submodule/skia/gm/points.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/gm.h"
   9 #include "include/core/SkCanvas.h"
  10 #include "include/core/SkColor.h"
  11 #include "include/core/SkPaint.h"
  12 #include "include/core/SkPoint.h"
  13 #include "include/core/SkScalar.h"
  14 #include "include/core/SkSize.h"
  15 #include "include/core/SkString.h"
  16 #include "include/utils/SkRandom.h"
  17
  18 #include <stddef.h>
  19
  20 namespace skiagm {
  21
  22 class PointsGM : public GM {
  23 public:
  24     PointsGM() {}
  25
  26 protected:
  27
  28     SkString onShortName() override {
  29         return SkString("points");
  30     }
  31
  32     SkISize onISize() override {
  33         return SkISize::Make(640, 490);
  34     }
  35
  36     static void fill_pts(SkPoint pts[], size_t n, SkRandom* rand) {
  37         for (size_t i = 0; i < n; i++) {
  38             // Compute these independently and store in variables, rather
  39             // than in the parameter-passing expression, to get consistent
  40             // evaluation order across compilers.
  41             SkScalar y = rand->nextUScalar1() * 480;
  42             SkScalar x = rand->nextUScalar1() * 640;
  43             pts[i].set(x, y);
  44         }
  45     }
  46
  47     void onDraw(SkCanvas* canvas) override {
  48         canvas->translate(SK_Scalar1, SK_Scalar1);
  49
  50         SkRandom rand;
  51         SkPaint  p0, p1, p2, p3;
  52         const size_t n = 99;
  53
  54         p0.setColor(SK_ColorRED);
  55         p1.setColor(SK_ColorGREEN);
  56         p2.setColor(SK_ColorBLUE);
  57         p3.setColor(SK_ColorWHITE);
  58
  59         p0.setStrokeWidth(SkIntToScalar(4));
  60         p2.setStrokeCap(SkPaint::kRound_Cap);
  61         p2.setStrokeWidth(SkIntToScalar(6));
  62
  63         SkPoint* pts = new SkPoint[n];
  64         fill_pts(pts, n, &rand);
  65
  66         canvas->drawPoints(SkCanvas::kPolygon_PointMode, n, pts, p0);
  67         canvas->drawPoints(SkCanvas::kLines_PointMode, n, pts, p1);
  68         canvas->drawPoints(SkCanvas::kPoints_PointMode, n, pts, p2);
  69         canvas->drawPoints(SkCanvas::kPoints_PointMode, n, pts, p3);
  70
  71         delete[] pts;
  72     }
  73
  74 private:
  75     using INHERITED = GM;
  76 };
  77 DEF_GM( return new PointsGM; )
  78 }  // namespace skiagm
  79
  80 #include "include/core/SkMaskFilter.h"
  81
  82 DEF_SIMPLE_GM(points_maskfilter, canvas, 512, 256) {
  83     constexpr int N = 30;
  84     SkPoint pts[N];
  85
  86     SkRandom rand;
  87     for (SkPoint& p : pts) {
  88         p.fX = rand.nextF() * 220 + 18;
  89         p.fY = rand.nextF() * 220 + 18;
  90     }
  91
  92     auto mf = SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, 6);
  93     const SkPaint::Cap caps[] = { SkPaint::kSquare_Cap, SkPaint::kRound_Cap };
  94
  95     SkPaint paint;
  96     paint.setAntiAlias(true);
  97     paint.setStroke(true);
  98     paint.setStrokeWidth(10);
  99
 100     for (auto cap : caps) {
 101         paint.setStrokeCap(cap);
 102
 103         paint.setMaskFilter(mf);
 104         paint.setColor(SK_ColorBLACK);
 105         canvas->drawPoints(SkCanvas::kPoints_PointMode, N, pts, paint);
 106
 107         paint.setMaskFilter(nullptr);
 108         paint.setColor(SK_ColorRED);
 109         canvas->drawPoints(SkCanvas::kPoints_PointMode, N, pts, paint);
 110
 111         canvas->translate(256, 0);
 112     }
 113 }