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feat: add circles

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This commit is contained in:
Froxwin
2026-03-10 15:36:19 +00:00
parent 143a33558d
commit 22b6700768
6 changed files with 65 additions and 12 deletions
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37
src/core/raster.c
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@@ -3,8 +3,11 @@
#include "primitives.h"
#include "src/core/vector.h"
#include "stddef.h"
#include <math.h>
#include <stddef.h>
#define PI 3.14159265358979323846
void vektor_edgebuffer_add_edge(EdgeBuffer* buffer, Edge edge) {
if (buffer->count >= buffer->capacity) {
buffer->capacity = buffer->capacity ? buffer->capacity * 2 : 4;
@@ -14,7 +17,7 @@ void vektor_edgebuffer_add_edge(EdgeBuffer* buffer, Edge edge) {
}
void vektor_polyline_tessellate(EdgeBuffer* buffer, VektorPolyline* line,
size_t j) {
size_t j, double scale) {
for (size_t i = 0; i + 1 < line->count; i++) {
vektor_edgebuffer_add_edge(
buffer, (Edge){line->points[i], line->points[i + 1], 0, j});
@@ -22,7 +25,7 @@ void vektor_polyline_tessellate(EdgeBuffer* buffer, VektorPolyline* line,
}
void vektor_polygon_tessellate(EdgeBuffer* buffer, VektorPolygon* polygon,
size_t j) {
size_t j, double scale) {
for (size_t i = 0; i + 1 < polygon->count; i++) {
vektor_edgebuffer_add_edge(
buffer, (Edge){polygon->points[i], polygon->points[i + 1], 0, j});
@@ -32,8 +35,23 @@ void vektor_polygon_tessellate(EdgeBuffer* buffer, VektorPolygon* polygon,
(Edge){polygon->points[polygon->count - 1], polygon->points[0], 0, j});
}
void vektor_circle_tessellate(EdgeBuffer* buffer, VektorCircle* circle,
size_t j, double scale) {
double err = 0.000025;
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;
V2 p1 = (V2){circle->center.x + circle->radius * cos(theta1),
circle->center.y + circle->radius * sin(theta1)};
V2 p2 = (V2){circle->center.x + circle->radius * cos(theta2),
circle->center.y + circle->radius * sin(theta2)};
vektor_edgebuffer_add_edge(buffer, (Edge){p1, p2, 0, j});
}
}
void vektor_rectangle_tessellate(EdgeBuffer* buffer, VektorRectangle* rct,
size_t j) {
size_t j, double scale) {
if (vec2_equals(rct->end, rct->start)) {
return;
}
@@ -49,22 +67,27 @@ void vektor_rectangle_tessellate(EdgeBuffer* buffer, VektorRectangle* rct,
vektor_edgebuffer_add_edge(buffer, left);
}
void vektor_rasterize(VertexBuffer* vb, VektorShapeBuffer* shapes) {
void vektor_rasterize(VertexBuffer* vb, VektorShapeBuffer* shapes,
double scale) {
EdgeBuffer edges = {0};
for (size_t i = 0; i < shapes->count; i++) {
VektorPrimitive* p = &shapes->shapes[i].primitive;
switch (p->kind) {
case VEKTOR_POLYLINE:
vektor_polyline_tessellate(&edges, p->polyline, i);
vektor_polyline_tessellate(&edges, p->polyline, i, scale);
break;
case VEKTOR_POLYGON:
vektor_polygon_tessellate(&edges, p->polygon, i);
vektor_polygon_tessellate(&edges, p->polygon, i, scale);
break;
case VEKTOR_CIRCLE:
vektor_circle_tessellate(&edges, &p->circle, i, scale);
break;
case VEKTOR_RECTANGLE:
vektor_rectangle_tessellate(&edges, &p->rectangle, i);
vektor_rectangle_tessellate(&edges, &p->rectangle, i, scale);
break;
default: