feat(experimental): add selection boxes

src/core/primitives.c

@@ -91,15 +91,23 @@ VektorBBox vektor_polyline_get_bbox(VektorPrimitive prim) {
 }
 
 VektorBBox vektor_polygon_get_bbox(VektorPrimitive prim) {
-    float min_x, max_x, min_y, max_y;
-    for (size_t i = 0; i < prim.polygon->count; i++) {
+    V2 first = prim.polygon->points[0];
+
+    float min_x = first.x;
+    float max_x = first.x;
+    float min_y = first.y;
+    float max_y = first.y;
+
+    for (size_t i = 1; i < prim.polygon->count; i++) {
         V2 p = prim.polygon->points[i];
+
         min_x = fminf(min_x, p.x);
         min_y = fminf(min_y, p.y);
 
-        max_x = fminf(max_x, p.x);
-        max_y = fminf(max_y, p.y);
+        max_x = fmaxf(max_x, p.x);
+        max_y = fmaxf(max_y, p.y);
     }
+
     return (VektorBBox){(V2){min_x, min_y}, (V2){max_x, max_y}};
 }
 

src/core/raster.c

@@ -1,6 +1,7 @@
 #include "raster.h"
 #include "epoxy/gl.h"
 #include "primitives.h"
+#include "src/core/vector.h"
 #include "stddef.h"
 #include <stddef.h>
 
@@ -71,7 +72,7 @@ void vektor_rasterize(VertexBuffer* vb, VektorShapeBuffer* shapes) {
     vektor_edges_to_triangles(vb, &edges, shapes);
 }
 
-void vb_add_triangle(VertexBuffer* vb, V2 v0, V2 v1, V2 v2, VektorColor color) {
+void vektor_vb_add_triangle(VertexBuffer* vb, V2 v0, V2 v1, V2 v2, VektorColor color) {
     if (vb->count + 3 >= vb->capacity) {
         vb->capacity = vb->capacity ? vb->capacity * 2 : 8;
         vb->vertices = realloc(vb->vertices, sizeof(Vertex) * vb->capacity);
@@ -81,6 +82,22 @@ void vb_add_triangle(VertexBuffer* vb, V2 v0, V2 v1, V2 v2, VektorColor color) {
     vb->vertices[vb->count++] = (Vertex){v2, color};
 }
 
+void vektor_vb_add_quad(VertexBuffer* vb, V2 a, V2 b, VektorColor color) {
+
+    float minx = fminf(a.x, b.x);
+    float maxx = fmaxf(a.x, b.x);
+    float miny = fminf(a.y, b.y);
+    float maxy = fmaxf(a.y, b.y);
+
+    V2 tl = {minx, miny};
+    V2 bl = {minx, maxy};
+    V2 br = {maxx, maxy};
+    V2 tr = {maxx, miny};
+
+    vektor_vb_add_triangle(vb, tl, bl, br, color);
+    vektor_vb_add_triangle(vb, tl, br, tr, color);
+}
+
 void vektor_edge_to_triangles(VertexBuffer* vb, Edge e,
                               VektorShapeBuffer* shape_buffer) {
     float dx = e.p2.x - e.p1.x;
@@ -99,9 +116,9 @@ void vektor_edge_to_triangles(VertexBuffer* vb, Edge e,
     V2 v2 = {e.p2.x + px, e.p2.y + py};
     V2 v3 = {e.p2.x - px, e.p2.y - py};
 
-    vb_add_triangle(vb, v0, v1, v2,
+    vektor_vb_add_triangle(vb, v0, v1, v2,
                     shape_buffer->shapes[e.shape_id].style.stroke_color);
-    vb_add_triangle(vb, v2, v1, v3,
+    vektor_vb_add_triangle(vb, v2, v1, v3,
                     shape_buffer->shapes[e.shape_id].style.stroke_color);
 }
 

src/core/raster.h

@@ -38,7 +38,9 @@ typedef struct {
     size_t capacity;
 } VertexBuffer;
 
-void vb_add_triangle(VertexBuffer* vb, V2 v0, V2 v1, V2 v2, VektorColor color);
+void vektor_vb_add_triangle(VertexBuffer* vb, V2 v0, V2 v1, V2 v2, VektorColor color);
+void vektor_vb_add_quad(VertexBuffer* vb, V2 v0, V2 v1, VektorColor color);
+
 void vektor_edge_to_triangles(VertexBuffer* vb, Edge e,
                               VektorShapeBuffer* shape_buffer);
 void vektor_edges_to_triangles(VertexBuffer* vb, EdgeBuffer* edges,