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Jim Van Verth623fadf2017-05-23 13:50:58 -04001
2/*
3 * Copyright 2017 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
Ben Wagnerb2c4ea62018-08-08 11:36:17 -04008#include "Sample.h"
Jim Van Verth623fadf2017-05-23 13:50:58 -04009#include "Resources.h"
10#include "SkCanvas.h"
11#include "SkImage.h"
12#include "SkPath.h"
13#include "SkPoint3.h"
14#include "SkShadowUtils.h"
15
16////////////////////////////////////////////////////////////////////////////
17// Sample to compare the Material Design shadow reference to our results
18
Ben Wagnerb2c4ea62018-08-08 11:36:17 -040019class ShadowRefView : public Sample {
Jim Van Verth623fadf2017-05-23 13:50:58 -040020 SkPath fRRectPath;
21 sk_sp<SkImage> fReferenceImage;
22
23 bool fShowAmbient;
24 bool fShowSpot;
25 bool fUseAlt;
26 bool fShowObject;
27
28public:
29 ShadowRefView()
30 : fShowAmbient(true)
31 , fShowSpot(true)
32 , fUseAlt(false)
33 , fShowObject(true) {}
34
35protected:
36 void onOnceBeforeDraw() override {
37 fRRectPath.addRRect(SkRRect::MakeRectXY(SkRect::MakeXYWH(-130, -128.5, 130, 128.5), 4, 4));
Hal Canaryc465d132017-12-08 10:21:31 -050038 fReferenceImage = GetResourceAsImage("images/shadowreference.png");
Jim Van Verth623fadf2017-05-23 13:50:58 -040039 }
40
Ben Wagnerb2c4ea62018-08-08 11:36:17 -040041 bool onQuery(Sample::Event* evt) override {
42 if (Sample::TitleQ(*evt)) {
43 Sample::TitleR(evt, "ShadowReference");
Jim Van Verth623fadf2017-05-23 13:50:58 -040044 return true;
45 }
46
47 SkUnichar uni;
Ben Wagnerb2c4ea62018-08-08 11:36:17 -040048 if (Sample::CharQ(*evt, &uni)) {
Jim Van Verth623fadf2017-05-23 13:50:58 -040049 bool handled = false;
50 switch (uni) {
51 case 'W':
52 fShowAmbient = !fShowAmbient;
53 handled = true;
54 break;
55 case 'S':
56 fShowSpot = !fShowSpot;
57 handled = true;
58 break;
59 case 'T':
60 fUseAlt = !fUseAlt;
61 handled = true;
62 break;
63 case 'O':
64 fShowObject = !fShowObject;
65 handled = true;
66 break;
67 default:
68 break;
69 }
70 if (handled) {
Jim Van Verth623fadf2017-05-23 13:50:58 -040071 return true;
72 }
73 }
74 return this->INHERITED::onQuery(evt);
75 }
76
77 void drawBG(SkCanvas* canvas) {
78 canvas->drawColor(0xFFFFFFFF);
79 canvas->drawImage(fReferenceImage, 10, 30);
80 }
81
82 void drawShadowedPath(SkCanvas* canvas, const SkPath& path,
83 const SkPoint3& zPlaneParams,
84 const SkPaint& paint, SkScalar ambientAlpha,
85 const SkPoint3& lightPos, SkScalar lightWidth, SkScalar spotAlpha) {
86 if (!fShowAmbient) {
87 ambientAlpha = 0;
88 }
89 if (!fShowSpot) {
90 spotAlpha = 0;
91 }
92 uint32_t flags = 0;
93 if (fUseAlt) {
94 flags |= SkShadowFlags::kGeometricOnly_ShadowFlag;
95 }
Jim Van Vertha5566842018-02-22 10:58:34 -050096
97 SkColor ambientColor = SkColorSetARGB(ambientAlpha * 255, 0, 0, 0);
98 SkColor spotColor = SkColorSetARGB(spotAlpha * 255, 0, 0, 0);
Jim Van Verth623fadf2017-05-23 13:50:58 -040099 SkShadowUtils::DrawShadow(canvas, path, zPlaneParams,
100 lightPos, lightWidth,
Jim Van Vertha5566842018-02-22 10:58:34 -0500101 ambientColor, spotColor, flags);
Jim Van Verth623fadf2017-05-23 13:50:58 -0400102
103 if (fShowObject) {
104 canvas->drawPath(path, paint);
105 } else {
106 SkPaint strokePaint;
107
108 strokePaint.setColor(paint.getColor());
109 strokePaint.setStyle(SkPaint::kStroke_Style);
110
111 canvas->drawPath(path, strokePaint);
112 }
113 }
114
115 void onDrawContent(SkCanvas* canvas) override {
116 this->drawBG(canvas);
117 const SkScalar kDP = 4; // the reference image is 4x bigger than it is displayed on
118 // on the web page, so we need to reflect that here and
119 // multiply the heights and light params accordingly
120 const SkScalar kLightWidth = kDP*400;
121 const SkScalar kAmbientAlpha = 0.03f;
122 const SkScalar kSpotAlpha = 0.35f;
123
124 SkPaint paint;
125 paint.setAntiAlias(true);
126 paint.setColor(SK_ColorWHITE);
127
128 SkPoint3 lightPos = { 175, -800, kDP * 600 };
129 SkScalar xPos = 230;
130 SkScalar yPos = 254.25f;
131 SkRect clipRect = SkRect::MakeXYWH(45, 75, 122, 250);
132 SkPoint clipDelta = SkPoint::Make(320, 0);
133 SkPoint3 zPlaneParams = SkPoint3::Make(0, 0, kDP * 2);
134
135 canvas->save();
136 canvas->clipRect(clipRect);
137 canvas->translate(xPos, yPos);
138 this->drawShadowedPath(canvas, fRRectPath, zPlaneParams, paint, kAmbientAlpha,
139 lightPos, kLightWidth, kSpotAlpha);
140 canvas->restore();
141
142 lightPos.fX += 320;
143 xPos += 320;
144 clipRect.offset(clipDelta);
145 zPlaneParams.fZ = kDP * 3;
146 canvas->save();
147 canvas->clipRect(clipRect);
148 canvas->translate(xPos, yPos);
149 this->drawShadowedPath(canvas, fRRectPath, zPlaneParams, paint, kAmbientAlpha,
150 lightPos, kLightWidth, kSpotAlpha);
151 canvas->restore();
152
153 lightPos.fX += 320;
154 xPos += 320;
155 clipRect.offset(clipDelta);
156 zPlaneParams.fZ = kDP * 4;
157 canvas->save();
158 canvas->clipRect(clipRect);
159 canvas->translate(xPos, yPos);
160 this->drawShadowedPath(canvas, fRRectPath, zPlaneParams, paint, kAmbientAlpha,
161 lightPos, kLightWidth, kSpotAlpha);
162 canvas->restore();
163
164 lightPos.fX += 320;
165 xPos += 320;
166 clipRect.offset(clipDelta);
167 zPlaneParams.fZ = kDP * 6;
168 canvas->save();
169 canvas->clipRect(clipRect);
170 canvas->translate(xPos, yPos);
171 this->drawShadowedPath(canvas, fRRectPath, zPlaneParams, paint, kAmbientAlpha,
172 lightPos, kLightWidth, kSpotAlpha);
173 canvas->restore();
174
175 lightPos.fX += 320;
176 xPos += 320;
177 clipRect.offset(clipDelta);
178 zPlaneParams.fZ = kDP * 8;
179 canvas->save();
180 canvas->clipRect(clipRect);
181 canvas->translate(xPos, yPos);
182 this->drawShadowedPath(canvas, fRRectPath, zPlaneParams, paint, kAmbientAlpha,
183 lightPos, kLightWidth, kSpotAlpha);
184 canvas->restore();
185
186 lightPos.fX += 320;
187 xPos += 320;
188 clipRect.offset(clipDelta);
189 zPlaneParams.fZ = kDP * 16;
190 canvas->save();
191 canvas->clipRect(clipRect);
192 canvas->translate(xPos, yPos);
193 this->drawShadowedPath(canvas, fRRectPath, zPlaneParams, paint, kAmbientAlpha,
194 lightPos, kLightWidth, kSpotAlpha);
195 canvas->restore();
196
197 }
198
199private:
Ben Wagnerb2c4ea62018-08-08 11:36:17 -0400200 typedef Sample INHERITED;
Jim Van Verth623fadf2017-05-23 13:50:58 -0400201};
202
203//////////////////////////////////////////////////////////////////////////////
204
Ben Wagnerb2c4ea62018-08-08 11:36:17 -0400205DEF_SAMPLE( return new ShadowRefView(); )