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 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
