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Patch from Mark Wooding to introduce a draw_thick_line() function in

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the drawing API, for use by Loopy. It's optional: drawing.c will
construct an acceptable alternative using a filled polygon if the
front end doesn't provide it.

Net and Netslide previously had static functions called
draw_thick_line(), whose claim to the name is less justified and so
they've been renamed.

[originally from svn r8962]
This commit is contained in:
Simon Tatham
2010-05-29 15:43:46 +00:00
parent ef6e78c6ac
commit 9cd182ffa9
7 changed files with 95 additions and 25 deletions
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28
drawing.c
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@ -87,6 +87,34 @@ void draw_line(drawing *dr, int x1, int y1, int x2, int y2, int colour)
dr->api->draw_line(dr->handle, x1, y1, x2, y2, colour);
}
void draw_thick_line(drawing *dr, float thickness,
float x1, float y1, float x2, float y2, int colour)
{
if (dr->api->draw_thick_line) {
dr->api->draw_thick_line(dr->handle, thickness,
x1, y1, x2, y2, colour);
} else {
/* We'll fake it up with a filled polygon. The tweak to the
* thickness empirically compensates for rounding errors, because
* polygon rendering uses integer coordinates.
*/
float len = sqrt((x2 - x1)*(x2 - x1) + (y2 - y1)*(y2 - y1));
float tvhatx = (x2 - x1)/len * (thickness/2 - 0.2);
float tvhaty = (y2 - y1)/len * (thickness/2 - 0.2);
int p[8];
p[0] = x1 - tvhaty;
p[1] = y1 + tvhatx;
p[2] = x2 - tvhaty;
p[3] = y2 + tvhatx;
p[4] = x2 + tvhaty;
p[5] = y2 - tvhatx;
p[6] = x1 + tvhaty;
p[7] = y1 - tvhatx;
dr->api->draw_polygon(dr->handle, p, 4, colour, colour);
}
}
void draw_polygon(drawing *dr, int *coords, int npoints,
int fillcolour, int outlinecolour)
{