gm/patchgrid.cpp

   1
   2 /*
   3  * Copyright 2014 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  */
   8
   9 #include "gm.h"
  10 #include "SkPatchGrid.h"
  11
  12 static void draw_control_points(SkCanvas* canvas, const SkPoint cubics[12]) {
  13     //draw control points
  14     SkPaint paint;
  15     SkPoint bottom[4];
  16     SkPatchUtils::getBottomCubic(cubics, bottom);
  17     SkPoint top[4];
  18     SkPatchUtils::getTopCubic(cubics, top);
  19     SkPoint left[4];
  20     SkPatchUtils::getLeftCubic(cubics, left);
  21     SkPoint right[4];
  22     SkPatchUtils::getRightCubic(cubics, right);
  23
  24     paint.setColor(SK_ColorBLACK);
  25     paint.setStrokeWidth(0.5);
  26     SkPoint corners[4] = { bottom[0], bottom[3], top[0], top[3] };
  27     canvas->drawPoints(SkCanvas::kLines_PointMode, 4, bottom, paint);
  28     canvas->drawPoints(SkCanvas::kLines_PointMode, 2, bottom+1, paint);
  29     canvas->drawPoints(SkCanvas::kLines_PointMode, 4, top, paint);
  30     canvas->drawPoints(SkCanvas::kLines_PointMode, 4, left, paint);
  31     canvas->drawPoints(SkCanvas::kLines_PointMode, 4, right, paint);
  32
  33     canvas->drawPoints(SkCanvas::kLines_PointMode, 2, top+1, paint);
  34     canvas->drawPoints(SkCanvas::kLines_PointMode, 2, left+1, paint);
  35     canvas->drawPoints(SkCanvas::kLines_PointMode, 2, right+1, paint);
  36
  37     paint.setStrokeWidth(2);
  38
  39     paint.setColor(SK_ColorRED);
  40     canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, corners, paint);
  41
  42     paint.setColor(SK_ColorBLUE);
  43     canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, bottom+1, paint);
  44
  45     paint.setColor(SK_ColorCYAN);
  46     canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, top+1, paint);
  47
  48     paint.setColor(SK_ColorYELLOW);
  49     canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, left+1, paint);
  50
  51     paint.setColor(SK_ColorGREEN);
  52     canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, right+1, paint);
  53 }
  54
  55 namespace skiagm {
  56 /**
  57  * This GM draws a grid of patches, it only uses colors so it could be considered a mesh gradient.
  58  */
  59 class SkPatchGridGM : public GM {
  60
  61 public:
  62     SkPatchGridGM() {
  63         this->setBGColor(0xFFFFFFFF);
  64     }
  65
  66 protected:
  67     SkString onShortName() SK_OVERRIDE {
  68         return SkString("patch_grid");
  69     }
  70
  71     SkISize onISize() SK_OVERRIDE {
  72         return SkISize::Make(800, 800);
  73     }
  74
  75     void onDraw(SkCanvas* canvas) SK_OVERRIDE {
  76
  77         SkPaint paint;
  78
  79         SkPoint vertices[4][5] = {
  80             {{50,50}, {150,50}, {250,50},{350,50},{450,50}},
  81             {{50,150}, {120,120}, {250,150},{350,150},{450,150}},
  82             {{50,250}, {150,250}, {250,250},{350,250},{450,250}},
  83             {{100,300}, {150,350}, {250,350},{350,350},{450,350}}
  84         };
  85
  86         SkColor cornerColors[4][5] = {
  87             {SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE},
  88             {SK_ColorRED, SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE, SK_ColorRED},
  89             {SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE},
  90             {SK_ColorRED, SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE, SK_ColorRED},
  91         };
  92
  93         SkPoint hrzCtrl[4][8] = {
  94             {{75,30},{125,45},{175,70},{225,20},{275,50},{325,50},{375,5},{425,90}},
  95             {{75,150},{125,150},{175,150},{225,150},{275,150},{325,150},{375,150},{425,150}},
  96             {{75,250},{125,250},{175,250},{225,250},{275,200},{325,150},{375,250},{425,250}},
  97             {{75,350},{125,350},{175,350},{225,350},{275,350},{325,350},{375,350},{425,350}}
  98         };
  99
 100         SkPoint vrtCtrl[6][5] = {
 101             {{50,75},{150,75},{250,75},{350,75},{450,75}},
 102             {{50,125},{150,125},{250,125},{350,125},{450,125}},
 103             {{50,175},{150,175},{220,225},{350,175},{470,225}},
 104             {{50,225},{150,225},{220,175},{350,225},{470,155}},
 105             {{50,275},{150,275},{250,275},{350,275},{400,305}},
 106             {{50,325},{150,325},{250,325},{350,325},{450,325}}
 107         };
 108
 109         static const int kRows = 3;
 110         static const int kCols = 4;
 111
 112         canvas->scale(3, 3);
 113         SkPatchGrid grid(kRows, kCols, SkPatchGrid::kColors_VertexType, NULL);
 114         for (int i = 0; i < kRows; i++) {
 115             for (int j = 0; j < kCols; j++) {
 116                 SkPoint points[12];
 117
 118                 //set corners
 119                 points[SkPatchUtils::kTopP0_CubicCtrlPts] = vertices[i][j];
 120                 points[SkPatchUtils::kTopP3_CubicCtrlPts] = vertices[i][j + 1];
 121                 points[SkPatchUtils::kBottomP0_CubicCtrlPts] = vertices[i + 1][j];
 122                 points[SkPatchUtils::kBottomP3_CubicCtrlPts] = vertices[i + 1][j + 1];
 123
 124                 points[SkPatchUtils::kTopP1_CubicCtrlPts] = hrzCtrl[i][j * 2];
 125                 points[SkPatchUtils::kTopP2_CubicCtrlPts] = hrzCtrl[i][j * 2 + 1];
 126                 points[SkPatchUtils::kBottomP1_CubicCtrlPts] = hrzCtrl[i + 1][j * 2];
 127                 points[SkPatchUtils::kBottomP2_CubicCtrlPts] = hrzCtrl[i + 1][j * 2 + 1];
 128
 129                 points[SkPatchUtils::kLeftP1_CubicCtrlPts] = vrtCtrl[i * 2][j];
 130                 points[SkPatchUtils::kLeftP2_CubicCtrlPts] = vrtCtrl[i * 2 + 1][j];
 131                 points[SkPatchUtils::kRightP1_CubicCtrlPts] = vrtCtrl[i * 2][j + 1];
 132                 points[SkPatchUtils::kRightP2_CubicCtrlPts] = vrtCtrl[i * 2 + 1][j + 1];
 133
 134                 SkColor colors[4];
 135                 colors[0] = cornerColors[i][j];
 136                 colors[1] = cornerColors[i][j + 1];
 137                 colors[3] = cornerColors[i + 1][j];
 138                 colors[2] = cornerColors[i + 1][j + 1];
 139
 140                 grid.setPatch(j, i, points, colors, NULL);
 141             }
 142         }
 143
 144         grid.draw(canvas, paint);
 145         SkISize dims = grid.getDimensions();
 146         for (int y = 0; y < dims.height(); y++) {
 147             for (int x = 0; x < dims.width(); x++) {
 148                 SkPoint cubics[12];
 149                 grid.getPatch(x, y, cubics, NULL, NULL);
 150                 draw_control_points(canvas, cubics);
 151             }
 152         }
 153     }
 154
 155 private:
 156     typedef GM INHERITED;
 157 };
 158
 159 DEF_GM(return SkNEW(SkPatchGridGM); )
 160
 161 }