From 79efc8a8e9976bbdd41d4a47b58c71d3be9d4ff7 Mon Sep 17 00:00:00 2001
From: Aldrik Ramaekers <aldrik@amftech.nl>
Date: Mon, 19 Dec 2022 16:42:15 +0100
Subject: zombie chunks

---
 src/zombie_chunk.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 src/zombie_chunk.c

(limited to 'src/zombie_chunk.c')

diff --git a/src/zombie_chunk.c b/src/zombie_chunk.c
new file mode 100644
index 0000000..f248474
--- /dev/null
+++ b/src/zombie_chunk.c
@@ -0,0 +1,85 @@
+#include "../include/zombie_chunk.h"
+#include "../include/math_helper.h"
+
+static vec2f get_random_point_around_point(vec3f center, float distance) {
+	float angleInDegrees = (rand() % 360);
+	vec2f origin = (vec2f){center.x, center.y}; 
+	float x = (float)(distance * cos(angleInDegrees * M_PI / 180.0f)) + center.x;
+	float y = (float)(distance * sin(angleInDegrees * M_PI / 180.0f)) + center.y;
+	
+	return (vec2f){x, y};
+}
+
+static image* get_chunk_image() {
+	#define AVAILABLE_ZOMBIE_CHUNK_COUNT 2
+	image* available_zombie_chunks[AVAILABLE_ZOMBIE_CHUNK_COUNT] = {
+		img_zombie_chunk_hand,
+		img_zombie_chunk_foot,
+	};
+	return available_zombie_chunks[rand() % AVAILABLE_ZOMBIE_CHUNK_COUNT];
+}
+
+void spawn_zombie_chunk(vec3f center) {
+	for (int i = 0; i < MAX_ZOMBIE_CHUNKS; i++)
+	{
+		if (zombie_chunks[i].active) continue;
+
+		vec2f target = get_random_point_around_point(center, (float)rand()/(float)(RAND_MAX));
+		vec2f dir = get_dir_of_line((vec2f){center.x, center.y}, (vec2f){target.x, target.y});
+		float height = get_height_of_tile_under_coords(target.x, target.y);
+		
+		zombie_chunk chunk = {.active = true, .start_position = center, .direction = dir, 
+			.position = center, .duration = 0.0f, .target_position = (vec3f){target.x, target.y, height},
+			.img = get_chunk_image(), .rotation = (float)rand()/(float)(RAND_MAX)};
+		zombie_chunks[i] = chunk;
+		return;
+	}
+}
+
+void update_zombie_chunks() {
+	for (int i = 0; i < MAX_ZOMBIE_CHUNKS; i++)
+	{
+		if (!zombie_chunks[i].active) continue;
+
+		zombie_chunks[i].duration += update_delta;
+		if (zombie_chunks[i].duration >= CHUNK_MAX_DURATION) {
+			zombie_chunks[i].active = false;
+			continue;
+		}
+		if (zombie_chunks[i].duration >= CHUNK_DURATION_OF_DROP) {
+			continue;
+		}
+
+		zombie_chunks[i].rotation += zombie_chunks[i].direction.x < 0.0f ? update_delta : -update_delta;
+
+		float x = zombie_chunks[i].start_position.x + ((zombie_chunks[i].start_position.x - zombie_chunks[i].target_position.x) / CHUNK_DURATION_OF_DROP) * zombie_chunks[i].duration;
+		float y = zombie_chunks[i].start_position.y + ((zombie_chunks[i].start_position.y - zombie_chunks[i].target_position.y) / CHUNK_DURATION_OF_DROP) * zombie_chunks[i].duration;
+		float z = zombie_chunks[i].start_position.z + ((zombie_chunks[i].start_position.z - zombie_chunks[i].target_position.z) / CHUNK_DURATION_OF_DROP) * zombie_chunks[i].duration;
+
+		zombie_chunks[i].position.x = x;
+		zombie_chunks[i].position.y = y;
+		zombie_chunks[i].position.z = z;
+	}
+}
+
+void draw_zombie_chunks(platform_window* window) {
+	for (int i = 0; i < MAX_ZOMBIE_CHUNKS; i++)
+	{
+		if (!zombie_chunks[i].active) continue;
+
+		DROP_RENDER_DEPTH((int)(zombie_chunks[i].position.y));
+		
+		int alpha = 255;
+		if (zombie_chunks[i].duration >= CHUNK_MAX_DURATION - CHUNK_FADE_TIME) {
+			alpha = 255 - ((zombie_chunks[i].duration - (CHUNK_MAX_DURATION - CHUNK_FADE_TIME)) / CHUNK_FADE_TIME)*255;
+		}
+		if (alpha < 0) alpha = 0;
+
+		box box = get_render_box_of_square(window, zombie_chunks[i].position, (vec3f){0.6f, 0.6f, 0.6f});
+		//render_box_with_outline(box, rgba(200, 50, 50, alpha));
+
+		renderer->render_set_rotation(zombie_chunks[i].rotation);
+		renderer->render_image_tint(zombie_chunks[i].img, box.tl_d.x, box.tl_d.y, box.tr_d.x - box.tl_d.x, box.br_d.y - box.tr_d.y, rgba(255,255,255,alpha));
+		renderer->render_set_rotation(0.0f);
+	}
+}
\ No newline at end of file
-- 
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