[postgis-users] AsSvg bug fixes

[Olivier Courtin]

Hi,

Some little fixes for AsSvg function (from postgis cvs) :

1) Y axe in SVG is reverse (i.e 0,0 point in upper left)
2) Relative path correction in print_svg_path_rel
 



--- lwgeom_svg.c	2004-10-15 13:48:48.000000000 +0200
+++ patched_lwgeom_svg.c	2004-10-25 15:37:47.000000000 +0200
@@ -192,7 +192,7 @@
 
 	sprintf(x, "%.*f", precision, pt->x);
 	trim_trailing_zeros(x);
-	sprintf(y, "%.*f", precision, pt->y);
+	sprintf(y, "%.*f", precision, pt->y * -1);
 	trim_trailing_zeros(y);
 
 	sprintf(temp, "x=\"%s\" y=\"%s\"", x, y);
@@ -211,7 +211,7 @@
 
 	sprintf(x, "%.*f", precision, pt->x);
 	trim_trailing_zeros(x);
-	sprintf(y, "%.*f", precision, pt->y);
+	sprintf(y, "%.*f", precision, pt->y * -1);
 	trim_trailing_zeros(y);
 
 	sprintf(temp, "cx=\"%s\" cy=\"%s\"", x, y);
@@ -238,7 +238,7 @@
 		}
 		sprintf(x, "%.*f", precision, pt->x);
 		trim_trailing_zeros(x);
-		sprintf(y, "%.*f", precision, pt->y);
+		sprintf(y, "%.*f", precision, pt->y * -1);
 		trim_trailing_zeros(y);
 		result+= sprintf(result,"%s %s", x, y);
 	}
@@ -259,7 +259,7 @@
 
 	sprintf(x, "%.*f", precision, pt->x);
 	trim_trailing_zeros(x);
-	sprintf(y, "%.*f", precision, pt->y);
+	sprintf(y, "%.*f", precision, pt->y * -1);
 	trim_trailing_zeros(y);
 
 	result += sprintf(result,"%s %s l", x, y); 
@@ -268,9 +268,9 @@
 	for (u=1; u<pa->npoints; u++)
 	{
 		pt = (POINT2D *)getPoint(pa, u);
-		sprintf(x, "%.*f", precision, pt->x);
+		sprintf(x, "%.*f", precision, pt->x - lpt->x);
 		trim_trailing_zeros(x);
-		sprintf(y, "%.*f", precision, pt->y);
+		sprintf(y, "%.*f", precision, (pt->y - lpt->y) * -1);
 		trim_trailing_zeros(y);
 		result+= sprintf(result," %s %s", x, y);
 		lpt = pt;



HTH :)

--
Ol