Add basic movement

game/systems/systems.h

@@ -8,4 +8,38 @@
 void renderEntities(ecs_iter_t *it);
 void updateAnimations(ecs_iter_t *it);
 
+#include "../game_state.h"
+#include <math.h>
+#include <raymath.h>
+static void updatePos(ecs_iter_t *it) {
+    Position *pos = ecs_field(it, Position, 1);
+    TextureRegion *t = ecs_field(it, TextureRegion, 2);
+
+    Vector2 target = GAME->targetPos;
+    if (target.x == 0 && target.y == 0) return;
+
+    for (i32 i = 0; i < it->count; i++) {
+        target = Vector2Subtract(target, pos[i]);
+        float dX = 0, dY = 0;
+        if (target.x > 0) dX = 1;
+        else if (target.x < 0) dX = -1;
+        if (target.y > 0) dY = 1;
+        else if (target.y < 0) dY = -1;
+
+        dX *= 20;
+        dY *= 20;
+
+        if (Vector2Length(target) < 1) continue;
+
+        pos[i].x += dX * it->delta_time;
+        pos[i].y += dY * it->delta_time;
+
+        f32 ddx = GAME->targetPos.x - pos[i].x;
+        if (ddx < 0) ddx *= -1.0f;
+
+        if (ddx > 5)
+            t[i].flipX = dX < 0;
+    }
+}
+
 #endif //PIXELDEFENSE_SYSTEMS_H