Add line_from_origin function

include/math_utils.h

@@ -4,8 +4,11 @@
 #include "aliases/aliases.h"
 
 #define square(x) (x * x)
+#define absolute(x) (x < 0.0 ? x * -1.0 : x)
 
 i32 min(i32 a, i32 b);
 i32 max(i32 a, i32 b);
+f64 radians(f64 degrees);
+f64 degrees(f64 radians);
 
 #endif // !MATH_UTILS_H

src/compositor.c

@@ -76,11 +76,6 @@ i32 run_main_loop(void) {
 
   i32 toolbox_button_x = (toolbox->width - BUTTON_WIDTH) / 2;
 
-  line ln = (line){
-      (point){80, 100},
-      (point){120, 300},
-  };
-
   while (comp.running) {
     while (SDL_PollEvent(&(comp.event))) {
       handle_ui_events(&(comp.windows[comp.active_window - 1]), &(comp.ctx),
@@ -157,8 +152,6 @@ i32 run_main_loop(void) {
                                   comp.nodes[i].colours);
     }
 
-    ln = ui_noodle(main_window, &(comp.ctx), ln, op_node_colours);
-
     for (u64 i = 0; i < MAX_WINDOWS; ++i) {
       swap_buffers(&(comp.windows[i]));
     }

src/math_utils.c

@@ -1,5 +1,10 @@
 #include "math_utils.h"
+#include <math.h>
 
 i32 min(i32 a, i32 b) { return a <= b ? a : b; }
 
 i32 max(i32 a, i32 b) { return a >= b ? a : b; }
+
+f64 radians(f64 degrees) { return degrees * M_PI / 180.0; }
+
+f64 degrees(f64 radians) { return radians * 180.0 / M_PI; }

src/ui.c

@@ -8,8 +8,10 @@
 #include <stdlib.h>
 
 #define NOODLE_HALF_WIDTH 2
+#define DEFAULT_NOODLE_LENGTH 60
 
 INTERNAL bool aabb(rect rec, i32 x, i32 y);
+INTERNAL line line_from_origin(point origin, f64 angle, i32 line_length);
 
 void init_ui_ctx(ui_ctx *ctx) {
   *ctx = (ui_ctx){0};
@@ -239,3 +241,16 @@ INTERNAL bool aabb(rect rec, i32 x, i32 y) {
   return x > rec.topleft.x && x <= rec.topleft.x + rec.w && y > rec.topleft.y &&
          y <= rec.topleft.y + rec.h;
 }
+
+INTERNAL line line_from_origin(point origin, f64 angle, i32 line_length) {
+  f64 rad = radians(angle);
+  f64 direction = angle / absolute(angle) * -1;
+
+  i32 adjacent = line_length * cos(rad) * direction; // dx
+  i32 opposite = line_length * sin(rad) * direction; // dy
+
+  return (line){
+      (point){origin.x + adjacent, origin.y + opposite},
+      origin,
+  };
+}