feat: hit on primitives

client/world/renderer_draw_primitives.go

@@ -29,10 +29,14 @@ func (w *World) drawPointInTile(drawer PrimitiveDrawer, plan RenderPlan, td Tile
 
 		drawer.AddPoint(float64(px), float64(py), rPx)
 
-		// For points we use Fill if fill is configured, otherwise Stroke if stroke is configured.
-		if lastStyle.FillColor != nil {
+		fill := alphaNonZero(lastStyle.FillColor)
+		stroke := alphaNonZero(lastStyle.StrokeColor)
+
+		if fill {
 			drawer.Fill()
-		} else if lastStyle.StrokeColor != nil {
+		}
+		if stroke {
+			// Stroke must be last when both are present.
 			drawer.Stroke()
 		}
 	}
@@ -58,9 +62,14 @@ func (w *World) drawCircleInTile(drawer PrimitiveDrawer, plan RenderPlan, td Til
 
 		drawer.AddCircle(float64(cxPx), float64(cyPx), float64(rPx))
 
-		if lastStyle.FillColor != nil {
+		fill := alphaNonZero(lastStyle.FillColor)
+		stroke := alphaNonZero(lastStyle.StrokeColor)
+
+		if fill {
 			drawer.Fill()
-		} else if lastStyle.StrokeColor != nil {
+		}
+		if stroke {
+			// Stroke must be last when both are present.
 			drawer.Stroke()
 		}
 	}