1// Copyright 2019 Google LLC.
2// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
3#include "tools/fiddle/examples.h"
4// HASH=d56f93e4bc763c7ba4914321ed07a8b5
5REG_FIDDLE(Matrix_mapHomogeneousPoints, 256, 256, false, 0) {
6void draw(SkCanvas* canvas) {
7    SkPoint3 src[] = {{3, 3, 1}, {8, 2, 2}, {5, 0, 4}, {0, 1, 3},
8                      {3, 7, 1}, {8, 6, 2}, {5, 4, 4}, {0, 5, 3}};
9    int lines[] = { 0, 1, 1, 2, 2, 3, 3, 0, 4, 5, 5, 6, 6, 7, 7, 4, 0, 4, 1, 5, 2, 6, 3, 7 };
10    constexpr int count = SK_ARRAY_COUNT(src);
11    auto debugster = [=](SkPoint3 src[]) -> void {
12    for (size_t i = 0; i < SK_ARRAY_COUNT(lines); i += 2) {
13        const SkPoint3& s = src[lines[i]];
14        const SkPoint3& e = src[lines[i + 1]];
15        SkPaint paint;
16        paint.setARGB(77, 23, 99, 154);
17        canvas->drawLine(s.fX / s.fZ, s.fY / s.fZ, e.fX / e.fZ, e.fY / e.fZ, paint);
18    }
19    };
20    canvas->save();
21    canvas->translate(5, 5);
22    canvas->scale(15, 15);
23    debugster(src);
24    canvas->restore();
25    canvas->translate(128, 128);
26    SkMatrix matrix;
27    matrix.setAll(15, 0, 0, 0, 15, 0, -0.08f, 0.04f, 1);
28    matrix.mapHomogeneousPoints(src, src, count);
29    debugster(src);
30}
31}  // END FIDDLE
32