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Unified Diff: gm/dashcircle.cpp

Issue 1602153002: fix circular dashing (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: fix test Created 4 years, 11 months ago
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Index: gm/dashcircle.cpp
diff --git a/gm/dashcircle.cpp b/gm/dashcircle.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..cddd913723128addbd8ea25fb7720607064e1fd5
--- /dev/null
+++ b/gm/dashcircle.cpp
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "gm.h"
+#include "SkPath.h"
+#include "SkDashPathEffect.h"
+
+int dash1[] = { 1, 1 };
+int dash2[] = { 1, 3 };
+int dash3[] = { 1, 1, 3, 3 };
+int dash4[] = { 1, 3, 2, 4 };
+
+struct DashExample {
+ int* pattern;
+ int length;
+} dashExamples[] = {
+ { dash1, SK_ARRAY_COUNT(dash1) },
+ { dash2, SK_ARRAY_COUNT(dash2) },
+ { dash3, SK_ARRAY_COUNT(dash3) },
+ { dash4, SK_ARRAY_COUNT(dash4) }
+};
+
+DEF_SIMPLE_GM(dashcircle, canvas, 900, 1200) {
+ SkPaint refPaint;
+ refPaint.setAntiAlias(true);
+ refPaint.setColor(0xFFbf3f7f);
+ refPaint.setStyle(SkPaint::kStroke_Style);
+ refPaint.setStrokeWidth(1);
+ const SkScalar radius = 125;
+ SkRect oval = SkRect::MakeLTRB(-radius - 20, -radius - 20, radius + 20, radius + 20);
+ SkPath circle;
+ circle.addCircle(0, 0, radius);
+ SkScalar circumference = radius * SK_ScalarPI * 2;
+ int wedges[] = { 6, 12, 36 };
+ canvas->translate(radius + 20, radius + 20);
+ for (int wedge : wedges) {
+ SkScalar arcLength = 360.f / wedge;
+ canvas->save();
+ for (const DashExample& dashExample : dashExamples) {
+ SkPath refPath;
+ int dashUnits = 0;
+ for (int index = 0; index < dashExample.length; ++index) {
+ dashUnits += dashExample.pattern[index];
+ }
+ SkScalar unitLength = arcLength / dashUnits;
+ SkScalar angle = 0;
+ for (int index = 0; index < wedge; ++index) {
+ for (int i2 = 0; i2 < dashExample.length; i2 += 2) {
+ SkScalar span = dashExample.pattern[i2] * unitLength;
+ refPath.moveTo(0, 0);
+ refPath.arcTo(oval, angle, span, false);
+ refPath.close();
+ angle += span + (dashExample.pattern[i2 + 1]) * unitLength;
+ }
+ }
+ canvas->drawPath(refPath, refPaint);
+ SkPaint p;
+ p.setAntiAlias(true);
+ p.setStyle(SkPaint::kStroke_Style);
+ p.setStrokeWidth(10);
+ SkScalar intervals[4];
+ int intervalCount = dashExample.length;
+ SkScalar dashLength = circumference / wedge / dashUnits;
+ for (int index = 0; index < dashExample.length; ++index) {
+ intervals[index] = dashExample.pattern[index] * dashLength;
+ }
+ p.setPathEffect(SkDashPathEffect::Create(intervals, intervalCount, 0))->unref();
+ canvas->drawPath(circle, p);
+ canvas->translate(0, radius * 2 + 50);
+ }
+ canvas->restore();
+ canvas->translate(radius * 2 + 50, 0);
+ }
+}
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