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/*************************************************************************
** TriangularPatchTest.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2025 Martin Gieseking <martin.gieseking@uos.de> **
** **
** This program is free software; you can redistribute it and/or **
** modify it under the terms of the GNU General Public License as **
** published by the Free Software Foundation; either version 3 of **
** the License, or (at your option) any later version. **
** **
** This program is distributed in the hope that it will be useful, but **
** WITHOUT ANY WARRANTY; without even the implied warranty of **
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the **
** GNU General Public License for more details. **
** **
** You should have received a copy of the GNU General Public License **
** along with this program; if not, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#include <gtest/gtest.h>
#include "TriangularPatch.hpp"
using namespace std;
TEST(TriangularPatchTest, construct) {
TriangularPatch tp1(Color::ColorSpace::RGB);
EXPECT_EQ(tp1.psShadingType(), 4);
EXPECT_EQ(tp1.numPoints(0), 3);
EXPECT_EQ(tp1.numColors(0), 3);
EXPECT_EQ(tp1.numPoints(1), 1);
EXPECT_EQ(tp1.numColors(1), 1);
vector<DPair> points(1);
points[0] = DPair(10, 0);
vector<Color> colors(1);
TriangularPatch tp2(points, colors, Color::ColorSpace::RGB, 1, &tp1);
EXPECT_EQ(tp1.psShadingType(), 4);
LatticeTriangularPatch tp3(Color::ColorSpace::RGB);
EXPECT_EQ(tp3.psShadingType(), 5);
}
TEST(TriangularPatchTest, valueAt) {
vector<DPair> points(3);
points[0] = DPair(0, 0);
points[1] = DPair(10, 0);
points[2] = DPair(0, 10);
vector<Color> colors(3);
TriangularPatch tp1(points, colors, Color::ColorSpace::RGB, 0, 0);
EXPECT_EQ(tp1.valueAt(0, 0), DPair(0,0));
EXPECT_EQ(tp1.valueAt(1, 0), DPair(10,0));
EXPECT_EQ(tp1.valueAt(0, 1), DPair(0,10));
points.resize(1);
colors.resize(1);
points[0] = DPair(10, 10);
TriangularPatch tp2(points, colors, Color::ColorSpace::RGB, 1, &tp1);
EXPECT_EQ(tp2.valueAt(0, 0), DPair(10,10));
EXPECT_EQ(tp2.valueAt(1, 0), DPair(10,0));
EXPECT_EQ(tp2.valueAt(0, 1), DPair(0,10));
TriangularPatch tp3(points, colors, Color::ColorSpace::RGB, 2, &tp1);
EXPECT_EQ(tp3.valueAt(0, 0), DPair(10,10));
EXPECT_EQ(tp3.valueAt(1, 0), DPair(0,10));
EXPECT_EQ(tp3.valueAt(0, 1), DPair(0,0));
tp1.setPoints(DPair(20,20), DPair(20,40), DPair(40,20));
EXPECT_EQ(tp1.valueAt(0, 0), DPair(20,20));
EXPECT_EQ(tp1.valueAt(1, 0), DPair(20,40));
EXPECT_EQ(tp1.valueAt(0, 1), DPair(40,20));
}
TEST(TriangularPatchTest, colorAt) {
vector<DPair> points(3);
vector<Color> colors(3);
colors[0] = Color(1.0, 0.0, 0.0);
colors[1] = Color(0.0, 1.0, 0.0);
colors[2] = Color(0.0, 0.0, 1.0);
TriangularPatch tp1(points, colors, Color::ColorSpace::RGB, 0, 0);
EXPECT_EQ(tp1.colorAt(0, 0), Color(1.0, 0.0, 0.0));
EXPECT_EQ(tp1.colorAt(1, 0), Color(0.0, 1.0, 0.0));
EXPECT_EQ(tp1.colorAt(0, 1), Color(0.0, 0.0, 1.0));
points.resize(1);
colors.resize(1);
colors[0] = Color(1.0, 1.0, 0.0);
TriangularPatch tp2(points, colors, Color::ColorSpace::RGB, 1, &tp1);
EXPECT_EQ(tp2.colorAt(0, 0), Color(1.0, 1.0, 0.0));
EXPECT_EQ(tp2.colorAt(1, 0), Color(0.0, 1.0, 0.0));
EXPECT_EQ(tp2.colorAt(0, 1), Color(0.0, 0.0, 1.0));
TriangularPatch tp3(points, colors, Color::ColorSpace::RGB, 2, &tp1);
EXPECT_EQ(tp3.colorAt(0, 0), Color(1.0, 1.0, 0.0));
EXPECT_EQ(tp3.colorAt(1, 0), Color(0.0, 0.0, 1.0));
EXPECT_EQ(tp3.colorAt(0, 1), Color(1.0, 0.0, 0.0));
tp1.setColors(Color(1.0, 1.0, 0.0), Color(1.0, 0.0, 1.0), Color(0.0, 1.0, 1.0));
EXPECT_EQ(tp1.colorAt(0, 0), Color(1.0, 1.0, 0.0));
EXPECT_EQ(tp1.colorAt(1, 0), Color(1.0, 0.0, 1.0));
EXPECT_EQ(tp1.colorAt(0, 1), Color(0.0, 1.0, 1.0));
}
TEST(TriangularPatchTest, bbox) {
vector<DPair> points(3);
points[0] = DPair(0, 0);
points[1] = DPair(10, 0);
points[2] = DPair(0, 10);
vector<Color> colors(3);
TriangularPatch tp(points, colors, Color::ColorSpace::RGB, 0, 0);
BoundingBox bbox = tp.getBBox();
EXPECT_EQ(bbox, BoundingBox(0, 0, 10, 10));
}
TEST(TriangularPatchTest, boundaryPath) {
vector<DPair> points(3);
points[0] = DPair(0, 0);
points[1] = DPair(10, 0);
points[2] = DPair(0, 10);
vector<Color> colors(3);
TriangularPatch tp(points, colors, Color::ColorSpace::RGB, 0, 0);
GraphicsPath<double> path = tp.getBoundaryPath();
ostringstream oss;
path.writeSVG(oss, false);
EXPECT_EQ(oss.str(), "M0 0H10L0 10Z");
}
class Callback : public ShadingPatch::Callback {
public:
void patchSegment (GraphicsPath<double> &path, const Color &color) {
ostringstream oss;
path.writeSVG(oss, false);
_pathstr += oss.str();
_colorstr += color.rgbString();
}
string pathstr() const {return _pathstr;}
string colorstr() const {return _colorstr;}
void reset () {_pathstr.clear(); _colorstr.clear();}
private:
string _pathstr;
string _colorstr;
};
TEST(TriangularPatchTest, approximate) {
vector<DPair> points(3);
points[0] = DPair(0, 0);
points[1] = DPair(10, 0);
points[2] = DPair(0, 10);
vector<Color> colors(3);
TriangularPatch tp(points, colors, Color::ColorSpace::RGB, 0, 0);
Callback callback;
tp.approximate(2, false, 0.1, callback);
EXPECT_EQ(callback.pathstr(), "M0 0H10L0 10Z");
EXPECT_EQ(callback.colorstr(), "#000");
callback.reset();
tp.setColors(Color(1.0, 0.0, 0.0), Color(0.0, 1.0, 0.0), Color(0.0, 0.0, 1.0));
tp.approximate(2, false, 0.1, callback);
EXPECT_EQ(callback.pathstr(), "M0 0H5L0 5ZM0 5L5 0V5ZM0 5H5L0 10ZM5 0H10L5 5Z");
EXPECT_EQ(callback.colorstr(), "#aa2b2b#555#2b2baa#2baa2b");
}
TEST(TriangularPatchTest, fail) {
vector<DPair> points(3);
vector<Color> colors(3);
TriangularPatch tp(points, colors, Color::ColorSpace::RGB, 0, 0);
EXPECT_THROW(tp.setColors(colors, 1, 0), ShadingException);
for (int i=1; i <= 3; i++) {
EXPECT_THROW(TriangularPatch(points, colors, Color::ColorSpace::RGB, i, 0), ShadingException);
}
points.resize(2);
EXPECT_THROW(TriangularPatch(points, colors, Color::ColorSpace::RGB, 0, 0), ShadingException);
points.resize(3);
colors.resize(2);
EXPECT_THROW(TriangularPatch(points, colors, Color::ColorSpace::RGB, 0, 0), ShadingException);
}
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