From df06fe6084b1c1673348050309a3a0cb99b6634f Mon Sep 17 00:00:00 2001 From: Paul Duncan Date: Sun, 3 Feb 2019 15:10:44 -0500 Subject: add cluster support to gen-data.rb, show centroids on generated png --- km-draw.c | 25 +++++++++++++------------ 1 file changed, 13 insertions(+), 12 deletions(-) (limited to 'km-draw.c') diff --git a/km-draw.c b/km-draw.c index 7f59df3..ddf1b26 100644 --- a/km-draw.c +++ b/km-draw.c @@ -8,23 +8,24 @@ km_set_draw( uint8_t * const rgb, const size_t width, const size_t height, + const int dot_size, const uint32_t color ) { for (size_t i = 0; i < set->num_rows; i++) { const float *row = km_set_get_row(set, i); - const size_t x = (width - 1) * row[0], - y = (height - 1) * row[1], - ofs = 3 * (width * y + x); - if (x >= width || y >= height) { - die( - "km_set_draw(): point out of bounds (row: %zu, point: [%0.2f, %0.2f], pixel: %zux%zu, bounds: %zux%zu)", - i, row[0], row[1], x, y, width, height - ); + for (int yo = 0; yo < dot_size; yo++) { + for (int xo = 0; xo < dot_size; xo++) { + const int x = (width - 1) * row[0] - dot_size / 2 + xo, + y = (height - 1) * row[1] - dot_size / 2 + yo, + ofs = 3 * (width * y + x); + + if (x >= 0 && x < (int) width && y >= 0 && y < (int) height) { + rgb[ofs + 0] = (color & 0xff0000) >> 16; + rgb[ofs + 1] = (color & 0x00ff00) >> 8; + rgb[ofs + 2] = (color & 0x0000ff); + } + } } - - rgb[ofs + 0] = (color & 0xff0000) >> 16; - rgb[ofs + 1] = (color & 0x00ff00) >> 8; - rgb[ofs + 2] = (color & 0x0000ff); } } -- cgit v1.2.3