blob: 2f1f0260c930a4a6df3c359368123a077d25b1e2 [file] [log] [blame]
reed@google.com35a81df2012-05-04 21:49:27 +00001/*
2 * Copyright 2012 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 "SkPaint.h"
11#include "SkDashPathEffect.h"
12
reed@google.comde1837b2012-05-21 16:47:43 +000013static void drawline(SkCanvas* canvas, int on, int off, const SkPaint& paint,
14 SkScalar finalX = SkIntToScalar(600)) {
reed@google.com35a81df2012-05-04 21:49:27 +000015 SkPaint p(paint);
16
17 const SkScalar intervals[] = {
18 SkIntToScalar(on),
19 SkIntToScalar(off),
20 };
21
22 p.setPathEffect(new SkDashPathEffect(intervals, 2, 0))->unref();
reed@google.comde1837b2012-05-21 16:47:43 +000023 canvas->drawLine(0, 0, finalX, 0, p);
24}
25
26// earlier bug stopped us from drawing very long single-segment dashes, because
27// SkPathMeasure was skipping very small delta-T values (nearlyzero). This is
28// now fixes, so this giant dash should appear.
29static void show_giant_dash(SkCanvas* canvas) {
30 SkPaint paint;
31
32 drawline(canvas, 1, 1, paint, SkIntToScalar(20 * 1000));
reed@google.com35a81df2012-05-04 21:49:27 +000033}
34
reed@google.com21384df2012-05-18 17:59:08 +000035class DashingGM : public skiagm::GM {
reed@google.com35a81df2012-05-04 21:49:27 +000036public:
37 DashingGM() {}
38
39protected:
40 SkString onShortName() {
41 return SkString("dashing");
42 }
43
reed@google.com21384df2012-05-18 17:59:08 +000044 SkISize onISize() { return skiagm::make_isize(640, 300); }
reed@google.com35a81df2012-05-04 21:49:27 +000045
46 virtual void onDraw(SkCanvas* canvas) {
47 static const struct {
48 int fOnInterval;
49 int fOffInterval;
50 } gData[] = {
51 { 1, 1 },
52 { 4, 1 },
53 };
rmistry@google.comae933ce2012-08-23 18:19:56 +000054
reed@google.com35a81df2012-05-04 21:49:27 +000055 SkPaint paint;
56 paint.setStyle(SkPaint::kStroke_Style);
57
58 canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
59 canvas->translate(0, SK_ScalarHalf);
60
61 for (int width = 0; width <= 2; ++width) {
62 for (size_t data = 0; data < SK_ARRAY_COUNT(gData); ++data) {
63 for (int aa = 0; aa <= 1; ++aa) {
64 int w = width * width * width;
65 paint.setAntiAlias(SkToBool(aa));
66 paint.setStrokeWidth(SkIntToScalar(w));
rmistry@google.comae933ce2012-08-23 18:19:56 +000067
reed@google.com35a81df2012-05-04 21:49:27 +000068 int scale = w ? w : 1;
69
70 drawline(canvas, gData[data].fOnInterval * scale,
71 gData[data].fOffInterval * scale,
72 paint);
73 canvas->translate(0, SkIntToScalar(20));
74 }
75 }
76 }
rmistry@google.comae933ce2012-08-23 18:19:56 +000077
reed@google.comde1837b2012-05-21 16:47:43 +000078 show_giant_dash(canvas);
reed@google.com35a81df2012-05-04 21:49:27 +000079 }
reed@google.com21384df2012-05-18 17:59:08 +000080};
reed@google.com35a81df2012-05-04 21:49:27 +000081
reed@google.com21384df2012-05-18 17:59:08 +000082///////////////////////////////////////////////////////////////////////////////
83
84static void make_unit_star(SkPath* path, int n) {
85 SkScalar rad = -SK_ScalarPI / 2;
86 const SkScalar drad = (n >> 1) * SK_ScalarPI * 2 / n;
rmistry@google.comae933ce2012-08-23 18:19:56 +000087
reed@google.com21384df2012-05-18 17:59:08 +000088 path->moveTo(0, -SK_Scalar1);
89 for (int i = 1; i < n; i++) {
90 rad += drad;
91 SkScalar cosV, sinV = SkScalarSinCos(rad, &cosV);
92 path->lineTo(cosV, sinV);
93 }
94 path->close();
95}
96
97static void make_path_line(SkPath* path, const SkRect& bounds) {
98 path->moveTo(bounds.left(), bounds.top());
99 path->lineTo(bounds.right(), bounds.bottom());
100}
101
102static void make_path_rect(SkPath* path, const SkRect& bounds) {
103 path->addRect(bounds);
104}
105
106static void make_path_oval(SkPath* path, const SkRect& bounds) {
107 path->addOval(bounds);
108}
109
110static void make_path_star(SkPath* path, const SkRect& bounds) {
111 make_unit_star(path, 5);
112 SkMatrix matrix;
113 matrix.setRectToRect(path->getBounds(), bounds, SkMatrix::kCenter_ScaleToFit);
114 path->transform(matrix);
115}
116
117class Dashing2GM : public skiagm::GM {
118public:
119 Dashing2GM() {}
rmistry@google.comae933ce2012-08-23 18:19:56 +0000120
reed@google.com21384df2012-05-18 17:59:08 +0000121protected:
122 SkString onShortName() {
123 return SkString("dashing2");
124 }
rmistry@google.comae933ce2012-08-23 18:19:56 +0000125
reed@google.com21384df2012-05-18 17:59:08 +0000126 SkISize onISize() { return skiagm::make_isize(640, 480); }
rmistry@google.comae933ce2012-08-23 18:19:56 +0000127
reed@google.com21384df2012-05-18 17:59:08 +0000128 virtual void onDraw(SkCanvas* canvas) {
129 static const int gIntervals[] = {
130 3, // 3 dashes: each count [0] followed by intervals [1..count]
131 2, 10, 10,
132 4, 20, 5, 5, 5,
133 2, 2, 2
134 };
135
136 void (*gProc[])(SkPath*, const SkRect&) = {
137 make_path_line, make_path_rect, make_path_oval, make_path_star,
138 };
rmistry@google.comae933ce2012-08-23 18:19:56 +0000139
reed@google.com21384df2012-05-18 17:59:08 +0000140 SkPaint paint;
141 paint.setAntiAlias(true);
142 paint.setStyle(SkPaint::kStroke_Style);
143 paint.setStrokeWidth(SkIntToScalar(6));
rmistry@google.comae933ce2012-08-23 18:19:56 +0000144
reed@google.com21384df2012-05-18 17:59:08 +0000145 SkRect bounds = SkRect::MakeWH(SkIntToScalar(120), SkIntToScalar(120));
146 bounds.offset(SkIntToScalar(20), SkIntToScalar(20));
147 SkScalar dx = bounds.width() * 4 / 3;
148 SkScalar dy = bounds.height() * 4 / 3;
149
150 const int* intervals = &gIntervals[1];
151 for (int y = 0; y < gIntervals[0]; ++y) {
152 SkScalar vals[SK_ARRAY_COUNT(gIntervals)]; // more than enough
153 int count = *intervals++;
154 for (int i = 0; i < count; ++i) {
155 vals[i] = SkIntToScalar(*intervals++);
156 }
157 SkScalar phase = vals[0] / 2;
158 paint.setPathEffect(new SkDashPathEffect(vals, count, phase))->unref();
rmistry@google.comae933ce2012-08-23 18:19:56 +0000159
reed@google.com21384df2012-05-18 17:59:08 +0000160 for (size_t x = 0; x < SK_ARRAY_COUNT(gProc); ++x) {
161 SkPath path;
162 SkRect r = bounds;
163 r.offset(x * dx, y * dy);
164 gProc[x](&path, r);
rmistry@google.comae933ce2012-08-23 18:19:56 +0000165
reed@google.com21384df2012-05-18 17:59:08 +0000166 canvas->drawPath(path, paint);
167 }
168 }
169 }
reed@google.com35a81df2012-05-04 21:49:27 +0000170};
171
172//////////////////////////////////////////////////////////////////////////////
173
reed@google.com21384df2012-05-18 17:59:08 +0000174static skiagm::GM* F0(void*) { return new DashingGM; }
175static skiagm::GM* F1(void*) { return new Dashing2GM; }
reed@google.com35a81df2012-05-04 21:49:27 +0000176
reed@google.com21384df2012-05-18 17:59:08 +0000177static skiagm::GMRegistry gR0(F0);
178static skiagm::GMRegistry gR1(F1);
179