1 /* 2 * Copyright 2016 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "gm.h" 9 #include "SkPath.h" 10 #include "SkDashPathEffect.h" 11 12 int dash1[] = { 1, 1 }; 13 int dash2[] = { 1, 3 }; 14 int dash3[] = { 1, 1, 3, 3 }; 15 int dash4[] = { 1, 3, 2, 4 }; 16 17 struct DashExample { 18 int* pattern; 19 int length; 20 } dashExamples[] = { 21 { dash1, SK_ARRAY_COUNT(dash1) }, 22 { dash2, SK_ARRAY_COUNT(dash2) }, 23 { dash3, SK_ARRAY_COUNT(dash3) }, 24 { dash4, SK_ARRAY_COUNT(dash4) } 25 }; 26 27 DEF_SIMPLE_GM(dashcircle, canvas, 900, 1200) { 28 SkPaint refPaint; 29 refPaint.setAntiAlias(true); 30 refPaint.setColor(0xFFbf3f7f); 31 refPaint.setStyle(SkPaint::kStroke_Style); 32 refPaint.setStrokeWidth(1); 33 const SkScalar radius = 125; 34 SkRect oval = SkRect::MakeLTRB(-radius - 20, -radius - 20, radius + 20, radius + 20); 35 SkPath circle; 36 circle.addCircle(0, 0, radius); 37 SkScalar circumference = radius * SK_ScalarPI * 2; 38 int wedges[] = { 6, 12, 36 }; 39 canvas->translate(radius + 20, radius + 20); 40 for (int wedge : wedges) { 41 SkScalar arcLength = 360.f / wedge; 42 canvas->save(); 43 for (const DashExample& dashExample : dashExamples) { 44 SkPath refPath; 45 int dashUnits = 0; 46 for (int index = 0; index < dashExample.length; ++index) { 47 dashUnits += dashExample.pattern[index]; 48 } 49 SkScalar unitLength = arcLength / dashUnits; 50 SkScalar angle = 0; 51 for (int index = 0; index < wedge; ++index) { 52 for (int i2 = 0; i2 < dashExample.length; i2 += 2) { 53 SkScalar span = dashExample.pattern[i2] * unitLength; 54 refPath.moveTo(0, 0); 55 refPath.arcTo(oval, angle, span, false); 56 refPath.close(); 57 angle += span + (dashExample.pattern[i2 + 1]) * unitLength; 58 } 59 } 60 canvas->drawPath(refPath, refPaint); 61 SkPaint p; 62 p.setAntiAlias(true); 63 p.setStyle(SkPaint::kStroke_Style); 64 p.setStrokeWidth(10); 65 SkScalar intervals[4]; 66 int intervalCount = dashExample.length; 67 SkScalar dashLength = circumference / wedge / dashUnits; 68 for (int index = 0; index < dashExample.length; ++index) { 69 intervals[index] = dashExample.pattern[index] * dashLength; 70 } 71 p.setPathEffect(SkDashPathEffect::Create(intervals, intervalCount, 0))->unref(); 72 canvas->drawPath(circle, p); 73 canvas->translate(0, radius * 2 + 50); 74 } 75 canvas->restore(); 76 canvas->translate(radius * 2 + 50, 0); 77 } 78 } 79
