07393cab57
Paths contain lines, quads, and cubics, which are collectively curves. To work with path intersections, intermediary curves are constructed. For now, those intermediates use doubles to guarantee sufficient precision. The DVector, DPoint, DLine, DQuad, and DCubic structs encapsulate these intermediate curves. The DRect and DTriangle structs are created to describe intersectable areas of interest. The Bounds struct inherits from SkRect to create a SkScalar-based rectangle that intersects shared edges. This also includes common math equalities and debugging that the remainder of path ops builds on, as well as a temporary top-level interface in include/pathops/SkPathOps.h. Review URL: https://codereview.chromium.org/12827020 git-svn-id: http://skia.googlecode.com/svn/trunk@8551 2bbb7eff-a529-9590-31e7-b0007b416f81
55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
/*
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* Copyright 2012 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkPathOpsLine.h"
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#include "Test.h"
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static const SkDLine tests[] = {
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{{{2, 1}, {2, 1}}},
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{{{2, 1}, {1, 1}}},
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{{{2, 1}, {2, 2}}},
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{{{1, 1}, {2, 2}}},
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{{{3, 0}, {2, 1}}},
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{{{3, 2}, {1, 1}}},
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};
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static const SkDPoint left[] = {
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{2, 1},
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{1, 0},
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{1, 1},
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{1, 2},
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{2, 0},
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{2, 1}
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};
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static const size_t tests_count = sizeof(tests) / sizeof(tests[0]);
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static void DLineTest(skiatest::Reporter* reporter) {
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for (size_t index = 0; index < tests_count; ++index) {
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const SkDLine& line = tests[index];
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SkDLine line2;
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SkPoint pts[2] = {line[0].asSkPoint(), line[1].asSkPoint()};
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line2.set(pts);
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REPORTER_ASSERT(reporter, line[0] == line2[0] && line[1] == line2[1]);
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const SkDPoint& pt = left[index];
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double result = line.isLeft(pt);
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if ((result <= 0 && index >= 1) || (result < 0 && index == 0)) {
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SkDebugf("%s [%d] expected left\n", __FUNCTION__, index);
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REPORTER_ASSERT(reporter, 0);
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}
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line2 = line.subDivide(1, 0);
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REPORTER_ASSERT(reporter, line[0] == line2[1] && line[1] == line2[0]);
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line2 = SkDLine::SubDivide(pts, 1, 0);
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REPORTER_ASSERT(reporter, line[0] == line2[1] && line[1] == line2[0]);
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SkDPoint mid = line.xyAtT(.5);
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REPORTER_ASSERT(reporter, approximately_equal((line[0].fX + line[1].fX) / 2, mid.fX));
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REPORTER_ASSERT(reporter, approximately_equal((line[0].fY + line[1].fY) / 2, mid.fY));
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}
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}
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#include "TestClassDef.h"
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DEFINE_TESTCLASS("PathOpsLineUtilities", PathOpsLineUtilitiesClass, DLineTest)
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