// 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 "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 = SK_ARRAY_COUNT(src); auto debugster = [=](SkPoint3 src[]) -> void { for (size_t i = 0; i < SK_ARRAY_COUNT(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