37 lines
1.5 KiB
C++
37 lines
1.5 KiB
C++
// Copyright 2019 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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// HASH=5de2de0f00354e59074a9bb1a42d5a63
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REG_FIDDLE(Miter_Limit, 384, 170, false, 0) {
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void draw(SkCanvas* canvas) {
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SkPoint pts[] = {{ 10, 50 }, { 110, 80 }, { 10, 110 }};
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SkVector v[] = { pts[0] - pts[1], pts[2] - pts[1] };
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SkScalar angle1 = SkScalarATan2(v[0].fY, v[0].fX);
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SkScalar angle2 = SkScalarATan2(v[1].fY, v[1].fX);
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const SkScalar strokeWidth = 20;
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SkScalar miterLimit = 1 / SkScalarSin((angle2 - angle1) / 2);
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SkScalar miterLength = strokeWidth * miterLimit;
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SkPath path;
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path.moveTo(pts[0]);
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path.lineTo(pts[1]);
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path.lineTo(pts[2]);
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SkPaint paint; // set to default kMiter_Join
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paint.setAntiAlias(true);
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeMiter(miterLimit);
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paint.setStrokeWidth(strokeWidth);
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canvas->drawPath(path, paint);
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paint.setStrokeWidth(1);
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canvas->drawLine(pts[1].fX - miterLength / 2, pts[1].fY + 50,
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pts[1].fX + miterLength / 2, pts[1].fY + 50, paint);
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canvas->translate(200, 0);
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miterLimit *= 0.99f;
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paint.setStrokeMiter(miterLimit);
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paint.setStrokeWidth(strokeWidth);
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canvas->drawPath(path, paint);
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paint.setStrokeWidth(1);
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canvas->drawLine(pts[1].fX - miterLength / 2, pts[1].fY + 50,
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pts[1].fX + miterLength / 2, pts[1].fY + 50, paint);
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}
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} // END FIDDLE
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