70     typedef GM INHERITED;
  71 };
  72
  73 //////////////////////////////////////////////////////////////////////////////
  74
  75 static skiagm::GM* MyFactory(void*) { return new HitTestPathGM; }
  76 static skiagm::GMRegistry reg(MyFactory);