| #include "CurveIntersection.h" |
| #include "LineUtilities.h" |
| |
| bool implicitLine(const _Line& line, double& slope, double& axisIntercept) { |
| _Point delta; |
| tangent(line, delta); |
| bool moreHorizontal = fabs(delta.x) > fabs(delta.y); |
| if (moreHorizontal) { |
| slope = delta.y / delta.x; |
| axisIntercept = line[0].y - slope * line[0].x; |
| } else { |
| slope = delta.x / delta.y; |
| axisIntercept = line[0].x - slope * line[0].y; |
| } |
| return moreHorizontal; |
| } |
| |
| int reduceOrder(const _Line& line, _Line& reduced) { |
| reduced[0] = line[0]; |
| int different = line[0] != line[1]; |
| reduced[1] = line[different]; |
| return 1 + different; |
| } |
| |
| void sub_divide(const _Line& line, double t1, double t2, _Line& dst) { |
| _Point delta; |
| tangent(line, delta); |
| dst[0].x = line[0].x - t1 * delta.x; |
| dst[0].y = line[0].y - t1 * delta.y; |
| dst[1].x = line[0].x - t2 * delta.x; |
| dst[1].y = line[0].y - t2 * delta.y; |
| } |