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      1 /*
      2 * Copyright 2017 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 "SkPath.h"
     11 #include "SkShadowUtils.h"
     12 
     13 enum BackgroundMode {
     14     kLightBackground,
     15     kDarkBackground
     16 };
     17 
     18 static constexpr int kW = 1225;
     19 static constexpr int kH = 550;
     20 
     21 void draw_content(SkCanvas* canvas, BackgroundMode mode) {
     22     const SkScalar kLightWidth = 600;
     23     const SkScalar kAmbientAlpha = 0.03f;
     24     const SkScalar kSpotAlpha = 0.25f;
     25 
     26     const SkColor kColors[30] = {
     27         // purples
     28         0xFF3A0072, 0xFF5D0099, 0xFF7F12B2, 0xFFA02AD1, 0xFFC245E5,
     29         0xFFE95AF9, 0xFFFC79F0, 0xFFFDA6F0, 0xFFFFCCF8, 0xFFFFE1F9,
     30         // oranges
     31         0xFFEA3200, 0xFFFF4E00, 0xFFFF7300, 0xFFFF9100, 0xFFFFB000,
     32         0xFFFFCE00, 0xFFFFE000, 0xFFFFF64D, 0xFFFFF98F, 0xFFFFFBCC,
     33         // teals
     34         0xFF004D51, 0xFF066266, 0xFF057F7F, 0xFF009999, 0xFF00B2B2,
     35         0xFF15CCBE, 0xFF25E5CE, 0xFF2CFFE0, 0xFF80FFEA, 0xFFB3FFF0
     36     };
     37 
     38     SkPaint paint;
     39     paint.setAntiAlias(true);
     40     if (mode == kDarkBackground) {
     41         canvas->drawColor(0xFF111111);
     42     } else {
     43         canvas->drawColor(0xFFEAEAEA);
     44     }
     45 
     46     SkPath path;
     47     path.addRect(SkRect::MakeXYWH(-50, -50, 100, 100));
     48 
     49     SkPoint3 lightPos = { 75, -400, 600 };
     50     SkPoint3 zPlaneParams = SkPoint3::Make(0, 0, 16);
     51     SkScalar yPos = 75;
     52 
     53     for (int row = 0; row < 3; ++row) {
     54         lightPos.fX = 75;
     55         SkScalar xPos = 75;
     56         for (int col = 0; col < 10; ++col) {
     57             paint.setColor(kColors[10 * row + col]);
     58 
     59             canvas->save();
     60             canvas->translate(xPos, yPos);
     61             SkShadowUtils::DrawShadow(canvas, path, zPlaneParams,
     62                                       lightPos, kLightWidth,
     63                                       kAmbientAlpha, kSpotAlpha, paint.getColor(), 0);
     64             canvas->drawPath(path, paint);
     65             canvas->restore();
     66 
     67             lightPos.fX += 120;
     68             xPos += 120;
     69         }
     70 
     71         lightPos.fY += 200;
     72         yPos += 200;
     73     }
     74 }
     75 
     76 DEF_SIMPLE_GM(tonalshadows_light, canvas, kW, kH) {
     77     draw_content(canvas, kLightBackground);
     78 }
     79 
     80 DEF_SIMPLE_GM(tonalshadows_dark, canvas, kW, kH) {
     81     draw_content(canvas, kDarkBackground);
     82 }
     83 
     84 
     85 
     86