Flutter Engine
The Flutter Engine
points.cpp
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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"
15#include "include/core/SkSize.h"
17#include "src/base/SkRandom.h"
18
19#include <stddef.h>
20
21namespace skiagm {
22
23class PointsGM : public GM {
24public:
26
27protected:
28 SkString getName() const override { return SkString("points"); }
29
30 SkISize getISize() override { return SkISize::Make(640, 490); }
31
32 static void fill_pts(SkPoint pts[], size_t n, SkRandom* rand) {
33 for (size_t i = 0; i < n; i++) {
34 // Compute these independently and store in variables, rather
35 // than in the parameter-passing expression, to get consistent
36 // evaluation order across compilers.
37 SkScalar y = rand->nextUScalar1() * 480;
38 SkScalar x = rand->nextUScalar1() * 640;
39 pts[i].set(x, y);
40 }
41 }
42
43 void onDraw(SkCanvas* canvas) override {
45
46 SkRandom rand;
47 SkPaint p0, p1, p2, p3;
48 const size_t n = 99;
49
54
58
59 SkPoint* pts = new SkPoint[n];
60 fill_pts(pts, n, &rand);
61
62 canvas->drawPoints(SkCanvas::kPolygon_PointMode, n, pts, p0);
63 canvas->drawPoints(SkCanvas::kLines_PointMode, n, pts, p1);
64 canvas->drawPoints(SkCanvas::kPoints_PointMode, n, pts, p2);
65 canvas->drawPoints(SkCanvas::kPoints_PointMode, n, pts, p3);
66
67 delete[] pts;
68 }
69
70private:
71 using INHERITED = GM;
72};
73DEF_GM( return new PointsGM; )
74} // namespace skiagm
75
77
78DEF_SIMPLE_GM(points_maskfilter, canvas, 512, 256) {
79 constexpr int N = 30;
80 SkPoint pts[N];
81
82 SkRandom rand;
83 for (SkPoint& p : pts) {
84 p.fX = rand.nextF() * 220 + 18;
85 p.fY = rand.nextF() * 220 + 18;
86 }
87
90
92 paint.setAntiAlias(true);
93 paint.setStroke(true);
94 paint.setStrokeWidth(10);
95
96 for (auto cap : caps) {
97 paint.setStrokeCap(cap);
98
99 paint.setMaskFilter(mf);
100 paint.setColor(SK_ColorBLACK);
101 canvas->drawPoints(SkCanvas::kPoints_PointMode, N, pts, paint);
102
103 paint.setMaskFilter(nullptr);
104 paint.setColor(SK_ColorRED);
105 canvas->drawPoints(SkCanvas::kPoints_PointMode, N, pts, paint);
106
107 canvas->translate(256, 0);
108 }
109}
@ kNormal_SkBlurStyle
fuzzy inside and outside
Definition: SkBlurTypes.h:12
constexpr SkColor SK_ColorBLUE
Definition: SkColor.h:135
constexpr SkColor SK_ColorRED
Definition: SkColor.h:126
constexpr SkColor SK_ColorBLACK
Definition: SkColor.h:103
constexpr SkColor SK_ColorGREEN
Definition: SkColor.h:131
constexpr SkColor SK_ColorWHITE
Definition: SkColor.h:122
#define SK_Scalar1
Definition: SkScalar.h:18
#define SkIntToScalar(x)
Definition: SkScalar.h:57
#define N
Definition: beziers.cpp:19
void drawPoints(PointMode mode, size_t count, const SkPoint pts[], const SkPaint &paint)
Definition: SkCanvas.cpp:1710
void translate(SkScalar dx, SkScalar dy)
Definition: SkCanvas.cpp:1278
@ kLines_PointMode
draw each pair of points as a line segment
Definition: SkCanvas.h:1242
@ kPolygon_PointMode
draw the array of points as a open polygon
Definition: SkCanvas.h:1243
@ kPoints_PointMode
draw each point separately
Definition: SkCanvas.h:1241
static sk_sp< SkMaskFilter > MakeBlur(SkBlurStyle style, SkScalar sigma, bool respectCTM=true)
@ kRound_Cap
adds circle
Definition: SkPaint.h:335
@ kSquare_Cap
adds square
Definition: SkPaint.h:336
void setColor(SkColor color)
Definition: SkPaint.cpp:119
void setStrokeCap(Cap cap)
Definition: SkPaint.cpp:179
void setStrokeWidth(SkScalar width)
Definition: SkPaint.cpp:159
float nextF()
Definition: SkRandom.h:55
SkScalar nextUScalar1()
Definition: SkRandom.h:101
Definition: gm.h:110
GM(SkColor backgroundColor=SK_ColorWHITE)
Definition: gm.cpp:81
static void fill_pts(SkPoint pts[], size_t n, SkRandom *rand)
Definition: points.cpp:32
void onDraw(SkCanvas *canvas) override
Definition: points.cpp:43
SkISize getISize() override
Definition: points.cpp:30
SkString getName() const override
Definition: points.cpp:28
const Paint & paint
Definition: color_source.cc:38
float SkScalar
Definition: extension.cpp:12
double y
double x
DEF_GM(return F(C(clipbox), 0.0f, 0.0f, {})) DEF_GM(return F(C(clipbox)
DEF_SIMPLE_GM(points_maskfilter, canvas, 512, 256)
Definition: points.cpp:78
Definition: SkSize.h:16
static constexpr SkISize Make(int32_t w, int32_t h)
Definition: SkSize.h:20
void set(float x, float y)
Definition: SkPoint_impl.h:200