hstern | 9bd4c69 | 2016-06-15 09:13:34 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2016 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 | #include "SampleCode.h" |
| 8 | #include "SkView.h" |
| 9 | #include "SkCanvas.h" |
| 10 | #include "SkPath.h" |
| 11 | |
| 12 | #include <cmath> |
| 13 | |
| 14 | #define PI SK_ScalarPI |
| 15 | |
| 16 | #define LIN_SEGMENTS 10 |
| 17 | |
| 18 | class OverstrokeView : public SampleView { |
| 19 | public: |
| 20 | SkScalar fStroke; |
| 21 | int fPathType; // super lazy enum |
| 22 | bool fClosePath; |
| 23 | bool fDrawFillPath; |
| 24 | OverstrokeView() { |
| 25 | fStroke = 5; |
| 26 | fPathType = 0; |
| 27 | fClosePath = false; |
| 28 | fDrawFillPath = false; |
| 29 | this->setBGColor(0xFFFFFFFF); |
| 30 | } |
| 31 | |
| 32 | protected: |
| 33 | bool onQuery(SkEvent* evt) override { |
| 34 | if (SampleCode::TitleQ(*evt)) { |
| 35 | SampleCode::TitleR(evt, "PathOverstroke"); |
| 36 | return true; |
| 37 | } |
| 38 | SkUnichar uni; |
| 39 | if (SampleCode::CharQ(*evt, &uni)) { |
| 40 | switch (uni) { |
| 41 | case ',': |
| 42 | fStroke += 1.0; |
| 43 | this->inval(nullptr); |
| 44 | return true; |
| 45 | case '.': |
| 46 | fStroke -= 1.0; |
| 47 | this->inval(nullptr); |
| 48 | return true; |
| 49 | case 'x': |
| 50 | fPathType = (fPathType + 1) % 3; |
| 51 | this->inval(nullptr); |
| 52 | return true; |
| 53 | case 'c': |
| 54 | fClosePath = !fClosePath; |
| 55 | this->inval(nullptr); |
| 56 | return true; |
| 57 | case 'f': |
| 58 | fDrawFillPath = !fDrawFillPath; |
| 59 | this->inval(nullptr); |
| 60 | return true; |
| 61 | default: |
| 62 | break; |
| 63 | } |
| 64 | } |
| 65 | return this->INHERITED::onQuery(evt); |
| 66 | } |
| 67 | |
| 68 | SkPath quadPath(SkPoint p1, SkPoint p2) { |
| 69 | SkASSERT(p1.y() == p2.y()); |
| 70 | |
| 71 | SkPath path; |
| 72 | path.moveTo(p1); |
| 73 | path.lineTo(p2); |
| 74 | |
| 75 | SkPoint p3 = SkPoint::Make((p1.x() + p2.x()) / 2.0f, p1.y() * 0.7f); |
| 76 | |
| 77 | path.quadTo(p3, p1); |
| 78 | |
| 79 | return path; |
| 80 | } |
| 81 | |
| 82 | SkPath linSemicirclePath(SkPoint p1, SkPoint p2) { |
| 83 | SkASSERT(p1.y() == p2.y()); |
| 84 | |
| 85 | SkPath path; |
| 86 | path.moveTo(p1); |
| 87 | path.lineTo(p2); |
| 88 | |
| 89 | SkPoint pt; |
| 90 | |
| 91 | for (int i = 0; i < LIN_SEGMENTS; i++) { |
| 92 | float theta = i * PI / (LIN_SEGMENTS); |
| 93 | SkScalar x = 65 + 15 * cos(theta); |
| 94 | SkScalar y = 50 - 15 * sin(theta); |
| 95 | pt = SkPoint::Make(x, y); |
| 96 | path.lineTo(pt); |
| 97 | } |
| 98 | path.lineTo(p1); |
| 99 | |
| 100 | return path; |
| 101 | } |
| 102 | |
| 103 | SkPath rectPath(SkPoint p1) { |
| 104 | SkRect r = SkRect::MakeXYWH(p1.fX, p1.fY, 20, 20); |
| 105 | SkPath path; |
| 106 | path.addRect(r); |
| 107 | |
| 108 | return path; |
| 109 | } |
| 110 | |
| 111 | void onDrawContent(SkCanvas* canvas) override { |
| 112 | const float SCALE = 1; |
| 113 | |
| 114 | canvas->translate(30, 40); |
| 115 | canvas->scale(SCALE, SCALE); |
| 116 | |
| 117 | SkPoint p1 = SkPoint::Make(50, 50); |
| 118 | SkPoint p2 = SkPoint::Make(80, 50); |
| 119 | |
| 120 | SkPath path; |
| 121 | switch (fPathType) { |
| 122 | case 0: |
| 123 | path = quadPath(p1, p2); |
| 124 | break; |
| 125 | case 1: |
| 126 | path = linSemicirclePath(p1, p2); |
| 127 | break; |
| 128 | case 2: |
| 129 | path = rectPath(p1); |
| 130 | break; |
| 131 | default: |
| 132 | path = quadPath(p1, p2); |
| 133 | break; |
| 134 | } |
| 135 | |
| 136 | if (fClosePath) { |
| 137 | path.close(); |
| 138 | } |
| 139 | |
| 140 | SkPaint p; |
| 141 | p.setColor(SK_ColorRED); |
| 142 | p.setAntiAlias(true); |
| 143 | p.setStyle(SkPaint::kStroke_Style); |
| 144 | p.setStrokeWidth(fStroke); |
| 145 | |
| 146 | canvas->drawPath(path, p); |
| 147 | |
| 148 | if (fDrawFillPath) { |
| 149 | SkPath fillpath; |
| 150 | p.getFillPath(path, &fillpath); |
| 151 | |
| 152 | SkPaint fillp; |
| 153 | fillp.setColor(SK_ColorBLACK); |
| 154 | fillp.setAntiAlias(true); |
| 155 | fillp.setStyle(SkPaint::kStroke_Style); |
| 156 | |
| 157 | canvas->drawPath(fillpath, fillp); |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | private: |
| 162 | typedef SampleView INHERITED; |
| 163 | }; |
| 164 | |
| 165 | /////////////////////////////////////////////////////////////////////////////// |
| 166 | |
| 167 | static SkView* MyFactory() { return new OverstrokeView; } |
| 168 | static SkViewRegister reg(MyFactory); |