src

1 files changed, 208 insertions, 0 deletions

diff --git a/src/bullets.c b/src/bullets.c
new file mode 100644
index 0000000..c2f6d3b
--- /dev/null
+++ b/src/bullets.c
@@ -0,0 +1,208 @@
+#include "../include/bullets.h"
+
+void shoot(platform_window* window, player p) {
+	map_info info = get_map_info(window);
+	float bullet_range = 100.0f;
+
+	float hh = get_height_of_tile_under_coords(window, p.playerx, p.playery);
+
+	float dirx = (_global_mouse.x - (window->width/2));
+	float diry = (_global_mouse.y - (window->height/2));
+	double length = sqrt(dirx * dirx + diry * diry);
+	dirx /= length;
+	diry /= length;
+
+	#define SPRAY_BOUNDS (0.1f)
+	dirx += ((float)rand()/(float)(RAND_MAX/SPRAY_BOUNDS)-(SPRAY_BOUNDS/2));
+	diry += ((float)rand()/(float)(RAND_MAX/SPRAY_BOUNDS)-(SPRAY_BOUNDS/2));
+
+	float bulletx = p.gunx;
+	float bullety = p.guny;
+	float bullet_end_point_x = bulletx+dirx*bullet_range;
+	float bullet_end_point_y = bullety+diry*bullet_range;
+
+	for (int i = 0; i < max_bullets; i++) {
+		bullet b = bullets[i];
+		if (b.active) continue;
+
+		bullets[i] = (bullet){p.id, true, bulletx, bullety, hh + 0.5, bullet_end_point_x, bullet_end_point_y};
+		break;
+	}
+}
+
+bool check_if_bullet_collided_with_section(float* dist_of_closest_intersect, vec2f bstart, vec2f bend, vec2f l1, vec2f l2, vec2f* intersect_point_buf) {
+	if (lines_intersect(bstart, bend, l1, l2)) {
+		vec2f intersect_point = get_intersection_point(bstart, bend, l1, l2);
+
+		float dirx = (bstart.x - intersect_point.x);
+		float diry = (bstart.y - intersect_point.y);
+		double length_of_shot = sqrt(dirx * dirx + diry * diry);
+
+		if (length_of_shot > *dist_of_closest_intersect) {
+			return false;
+		}
+		*dist_of_closest_intersect = length_of_shot;
+		*intersect_point_buf = intersect_point;
+		return true;
+	}
+	return false;
+}
+
+bool check_if_bullet_collided_with_object(bullet* b, platform_window* window) {
+	map_info info = get_map_info(window);
+	float size = get_bullet_size_in_tile(window);
+	
+	vec2f bstart = (vec2f){b->position.x, b->position.y};
+	vec2f bend = (vec2f){b->endx, b->endy};
+
+	bool result = false;
+	float dist_of_closest_intersect = __FLT_MAX__;
+
+	for (int i = 0; i < max_objects; i++) {
+		object o = objects[i];
+		if (!o.active) continue;
+		if (b->position.z <= o.h + o.size.z && b->position.z >= o.h) {
+			box obj_box = get_box_of_square(window, (vec3f){o.position.x, o.position.y, o.h}, o.size);
+			vec2f intersect_point;
+			if (check_if_bullet_collided_with_section(&dist_of_closest_intersect, bstart, bend, obj_box.bl_b, obj_box.br_b, &intersect_point)) {
+				result = true;
+			}
+			if (check_if_bullet_collided_with_section(&dist_of_closest_intersect, bstart, bend, obj_box.tl_b, obj_box.tr_b, &intersect_point)) {
+				result = true;
+			}
+			if (check_if_bullet_collided_with_section(&dist_of_closest_intersect, bstart, bend, obj_box.tl_b, obj_box.bl_b, &intersect_point)) {
+				result = true;
+			}
+			if (check_if_bullet_collided_with_section(&dist_of_closest_intersect, bstart, bend, obj_box.tr_b, obj_box.br_b, &intersect_point)) {
+				result = true;
+			}
+
+			if (result) {
+				b->endy = intersect_point.y;
+				b->endx = intersect_point.x;
+			}
+		}
+	}
+
+	return result;
+}
+
+bool check_if_bullet_collided_with_zombie(bullet b, platform_window* window, bool kill_if_collided) {
+	map_info info = get_map_info(window);
+	float size = get_bullet_size_in_tile(window);
+
+	bool result = false;
+	float dist_of_closest_intersect = __FLT_MAX__;
+	int index_of_closest_zombie = -1;
+	
+	for (int i = 0; i < max_zombies; i++) {
+		zombie o = zombies[i];
+		if (!o.alive) continue;
+
+		vec2f bstart = (vec2f){b.position.x, b.position.y};
+		vec2f bend = (vec2f){b.endx, b.endy};
+
+		if (b.position.z <= o.position.z + o.size.z && b.position.z >= o.position.z) {
+			vec2f intersect_point;
+			box obj_box = get_box_of_square(window, (vec3f){o.position.x, o.position.y, o.position.z}, o.size);
+			bool this_zombie_collided = false;
+			if (check_if_bullet_collided_with_section(&dist_of_closest_intersect, bstart, bend, obj_box.bl_b, obj_box.br_b, &intersect_point)) {
+				this_zombie_collided = true;
+				index_of_closest_zombie = i;
+			}
+			if (check_if_bullet_collided_with_section(&dist_of_closest_intersect, bstart, bend, obj_box.tl_b, obj_box.tr_b, &intersect_point)) {
+				this_zombie_collided = true;
+				index_of_closest_zombie = i;
+			}
+			if (check_if_bullet_collided_with_section(&dist_of_closest_intersect, bstart, bend, obj_box.tl_b, obj_box.bl_b, &intersect_point)) {
+				this_zombie_collided = true;
+				index_of_closest_zombie = i;
+			}
+			if (check_if_bullet_collided_with_section(&dist_of_closest_intersect, bstart, bend, obj_box.tr_b, obj_box.br_b, &intersect_point)) {
+				this_zombie_collided = true;
+				index_of_closest_zombie = i;
+			}
+
+			if (this_zombie_collided) {
+				result = true;
+			}
+		}
+	}
+
+	if (kill_if_collided && result) {
+		zombies[index_of_closest_zombie].alive = false;
+		return result;
+	}
+
+	return result;
+}
+
+static bool check_if_bullet_collided_with_ground(bullet *b, platform_window* window) {
+	map_info info = get_map_info(window);
+	float dirx = (b->endx - b->position.x);
+	float diry = (b->endy - b->position.y);
+	float length = sqrt(dirx * dirx + diry * diry);
+	dirx /= length;
+	diry /= length;
+	double nr_tiles_to_check = length*4; // check 4 points per tile.
+
+	for (int i = 1; i < nr_tiles_to_check; i++) {
+		float xtocheck = b->position.x + (dirx*i/4);
+		float ytocheck = b->position.y + (diry*i/4);
+		if (!is_in_bounds(xtocheck, ytocheck)) break;
+		tile tile = get_tile_under_coords(window, xtocheck, ytocheck);
+
+		float h = get_height_of_tile_under_coords(window, xtocheck, ytocheck);
+		if (b->position.z <= h) {
+			b->endx = xtocheck;
+			b->endy = ytocheck;
+			return true;
+		}
+	}
+	return false;
+} 
+
+void draw_bullets(platform_window* window) {
+	float size = get_bullet_size(window);
+	map_info info = get_map_info(window);
+
+	for (int i = 0; i < max_bullets; i++) {
+		bullet b = bullets[i];
+		if (!b.active) continue;
+		player p = get_player_by_id(b.player_id);
+		bullets[i].position.x = p.gunx;
+		bullets[i].position.y = p.guny;
+		bullets[i].position.z = p.gun_height;
+		
+		if (check_if_bullet_collided_with_ground(&b, window)) {
+			bullets[i].endy = b.endy;
+			bullets[i].endx = b.endx;
+			b = bullets[i];
+		}
+
+		if (check_if_bullet_collided_with_object(&b, window)) {
+			bullets[i].endy = b.endy;
+			bullets[i].endx = b.endx;
+			b = bullets[i];
+		}
+		
+		if (check_if_bullet_collided_with_zombie(b, window, true)) {
+			bullets[i].active = false;
+		}
+
+		bullets[i].alive_time += update_delta;
+		bullets[i].active = false;
+
+		if (!b.active) continue;
+
+		BULLET_RENDER_DEPTH(b.position.z);
+
+		float bullet_render_x = b.position.x*info.tile_width + (b.position.y*info.px_incline);
+		float bullet_render_y = b.position.y*info.tile_height - (b.position.z*info.px_raised_per_h);
+
+		float bullet_render_x_end = b.endx*info.tile_width + (b.endy*info.px_incline);
+		float bullet_render_y_end = b.endy*info.tile_height - (b.position.z*info.px_raised_per_h);
+
+		renderer->render_line(bullet_render_x, bullet_render_y, bullet_render_x_end, bullet_render_y_end, 2, rgb(0,255,100));
+	}
+}
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