From 132830dc2d55f09d48011efa39cf9e81095e6ce7 Mon Sep 17 00:00:00 2001 From: Tim Date: Sat, 24 Dec 2022 15:11:26 +0100 Subject: [PATCH] Add files via upload --- olive.c | 44 +++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 43 insertions(+), 1 deletion(-) diff --git a/olive.c b/olive.c index c452afc..086338f 100644 --- a/olive.c +++ b/olive.c @@ -934,11 +934,53 @@ OLIVECDEF void olivec_sprite_copy_bilinear(Olivec_Canvas oc, int x, int y, int w } } + +OLIVECDEF double OLIVEC_BINOMIAL_COEFFS(int n, int i) +{ + double result = 1; + for(int j = 1; j <= i; j++) + { + result *= (n-i+j) /(double)j; + } + return result; +} + +OLIVECDEF void olivec_bezier(Olivec_Canvas oc, int degree, uint32_t color, + int x1, int y1, int cx1, int cy1, + int cx2, int cy2, int x2, int y2) +{ + // TODO: Make the degree work for other than cubic. + // TODO: test case for bezier curves + + int pointsx[4] = {x1, cx1, cx2, x2}; + int pointsy[4] = {y1, cy1, cy2, y2}; + double px = 0, py = 0; + // TODO: find a better iteration step size. + double istep = 0.001; + double scale_factor = istep; + double x, y; + + while(scale_factor < 1) + { + x = 0, y = 0; + for(int i = 0; i <= degree; i++) + { + double b = OLIVEC_BINOMIAL_COEFFS(degree, i) * pow(1-scale_factor, degree - i) * pow(scale_factor, i); + x += b*(double) pointsx[i]; + y += b*(double) pointsy[i]; + } + + OLIVEC_PIXEL(oc,(int) x,(int) y) = color; + px = x; py = y; + + scale_factor += istep; + } +} + #endif // OLIVEC_IMPLEMENTATION // TODO: Benchmarking // TODO: SIMD implementations -// TODO: bezier curves // TODO: olivec_ring // TODO: fuzzer // TODO: Stencil