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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkPatchGrid.h"
static void draw_control_points(SkCanvas* canvas, const SkPoint cubics[12]) {
//draw control points
SkPaint paint;
SkPoint bottom[4];
SkPatchUtils::getBottomCubic(cubics, bottom);
SkPoint top[4];
SkPatchUtils::getTopCubic(cubics, top);
SkPoint left[4];
SkPatchUtils::getLeftCubic(cubics, left);
SkPoint right[4];
SkPatchUtils::getRightCubic(cubics, right);
paint.setColor(SK_ColorBLACK);
paint.setStrokeWidth(0.5);
SkPoint corners[4] = { bottom[0], bottom[3], top[0], top[3] };
canvas->drawPoints(SkCanvas::kLines_PointMode, 4, bottom, paint);
canvas->drawPoints(SkCanvas::kLines_PointMode, 2, bottom+1, paint);
canvas->drawPoints(SkCanvas::kLines_PointMode, 4, top, paint);
canvas->drawPoints(SkCanvas::kLines_PointMode, 4, left, paint);
canvas->drawPoints(SkCanvas::kLines_PointMode, 4, right, paint);
canvas->drawPoints(SkCanvas::kLines_PointMode, 2, top+1, paint);
canvas->drawPoints(SkCanvas::kLines_PointMode, 2, left+1, paint);
canvas->drawPoints(SkCanvas::kLines_PointMode, 2, right+1, paint);
paint.setStrokeWidth(2);
paint.setColor(SK_ColorRED);
canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, corners, paint);
paint.setColor(SK_ColorBLUE);
canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, bottom+1, paint);
paint.setColor(SK_ColorCYAN);
canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, top+1, paint);
paint.setColor(SK_ColorYELLOW);
canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, left+1, paint);
paint.setColor(SK_ColorGREEN);
canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, right+1, paint);
}
namespace skiagm {
/**
* This GM draws a grid of patches, it only uses colors so it could be considered a mesh gradient.
*/
class SkPatchGridGM : public GM {
public:
SkPatchGridGM() {
this->setBGColor(0xFFFFFFFF);
}
protected:
SkString onShortName() override {
return SkString("patch_grid");
}
SkISize onISize() override {
return SkISize::Make(800, 800);
}
void onDraw(SkCanvas* canvas) override {
SkPaint paint;
SkPoint vertices[4][5] = {
{{50,50}, {150,50}, {250,50},{350,50},{450,50}},
{{50,150}, {120,120}, {250,150},{350,150},{450,150}},
{{50,250}, {150,250}, {250,250},{350,250},{450,250}},
{{100,300}, {150,350}, {250,350},{350,350},{450,350}}
};
SkColor cornerColors[4][5] = {
{SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE},
{SK_ColorRED, SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE, SK_ColorRED},
{SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE},
{SK_ColorRED, SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE, SK_ColorRED},
};
SkPoint hrzCtrl[4][8] = {
{{75,30},{125,45},{175,70},{225,20},{275,50},{325,50},{375,5},{425,90}},
{{75,150},{125,150},{175,150},{225,150},{275,150},{325,150},{375,150},{425,150}},
{{75,250},{125,250},{175,250},{225,250},{275,200},{325,150},{375,250},{425,250}},
{{75,350},{125,350},{175,350},{225,350},{275,350},{325,350},{375,350},{425,350}}
};
SkPoint vrtCtrl[6][5] = {
{{50,75},{150,75},{250,75},{350,75},{450,75}},
{{50,125},{150,125},{250,125},{350,125},{450,125}},
{{50,175},{150,175},{220,225},{350,175},{470,225}},
{{50,225},{150,225},{220,175},{350,225},{470,155}},
{{50,275},{150,275},{250,275},{350,275},{400,305}},
{{50,325},{150,325},{250,325},{350,325},{450,325}}
};
static const int kRows = 3;
static const int kCols = 4;
canvas->scale(3, 3);
SkPatchGrid grid(kRows, kCols, SkPatchGrid::kColors_VertexType, nullptr);
for (int i = 0; i < kRows; i++) {
for (int j = 0; j < kCols; j++) {
SkPoint points[12];
//set corners
points[SkPatchUtils::kTopP0_CubicCtrlPts] = vertices[i][j];
points[SkPatchUtils::kTopP3_CubicCtrlPts] = vertices[i][j + 1];
points[SkPatchUtils::kBottomP0_CubicCtrlPts] = vertices[i + 1][j];
points[SkPatchUtils::kBottomP3_CubicCtrlPts] = vertices[i + 1][j + 1];
points[SkPatchUtils::kTopP1_CubicCtrlPts] = hrzCtrl[i][j * 2];
points[SkPatchUtils::kTopP2_CubicCtrlPts] = hrzCtrl[i][j * 2 + 1];
points[SkPatchUtils::kBottomP1_CubicCtrlPts] = hrzCtrl[i + 1][j * 2];
points[SkPatchUtils::kBottomP2_CubicCtrlPts] = hrzCtrl[i + 1][j * 2 + 1];
points[SkPatchUtils::kLeftP1_CubicCtrlPts] = vrtCtrl[i * 2][j];
points[SkPatchUtils::kLeftP2_CubicCtrlPts] = vrtCtrl[i * 2 + 1][j];
points[SkPatchUtils::kRightP1_CubicCtrlPts] = vrtCtrl[i * 2][j + 1];
points[SkPatchUtils::kRightP2_CubicCtrlPts] = vrtCtrl[i * 2 + 1][j + 1];
SkColor colors[4];
colors[0] = cornerColors[i][j];
colors[1] = cornerColors[i][j + 1];
colors[3] = cornerColors[i + 1][j];
colors[2] = cornerColors[i + 1][j + 1];
grid.setPatch(j, i, points, colors, nullptr);
}
}
grid.draw(canvas, paint);
SkISize dims = grid.getDimensions();
for (int y = 0; y < dims.height(); y++) {
for (int x = 0; x < dims.width(); x++) {
SkPoint cubics[12];
grid.getPatch(x, y, cubics, nullptr, nullptr);
draw_control_points(canvas, cubics);
}
}
}
private:
typedef GM INHERITED;
};
DEF_GM(return new SkPatchGridGM;)
}
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