f47c217cc8
git-svn-id: http://skia.googlecode.com/svn/trunk@3502 2bbb7eff-a529-9590-31e7-b0007b416f81
54 lines
1.9 KiB
C++
54 lines
1.9 KiB
C++
// included by CubicParameterization.cpp
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// accesses internal functions to validate parameterized coefficients
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#include "Parameterization_Test.h"
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static void parameter_coeffs(const Cubic& cubic, double coeffs[coeff_count]) {
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#if USE_SYVESTER
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double ax, bx, cx, dx;
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if (try_alt)
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alt_set_abcd(&cubic[0].x, ax, bx, cx, dx);
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else
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set_abcd(&cubic[0].x, ax, bx, cx, dx);
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double ay, by, cy, dy;
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if (try_alt)
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alt_set_abcd(&cubic[0].y, ay, by, cy, dy);
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else
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set_abcd(&cubic[0].y, ay, by, cy, dy);
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calc_ABCD(ax, ay, coeffs);
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if (!try_alt) calc_bc(dx, bx, cx);
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if (!try_alt) calc_bc(dy, by, cy);
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#else
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double ax = cubic[0].x;
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double bx = cubic[1].x;
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double cx = cubic[2].x;
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double dx = cubic[3].x;
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double ay = cubic[0].y;
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double by = cubic[1].y;
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double cy = cubic[2].y;
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double dy = cubic[3].y;
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calc_ABCD(ax, bx, cx, dx, ay, by, cy, dy, coeffs);
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#endif
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for (int index = xx_coeff; index < coeff_count; ++index) {
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int procIndex = index - xx_coeff;
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coeffs[index] = (*calc_proc[procIndex])(ax, bx, cx, dx, ay, by, cy, dy);
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}
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}
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bool point_on_parameterized_curve(const Cubic& cubic, const _Point& point) {
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double coeffs[coeff_count];
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parameter_coeffs(cubic, coeffs);
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double xxx = coeffs[xxx_coeff] * point.x * point.x * point.x;
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double xxy = coeffs[xxy_coeff] * point.x * point.x * point.y;
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double xyy = coeffs[xyy_coeff] * point.x * point.y * point.y;
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double yyy = coeffs[yyy_coeff] * point.y * point.y * point.y;
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double xx = coeffs[ xx_coeff] * point.x * point.x;
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double xy = coeffs[ xy_coeff] * point.x * point.y;
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double yy = coeffs[ yy_coeff] * point.y * point.y;
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double x = coeffs[ x_coeff] * point.x;
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double y = coeffs[ y_coeff] * point.y;
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double c = coeffs[ c_coeff];
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double sum = xxx + xxy + xyy + yyy + xx + xy + yy + x + y + c;
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return approximately_zero(sum);
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}
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