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catmull-rom: add special case for evaluating straight segments at 0 or 1

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This commit is contained in:
Alberto Griggio 2018-08-17 15:52:55 +02:00
parent d6ca3d65aa
commit ef57c5da00
1 changed files with 37 additions and 28 deletions
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9
rtengine/diagonalcurves.cc
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@ -320,6 +320,14 @@ inline void catmull_rom_spline(int n_points,
res_x.push_back(p1_x);
res_y.push_back(p1_y);
// special case, a segment at 0 or 1 is computed exactly
if (p1_y == p2_y && (p1_y == 0 || p1_y == 1)) {
for (i = 1; i < n_points-1; ++i) {
t = p1_x + space * i;
res_x.push_back(t);
res_y.push_back(p1_y);
}
} else {
for (i = 1; i < n_points-1; ++i) {
t = t1 + space * i;
@ -356,6 +364,7 @@ inline void catmull_rom_spline(int n_points,
res_x.push_back(C_x);
res_y.push_back(C_y);
}
}
res_x.push_back(p2_x);
res_y.push_back(p2_y);