| // Copyright 2019 Google LLC. |
| // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file. |
| #include "tools/fiddle/examples.h" |
| // HASH=d56f93e4bc763c7ba4914321ed07a8b5 |
| REG_FIDDLE(Matrix_mapHomogeneousPoints, 256, 256, false, 0) { |
| void draw(SkCanvas* canvas) { |
| SkPoint3 src[] = {{3, 3, 1}, {8, 2, 2}, {5, 0, 4}, {0, 1, 3}, |
| {3, 7, 1}, {8, 6, 2}, {5, 4, 4}, {0, 5, 3}}; |
| 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 }; |
| constexpr int count = std::size(src); |
| auto debugster = [=](SkPoint3 src[]) -> void { |
| for (size_t i = 0; i < std::size(lines); i += 2) { |
| const SkPoint3& s = src[lines[i]]; |
| const SkPoint3& e = src[lines[i + 1]]; |
| SkPaint paint; |
| paint.setARGB(77, 23, 99, 154); |
| canvas->drawLine(s.fX / s.fZ, s.fY / s.fZ, e.fX / e.fZ, e.fY / e.fZ, paint); |
| } |
| }; |
| canvas->save(); |
| canvas->translate(5, 5); |
| canvas->scale(15, 15); |
| debugster(src); |
| canvas->restore(); |
| canvas->translate(128, 128); |
| SkMatrix matrix; |
| matrix.setAll(15, 0, 0, 0, 15, 0, -0.08f, 0.04f, 1); |
| matrix.mapHomogeneousPoints(src, src, count); |
| debugster(src); |
| } |
| } // END FIDDLE |