template<class VertexSource> int renderPolygonHatches(imageObj *img,VertexSource &clipper, colorObj *color)
{
if(img->format->renderer == MS_RENDER_WITH_AGG) {
AGG2Renderer *r = AGG_RENDERER(img);
r->m_rasterizer_aa_gamma.reset();
r->m_rasterizer_aa_gamma.filling_rule(mapserver::fill_non_zero);
r->m_rasterizer_aa_gamma.add_path(clipper);
r->m_renderer_scanline.color(aggColor(color));
mapserver::render_scanlines(r->m_rasterizer_aa_gamma, r->sl_poly, r->m_renderer_scanline);
} else {
shapeObj shape;
msInitShape(&shape);
int allocated = 20;
lineObj line;
shape.line = &line;
shape.numlines = 1;
shape.line[0].point = (pointObj*)msSmallCalloc(allocated,sizeof(pointObj));
shape.line[0].numpoints = 0;
double x=0,y=0;
unsigned int cmd;
clipper.rewind(0);
while((cmd = clipper.vertex(&x,&y)) != mapserver::path_cmd_stop) {
switch(cmd) {
case mapserver::path_cmd_line_to:
if(shape.line[0].numpoints == allocated) {
allocated *= 2;
shape.line[0].point = (pointObj*)msSmallRealloc(shape.line[0].point, allocated*sizeof(pointObj));
}
shape.line[0].point[shape.line[0].numpoints].x = x;
shape.line[0].point[shape.line[0].numpoints].y = y;
shape.line[0].numpoints++;
break;
case mapserver::path_cmd_move_to:
shape.line[0].point[0].x = x;
shape.line[0].point[0].y = y;
shape.line[0].numpoints = 1;
break;
case mapserver::path_cmd_end_poly|mapserver::path_flags_close:
if(shape.line[0].numpoints > 2) {
if(UNLIKELY(MS_FAILURE == MS_IMAGE_RENDERER(img)->renderPolygon(img,&shape,color))) {
free(shape.line[0].point);
return MS_FAILURE;
}
}
break;
default:
assert(0); //WTF?
}
}
free(shape.line[0].point);
}
return MS_SUCCESS;
}
double path_length(VertexSource& vs, unsigned path_id = 0)
{
double len = 0.0;
double start_x = 0.0;
double start_y = 0.0;
double x1 = 0.0;
double y1 = 0.0;
double x2 = 0.0;
double y2 = 0.0;
bool first = true;
unsigned cmd;
vs.rewind(path_id);
while(!is_stop(cmd = vs.vertex(&x2, &y2)))
{
if(is_vertex(cmd))
{
if(first || is_move_to(cmd))
{
start_x = x2;
start_y = y2;
}
else
{
len += calc_distance(x1, y1, x2, y2);
}
x1 = x2;
y1 = y2;
first = false;
}
else
{
if(is_close(cmd) && !first)
{
len += calc_distance(x1, y1, start_x, start_y);
}
}
}
return len;
}
void add_path(VertexSource& vs, unsigned path_id=0)
{
double x;
double y;
unsigned flag;
vs.rewind(path_id);
while(!agg::is_stop(flag = vs.vertex(&x, &y)))
{
if(agg::is_vertex(flag))
{
if(agg::is_move_to(flag))
{
move_to(int(x), int(y));
}
else
{
line_to(int(x), int(y));
}
}
}
}