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Fix for the problem that cairo draws over the given path on very sharp angles 

Signed-off-by: Julien Danjou <julien@danjou.info>
This commit is contained in:
marco candrian 2008-01-26 15:15:31 +01:00 committed by Julien Danjou
parent 37b4f62258
commit 836942eb4c
1 changed files with 7 additions and 5 deletions
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12
common/draw.c
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@ -169,6 +169,8 @@ draw_graph_init(DrawCtx *ctx, cairo_surface_t **pp_surface, cairo_t **pp_cr)
cairo_set_antialias(*pp_cr, CAIRO_ANTIALIAS_NONE);
cairo_set_line_width(*pp_cr, 1.0);
/* without it, it can draw over the path on sharp angles (...too long lines) */
cairo_set_line_join (*pp_cr, CAIRO_LINE_JOIN_ROUND);
}
void
@ -179,9 +181,8 @@ draw_graph_end(cairo_surface_t *surface, cairo_t *cr)
}
/* draws a graph; it takes the line-lengths from *from and *to. It cycles
* backwards through those arrays (what have the lenght of w), beginning at
* position cur_index, until h_index is reached again (wrapped around). */
* backwards through those arrays (what have the length of w), beginning at
* position cur_index, until cur_index is reached again (wrapped around). */
void
draw_graph(cairo_t *cr, int x, int y, int w, int *from, int *to, int cur_index, XColor color)
{
@ -207,12 +208,13 @@ draw_graph_line(cairo_t *cr, int x, int y, int w, int *to, int cur_index, XColor
int flag = 0; /* used to prevent drawing a line from 0 to 0 values */
cairo_set_source_rgb(cr, color.red / 65535.0, color.green / 65535.0, color.blue / 65535.0);
/* XXX x - 1 (on the border actually), for whatever reason... */
/* x-1 (on the border), paints *from* the last point (... not included itself) */
/* makes sense when you assume there is already some line drawn to it. */
cairo_move_to(cr, x - 1, y - to[cur_index]);
for (i = 0; i < w; i++)
{
if (to[cur_index] >= 1)
if (to[cur_index] > 0)
{
cairo_line_to(cr, x, y - to[cur_index]);
flag = 1;