fix: add bevel edge case to miter join

src/core/modifier.c

@@ -1,11 +1,8 @@
 #include "modifier.h"
 
 VektorShapeNode vektor_shapenode_new(VektorShape shape) {
-    VektorShapeNode node = (VektorShapeNode) {
-        .base = shape,
-        .modifier_count = 0,
-        .evaluated = shape
-    };
+    VektorShapeNode node = (VektorShapeNode){
+        .base = shape, .modifier_count = 0, .evaluated = shape};
     return node;
 }
 
@@ -14,7 +11,8 @@ VektorShape* vektor_shapenode_get_evaluated(VektorShapeNode* shapeNode) {
     return &shapeNode->evaluated;
 }
 
-void vektor_shapenodebuf_add(VektorShapeNodeBuffer* buffer, VektorShapeNode node) {
+void vektor_shapenodebuf_add(VektorShapeNodeBuffer* buffer,
+                             VektorShapeNode node) {
     if (buffer->count >= buffer->capacity) {
         buffer->capacity = buffer->capacity ? buffer->capacity * 2 : 4;
         buffer->nodes =

src/core/modifier.h

@@ -3,9 +3,7 @@
 
 #include "src/core/primitives.h"
 
-typedef enum {
-    VEKTOR_MODIFIER_BEVEL
-} VektorModifierType;
+typedef enum { VEKTOR_MODIFIER_BEVEL } VektorModifierType;
 
 typedef struct VektorModifier {
     VektorModifierType type;
@@ -35,10 +33,13 @@ typedef struct VektorShapeNodeBuffer {
 
 VektorShapeNode vektor_shapenode_new(VektorShape shape);
 VektorShape* vektor_shapenode_get_evaluated(VektorShapeNode* shapeNode);
-void vektor_shapenode_modifier_add(VektorShapeNode* shapeNode, VektorModifier* mod);
-void vektor_shapenode_modifier_remove(VektorShapeNode* shapeNode, VektorModifier* mod);
+void vektor_shapenode_modifier_add(VektorShapeNode* shapeNode,
+                                   VektorModifier* mod);
+void vektor_shapenode_modifier_remove(VektorShapeNode* shapeNode,
+                                      VektorModifier* mod);
 void vektor_shapenode_free(VektorShapeNode* shapeNode);
 
-void vektor_shapenodebuf_add(VektorShapeNodeBuffer* buffer, VektorShapeNode node);
+void vektor_shapenodebuf_add(VektorShapeNodeBuffer* buffer,
+                             VektorShapeNode node);
 
 #endif

src/core/raster.c

@@ -41,7 +41,7 @@ void vektor_polygon_tessellate(EdgeBuffer* buffer, VektorPolygon* polygon,
 void vektor_circle_tessellate(EdgeBuffer* buffer, VektorCircle* circle,
                               size_t j, double scale) {
     double err = 0.0025;
-    size_t res = MIN(PI * sqrt((scale * circle->radius) / (2 * err)), 20);
+    size_t res = PI * sqrt((scale * circle->radius) / (2 * err));
     for (size_t i = 0; i < res; i++) {
         double theta1 = (2 * PI * i) / res;
         double theta2 = (2 * PI * (i + 1)) / res;
@@ -71,7 +71,7 @@ void vektor_rectangle_tessellate(EdgeBuffer* buffer, VektorRectangle* rct,
 }
 
 void vektor_vb_rasterize(VertexBuffer* vb, VektorShapeNodeBuffer* nodebuf,
-                      double scale) {
+                         double scale) {
     for (size_t i = 0; i < nodebuf->count; i++) {
         EdgeBuffer edges = {0};
         VektorPrimitive* p = &nodebuf->nodes[i].base.primitive;
@@ -104,7 +104,6 @@ void vektor_vb_rasterize(VertexBuffer* vb, VektorShapeNodeBuffer* nodebuf,
             break;
         }
     }
-
 }
 
 void vektor_vb_add_triangle(VertexBuffer* vb, V2 v0, V2 v1, V2 v2,
@@ -202,6 +201,24 @@ void vektor_edges_to_triangles(VertexBuffer* vb, EdgeBuffer* edges,
         V2 v22 = vec2_add(e2.p2, off2);
         V2 v23 = vec2_sub(e2.p2, off2);
 
+        V2 outer1 = vec2_add(corner, off1);
+        V2 outer2 = vec2_add(corner, off2);
+
+        V2 inner1 = vec2_sub(corner, off1);
+        V2 inner2 = vec2_sub(corner, off2);
+
+        float cos_theta = vec2_dot(d1, d2);
+        float sin_half = sqrtf((1.0f - cos_theta) * 0.5f);
+        float miter_len = hw / sin_half;
+
+        if (miter_len > 4.0 * hw || miter_len < 1.05 * hw) {
+            vektor_vb_add_triangle(vb, outer1, corner, outer2,
+                                   style.stroke_color);
+            vektor_vb_add_triangle(vb, inner1, corner, inner2,
+                                   style.stroke_color);
+            continue;
+        }
+
         V2 outer_miter = line_intersection(vec2_add(corner, off1), d1,
                                            vec2_add(corner, off2), d2);
 

src/core/raster.h

@@ -53,6 +53,6 @@ void vektor_edge_to_triangles(VertexBuffer* vb, Edge e,
 void vektor_edges_to_triangles(VertexBuffer* vb, EdgeBuffer* edges,
                                M33* transform, VektorStyle style, bool closed);
 void vektor_vb_rasterize(VertexBuffer* vb, VektorShapeNodeBuffer* shapes,
-                      double scale);
+                         double scale);
 
 #endif // RASTER_H_