1
2 /*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8 #include "Test.h"
9 #include "SkPathMeasure.h"
10
TestPathMeasure(skiatest::Reporter * reporter)11 static void TestPathMeasure(skiatest::Reporter* reporter) {
12 SkPath path;
13
14 path.moveTo(0, 0);
15 path.lineTo(SK_Scalar1, 0);
16 path.lineTo(SK_Scalar1, SK_Scalar1);
17 path.lineTo(0, SK_Scalar1);
18
19 SkPathMeasure meas(path, true);
20 SkScalar length = meas.getLength();
21 SkASSERT(length == SK_Scalar1*4);
22
23 path.reset();
24 path.moveTo(0, 0);
25 path.lineTo(SK_Scalar1*3, SK_Scalar1*4);
26 meas.setPath(&path, false);
27 length = meas.getLength();
28 REPORTER_ASSERT(reporter, length == SK_Scalar1*5);
29
30 path.reset();
31 path.addCircle(0, 0, SK_Scalar1);
32 meas.setPath(&path, true);
33 length = meas.getLength();
34 // SkDebugf("circle arc-length = %g\n", length);
35
36 for (int i = 0; i < 8; i++) {
37 SkScalar d = length * i / 8;
38 SkPoint p;
39 SkVector v;
40 meas.getPosTan(d, &p, &v);
41 #if 0
42 SkDebugf("circle arc-length=%g, pos[%g %g] tan[%g %g]\n",
43 d, p.fX, p.fY, v.fX, v.fY);
44 #endif
45 }
46
47 // Test the behavior following a close not followed by a move.
48 path.reset();
49 path.lineTo(SK_Scalar1, 0);
50 path.lineTo(SK_Scalar1, SK_Scalar1);
51 path.lineTo(0, SK_Scalar1);
52 path.close();
53 path.lineTo(-SK_Scalar1, 0);
54 meas.setPath(&path, false);
55 length = meas.getLength();
56 REPORTER_ASSERT(reporter, length == SK_Scalar1 * 4);
57 meas.nextContour();
58 length = meas.getLength();
59 REPORTER_ASSERT(reporter, length == SK_Scalar1);
60 SkPoint position;
61 SkVector tangent;
62 REPORTER_ASSERT(reporter, meas.getPosTan(SK_ScalarHalf, &position, &tangent));
63 REPORTER_ASSERT(reporter,
64 SkScalarNearlyEqual(position.fX, -SK_ScalarHalf, SK_Scalar1 * 0.0001));
65 REPORTER_ASSERT(reporter, position.fY == 0);
66 REPORTER_ASSERT(reporter, tangent.fX == -SK_Scalar1);
67 REPORTER_ASSERT(reporter, tangent.fY == 0);
68
69 // Test degenerate paths
70 path.reset();
71 path.moveTo(0, 0);
72 path.lineTo(0, 0);
73 path.lineTo(SK_Scalar1, 0);
74 path.quadTo(SK_Scalar1, 0, SK_Scalar1, 0);
75 path.quadTo(SK_Scalar1, SK_Scalar1, SK_Scalar1, SK_Scalar1 * 2);
76 path.cubicTo(SK_Scalar1, SK_Scalar1 * 2,
77 SK_Scalar1, SK_Scalar1 * 2,
78 SK_Scalar1, SK_Scalar1 * 2);
79 path.cubicTo(SK_Scalar1*2, SK_Scalar1 * 2,
80 SK_Scalar1*3, SK_Scalar1 * 2,
81 SK_Scalar1*4, SK_Scalar1 * 2);
82 meas.setPath(&path, false);
83 length = meas.getLength();
84 REPORTER_ASSERT(reporter, length == SK_Scalar1 * 6);
85 REPORTER_ASSERT(reporter, meas.getPosTan(SK_ScalarHalf, &position, &tangent));
86 REPORTER_ASSERT(reporter,
87 SkScalarNearlyEqual(position.fX, SK_ScalarHalf, SK_Scalar1 * 0.0001));
88 REPORTER_ASSERT(reporter, position.fY == 0);
89 REPORTER_ASSERT(reporter, tangent.fX == SK_Scalar1);
90 REPORTER_ASSERT(reporter, tangent.fY == 0);
91 REPORTER_ASSERT(reporter, meas.getPosTan(SK_Scalar1 * 2.5f, &position, &tangent));
92 REPORTER_ASSERT(reporter,
93 SkScalarNearlyEqual(position.fX, SK_Scalar1, SK_Scalar1 * 0.0001));
94 REPORTER_ASSERT(reporter,
95 SkScalarNearlyEqual(position.fY, SK_Scalar1 * 1.5f));
96 REPORTER_ASSERT(reporter, tangent.fX == 0);
97 REPORTER_ASSERT(reporter, tangent.fY == SK_Scalar1);
98 REPORTER_ASSERT(reporter, meas.getPosTan(SK_Scalar1 * 4.5f, &position, &tangent));
99 REPORTER_ASSERT(reporter,
100 SkScalarNearlyEqual(position.fX, SK_Scalar1 * 2.5f, SK_Scalar1 * 0.0001));
101 REPORTER_ASSERT(reporter,
102 SkScalarNearlyEqual(position.fY, SK_Scalar1 * 2.0f, SK_Scalar1 * 0.0001));
103 REPORTER_ASSERT(reporter, tangent.fX == SK_Scalar1);
104 REPORTER_ASSERT(reporter, tangent.fY == 0);
105
106 path.reset();
107 path.moveTo(0, 0);
108 path.lineTo(SK_Scalar1, 0);
109 path.moveTo(SK_Scalar1, SK_Scalar1);
110 path.moveTo(SK_Scalar1 * 2, SK_Scalar1 * 2);
111 path.lineTo(SK_Scalar1, SK_Scalar1 * 2);
112 meas.setPath(&path, false);
113 length = meas.getLength();
114 REPORTER_ASSERT(reporter, length == SK_Scalar1);
115 REPORTER_ASSERT(reporter, meas.getPosTan(SK_ScalarHalf, &position, &tangent));
116 REPORTER_ASSERT(reporter,
117 SkScalarNearlyEqual(position.fX, SK_ScalarHalf, SK_Scalar1 * 0.0001));
118 REPORTER_ASSERT(reporter, position.fY == 0);
119 REPORTER_ASSERT(reporter, tangent.fX == SK_Scalar1);
120 REPORTER_ASSERT(reporter, tangent.fY == 0);
121 meas.nextContour();
122 length = meas.getLength();
123 REPORTER_ASSERT(reporter, length == SK_Scalar1);
124 REPORTER_ASSERT(reporter, meas.getPosTan(SK_ScalarHalf, &position, &tangent));
125 REPORTER_ASSERT(reporter,
126 SkScalarNearlyEqual(position.fX, SK_Scalar1 * 1.5f, SK_Scalar1 * 0.0001));
127 REPORTER_ASSERT(reporter,
128 SkScalarNearlyEqual(position.fY, SK_Scalar1 * 2.0f, SK_Scalar1 * 0.0001));
129 REPORTER_ASSERT(reporter, tangent.fX == -SK_Scalar1);
130 REPORTER_ASSERT(reporter, tangent.fY == 0);
131 }
132
133 #include "TestClassDef.h"
134 DEFINE_TESTCLASS("PathMeasure", PathMeasureTestClass, TestPathMeasure)
135