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fix: add bevel edge case to miter join

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This commit is contained in:
Froxwin
2026-03-14 12:31:03 +00:00
parent bd586cda6a
commit 31b2196976
6 changed files with 84 additions and 50 deletions
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70
src/application/applicationstate.c
View File

@@ -118,13 +118,15 @@ begin_click_dispatch:
VektorStyle style = (VektorStyle){
.stroke_color = state->currentColor, .stroke_width = 0.01};
vektor_shapenodebuf_add(
state->shapeBuffer, vektor_shapenode_new(vektor_shape_new(linePrimitive, style, 0)));
vektor_shapenodebuf_add(state->shapeBuffer,
vektor_shapenode_new(vektor_shape_new(
linePrimitive, style, 0)));
state->selectedShape =
&(state->shapeBuffer->nodes[state->shapeBuffer->count - 1]);
} else if (state->selectedShape->base.primitive.kind != VEKTOR_POLYLINE) {
} else if (state->selectedShape->base.primitive.kind !=
VEKTOR_POLYLINE) {
// selecting a tool resets the selection, so this condition
// should not happen
g_warning("Invalid selected primitive; polyline expected");
@@ -134,7 +136,8 @@ begin_click_dispatch:
vektor_polyline_add_point(state->selectedShape->base.primitive.polyline,
pos);
state->selectedShape->base.bbox = vektor_primitive_get_bbox(state->selectedShape->base.primitive);
state->selectedShape->base.bbox =
vektor_primitive_get_bbox(state->selectedShape->base.primitive);
// polyline's handle count is not fixed, so we have to add them manually
vektor_shape_add_handle(&state->selectedShape->base, pos);
@@ -148,20 +151,24 @@ begin_click_dispatch:
(VektorPrimitive){.kind = VEKTOR_POLYGON, .polygon = polygon};
VektorStyle style = (VektorStyle){
.stroke_color = state->currentColor, .stroke_width = 0.01};
vektor_shapenodebuf_add(
state->shapeBuffer, vektor_shapenode_new(vektor_shape_new(polygonPrimitive, style, 0)));
vektor_shapenodebuf_add(state->shapeBuffer,
vektor_shapenode_new(vektor_shape_new(
polygonPrimitive, style, 0)));
state->selectedShape =
&(state->shapeBuffer->nodes[state->shapeBuffer->count - 1]);
} else if (state->selectedShape->base.primitive.kind != VEKTOR_POLYGON) {
} else if (state->selectedShape->base.primitive.kind !=
VEKTOR_POLYGON) {
g_warning("Invalid selected primitive; polygon expected");
vektor_appstate_deselect_shape(state);
goto begin_click_dispatch; // retry
}
vektor_polygon_add_point(state->selectedShape->base.primitive.polygon, pos);
state->selectedShape->base.bbox = vektor_primitive_get_bbox(state->selectedShape->base.primitive);
vektor_polygon_add_point(state->selectedShape->base.primitive.polygon,
pos);
state->selectedShape->base.bbox =
vektor_primitive_get_bbox(state->selectedShape->base.primitive);
// polygon's handle count is not fixed, so we have to add them manually
vektor_shape_add_handle(&state->selectedShape->base, pos);
@@ -174,19 +181,24 @@ begin_click_dispatch:
VektorStyle style = (VektorStyle){.stroke_color = state->currentColor,
.stroke_width = 0.01};
vektor_shapenodebuf_add(
state->shapeBuffer, vektor_shapenode_new(vektor_shape_new(circlePrimitive, style, 0)));
state->shapeBuffer,
vektor_shapenode_new(vektor_shape_new(circlePrimitive, style, 0)));
state->selectedShape =
&(state->shapeBuffer->nodes[state->shapeBuffer->count - 1]);
vektor_circle_free(circle);
vektor_circle_set_center(&state->selectedShape->base.primitive.circle, pos);
vektor_circle_set_radius(&state->selectedShape->base.primitive.circle, 0.1f);
vektor_circle_set_center(&state->selectedShape->base.primitive.circle,
pos);
vektor_circle_set_radius(&state->selectedShape->base.primitive.circle,
0.1f);
state->selectedShape->base.bbox = vektor_primitive_get_bbox(state->selectedShape->base.primitive);
state->selectedShape->base.bbox =
vektor_primitive_get_bbox(state->selectedShape->base.primitive);
vektor_circle_create_handles(&state->selectedShape->base.primitive.circle,
vektor_circle_create_handles(
&state->selectedShape->base.primitive.circle,
&state->selectedShape->base.handles,
&state->selectedShape->base.handleCount);
} else if (state->selectedTool == VektorRectangleTool) {
@@ -197,22 +209,26 @@ begin_click_dispatch:
VektorStyle style = (VektorStyle){.stroke_color = state->currentColor,
.stroke_width = 0.01};
vektor_shapenodebuf_add(
state->shapeBuffer, vektor_shapenode_new(vektor_shape_new(rectPrimitive, style, 0)));
state->shapeBuffer,
vektor_shapenode_new(vektor_shape_new(rectPrimitive, style, 0)));
state->selectedShape =
&(state->shapeBuffer->nodes[state->shapeBuffer->count - 1]);
vektor_rectangle_free(rect);
vektor_rectangle_set_start(&state->selectedShape->base.primitive.rectangle,
pos);
vektor_rectangle_set_end(&state->selectedShape->base.primitive.rectangle,
vektor_rectangle_set_start(
&state->selectedShape->base.primitive.rectangle, pos);
vektor_rectangle_set_end(
&state->selectedShape->base.primitive.rectangle,
vec2_add(pos, (V2){0.1f, 0.1f}));
vektor_rectangle_create_handles(
&state->selectedShape->base.primitive.rectangle,
&state->selectedShape->base.handles, &state->selectedShape->base.handleCount);
&state->selectedShape->base.handles,
&state->selectedShape->base.handleCount);
state->selectedShape->base.bbox = vektor_primitive_get_bbox(state->selectedShape->base.primitive);
state->selectedShape->base.bbox =
vektor_primitive_get_bbox(state->selectedShape->base.primitive);
} else if (state->selectedTool == VektorSelectionTool) {
for (size_t i = 0; i < state->shapeBuffer->count; i++) {
@@ -247,14 +263,15 @@ void vektor_appstate_canvas_drag_begin(GtkGestureDrag* gesture, gdouble x,
position = m33_transform(m33_inverse(state->renderInfo->canvasMat),
(V2){position.x, position.y});
if(state->selectedShape != NULL) {
if (state->selectedShape != NULL) {
VektorShapeNode* selectedShape = state->selectedShape;
// get selected shape's handles and check
// if we click any of them
for(size_t i = 0; i < selectedShape->base.handleCount; i++) {
VektorBBox bbox = vektor_shape_get_handle_bbox(selectedShape->base.handles[i]);
if(vektor_bbox_isinside(bbox, position)) {
for (size_t i = 0; i < selectedShape->base.handleCount; i++) {
VektorBBox bbox =
vektor_shape_get_handle_bbox(selectedShape->base.handles[i]);
if (vektor_bbox_isinside(bbox, position)) {
// clicked inside handle
state->heldHandleIndex = i;
vektor_canvas_geometry_changed(state->renderInfo);
@@ -285,9 +302,10 @@ void vektor_appstate_canvas_drag_update(GtkGestureDrag* gesture, gdouble x,
(V2){position.x, position.y});
// drag handle if selected
if(state->selectedShape != NULL && state->heldHandleIndex != -1) {
if (state->selectedShape != NULL && state->heldHandleIndex != -1) {
state->selectedShape->base.handles[state->heldHandleIndex] = position;
vektor_shape_handles_updated(&state->selectedShape->base, &state->heldHandleIndex);
vektor_shape_handles_updated(&state->selectedShape->base,
&state->heldHandleIndex);
vektor_canvas_geometry_changed(state->renderInfo);
}
}

10
src/core/modifier.c
View File

@@ -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 =

13
src/core/modifier.h
View File

@@ -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

21
src/core/raster.c
View File

@@ -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;
@@ -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);

6
src/ui/vektorcanvas.c
View File

@@ -160,9 +160,9 @@ void vektor_canvas_geometry_changed(VektorCanvasRenderInfo* renderInfo) {
shape_vertex_count = vb.count;
// create selection quad if a shape is selected
VektorBBox bbox = vektor_primitive_get_bbox(selectedShape->base.primitive);
VektorBBox bbox =
vektor_primitive_get_bbox(selectedShape->base.primitive);
// expand it a little so it is not inset
bbox = vektor_bbox_expand(bbox, 0.03f);
@@ -196,7 +196,7 @@ static gboolean render(GtkGLArea* a, GdkGLContext* ctx,
// PASS 2 - draw selection quads
if (vb.count > shape_vertex_count) {
//g_print("vdelta: %zu\n", vb.count - shape_vertex_count);
// g_print("vdelta: %zu\n", vb.count - shape_vertex_count);
float time =
(g_get_monotonic_time() - renderInfo->startupTime) / 10000000.0f;