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better interface for clip_line

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This commit is contained in:
Artem Pavlenko 2006-01-26 16:41:15 +00:00
parent a6f96ea5c1
commit 4ed7158908
1 changed files with 3 additions and 3 deletions
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6
include/geom_util.hpp
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@ -47,19 +47,19 @@ namespace mapnik
}
template <typename T,typename Image>
bool clip_line(T& x0,T& y0,T& x1,T& y1,const Image* image)
bool clip_line(T& x0,T& y0,T& x1,T& y1,Envelope<T> const& box)
{
double tmin=0.0;
double tmax=1.0;
double dx=x1-x0;
if (clip_test<double>(-dx,x0,tmin,tmax))
{
if (clip_test<double>(dx,image->width()-x0,tmin,tmax))
if (clip_test<double>(dx,box.width()-x0,tmin,tmax))
{
double dy=y1-y0;
if (clip_test<double>(-dy,y0,tmin,tmax))
{
if (clip_test<double>(dy,image->height()-y0,tmin,tmax))
if (clip_test<double>(dy,box.height()-y0,tmin,tmax))
{
if (tmax<1.0)
{