mapdraw, ...: simplify pointObj initializers

With some compile-time options, pointObj has less than 4 fields, so
this patch also fixes the build with those options.

Author: MaxKellermann

Diff for: mapdraw.c

@@ -1956,7 +1956,7 @@ int polygonLayerDrawShape(mapObj *map, imageObj *image, layerObj *layer,
 {
 
   int c = shape->classindex;
-  pointObj annopnt = {0,0,0,0}; // initialize
+  pointObj annopnt = {0}; // initialize
   int i;
 
   if(MS_DRAW_FEATURES(drawmode)) {

Diff for: maplabel.c

@@ -881,7 +881,7 @@ int msGetTextSymbolSize(mapObj *map, textSymbolObj *ts, rectObj *r) {
 
 pointObj get_metrics(pointObj *p, int position, textPathObj *tp, int ox, int oy, double rotation, int buffer, label_bounds *bounds)
 {
-  pointObj q = {0,0,0,0}; // initialize
+  pointObj q = {0}; // initialize
   double x1=0, y1=0, x2=0, y2=0;
   double sin_a,cos_a;
   double w, h, x, y;

Diff for: mappostgis.c

@@ -752,7 +752,7 @@ arcSegmentSide(const pointObj *p1, const pointObj *p2, const pointObj *q)
 int
 arcCircleCenter(const pointObj *p1, const pointObj *p2, const pointObj *p3, pointObj *center, double *radius)
 {
-  pointObj c = {0,0,0,0}; // initialize
+  pointObj c = {0}; // initialize
   double dx21, dy21, dx31, dy31, h21, h31, d, r;
 
   /* Circle is closed, so p2 must be opposite p1 & p3. */

Diff for: mapprimitive.c

@@ -1133,7 +1133,7 @@ void msTransformPixelToShape(shapeObj *shape, rectObj extent, double cellsize)
 */
 static pointObj generateLineIntersection(pointObj a, pointObj b, pointObj c, pointObj d)
 {
-  pointObj p = {0,0,0,0}; // initialize
+  pointObj p = {0}; // initialize
   double r;
   double denominator, numerator;
 

Diff for: mapproject.c

@@ -1211,7 +1211,7 @@ static int msProjectShapeShouldDoLineCutting(reprojectionObj* reprojector)
         return MS_FALSE;
     }
 
-    pointObj p = {0,0,0,0}; // initialize
+    pointObj p = {0}; // initialize
     double invgt0 = out->gt.need_geotransform ? out->gt.invgeotransform[0] : 0.0;
     double invgt1 = out->gt.need_geotransform ? out->gt.invgeotransform[1] : 1.0;
     double invgt3 = out->gt.need_geotransform ? out->gt.invgeotransform[3] : 0.0;

Diff for: mapsmoothing.c

@@ -142,7 +142,7 @@ static int processShapePathDistance(shapeObj *shape, int force)
 
     while ((res = nextLineWindow(&lw)) != MS_DONE) {
       double ratio = 0;
-      pointObj point = {0,0,0,0}; // initialize
+      pointObj point = {0}; // initialize
 
       if (lw.lineIsRing && lw.pos==lw.line->numpoints-1) {
         point = newShape->line[i].point[0];
@@ -261,7 +261,7 @@ shapeObj* msSmoothShapeSIA(shapeObj *shape, int ss, int si, char *preprocessing)
 
       while ((res = nextLineWindow(&lw)) != MS_DONE) {
         double sum_x=0, sum_y=0, sum = 0;
-        pointObj point = {0,0,0,0}; // initialize
+        pointObj point = {0}; // initialize
         int k = 0;
 
         if (res == MS_FALSE) { /* invalid window */

Diff for: maptemplate.c

@@ -1728,8 +1728,8 @@ static int processShplabelTag(layerObj *layer, char **line, shapeObj *origshape)
     }
 
     if(labelposvalid == MS_TRUE) {
-      pointObj p1 = {0,0,0,0}; // initialize
-      pointObj p2 = {0,0,0,0};
+      pointObj p1 = {0}; // initialize
+      pointObj p2 = {0};
       int label_offset_x, label_offset_y;
       labelObj *label=NULL;
       label_bounds lbounds;