6680fb1dc0
git-svn-id: http://skia.googlecode.com/svn/trunk@3151 2bbb7eff-a529-9590-31e7-b0007b416f81
33 lines
955 B
C++
33 lines
955 B
C++
#include "CurveIntersection.h"
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#include "LineUtilities.h"
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bool implicitLine(const _Line& line, double& slope, double& axisIntercept) {
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_Point delta;
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tangent(line, delta);
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bool moreHorizontal = fabs(delta.x) > fabs(delta.y);
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if (moreHorizontal) {
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slope = delta.y / delta.x;
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axisIntercept = line[0].y - slope * line[0].x;
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} else {
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slope = delta.x / delta.y;
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axisIntercept = line[0].x - slope * line[0].y;
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}
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return moreHorizontal;
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}
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int reduceOrder(const _Line& line, _Line& reduced) {
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reduced[0] = line[0];
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int different = line[0] != line[1];
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reduced[1] = line[different];
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return 1 + different;
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}
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void sub_divide(const _Line& line, double t1, double t2, _Line& dst) {
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_Point delta;
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tangent(line, delta);
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dst[0].x = line[0].x - t1 * delta.x;
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dst[0].y = line[0].y - t1 * delta.y;
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dst[1].x = line[0].x - t2 * delta.x;
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dst[1].y = line[0].y - t2 * delta.y;
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}
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