31 lines
1.2 KiB
C++
31 lines
1.2 KiB
C++
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// Copyright 2020 Google LLC.
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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#include "tools/fiddle/examples.h"
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REG_FIDDLE(homogeneous, 256, 256, false, 3) {
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void draw(SkCanvas* canvas) {
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SkPoint3 src[] = {{3, 3, 1}, {8, 2, 2}, {5, 0, 4}, {0, 1, 3},
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{3, 7, 1}, {8, 6, 2}, {5, 4, 4}, {0, 5, 3}};
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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};
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constexpr int count = SK_ARRAY_COUNT(src);
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auto debugster = [=](SkPoint3 src[]) -> void {
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for (size_t i = 0; i < SK_ARRAY_COUNT(lines); i += 2) {
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const SkPoint3& s = src[lines[i]];
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const SkPoint3& e = src[lines[i + 1]];
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SkPaint paint;
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paint.setARGB(77, 23, 99, 154);
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canvas->drawLine(s.fX / s.fZ, s.fY / s.fZ, e.fX / e.fZ, e.fY / e.fZ, paint);
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}
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};
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canvas->save();
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canvas->translate(5, 5);
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canvas->scale(15, 15);
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debugster(src);
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canvas->restore();
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canvas->translate(128, 128);
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SkMatrix matrix;
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matrix.setAll(15, 0, 0, 0, 15, 0, -0.08, 0.04, 1);
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matrix.mapHomogeneousPoints(src, src, count);
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debugster(src);
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}
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} // END FIDDLE
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