From e8f7ca58aa7b0554def69ee0a1700e6cb3af1809 Mon Sep 17 00:00:00 2001
From: Juan Manuel Tomas <jtomas1815@gmail.com>
Date: Tue, 25 Jan 2022 20:00:31 -0300
Subject: Add basic projectile

---
 main.c | 39 +++++++++++++++++++++++++++++++++++++--
 1 file changed, 37 insertions(+), 2 deletions(-)

diff --git a/main.c b/main.c
index d08090f..8a4fd34 100644
--- a/main.c
+++ b/main.c
@@ -75,6 +75,13 @@ void GameMain(SDL_Renderer *context) {
 	float player_vy = 0;
 	float player_ay = -9.8;
 
+	float projectile_x = 100;
+	float projectile_y = 500;
+	float projectile_vy = 100;
+	float projectile_vx = 5;
+	float projectile_ay = -9.8;
+	int projectile_alive = 0;
+
 	float old_t = 0.0;
 
 	int exit = 0;
@@ -87,15 +94,19 @@ void GameMain(SDL_Renderer *context) {
 		while (SDL_PollEvent(&event)) {
 			if (event.type == SDL_QUIT) {
 				exit = 1;
+			} else if (event.type == SDL_KEYDOWN && event.key.state == SDL_PRESSED && event.key.keysym.sym == SDLK_SPACE && !projectile_alive) {
+				projectile_alive = 1;
+				projectile_x = player_x;
+				projectile_y = player_y + 10;
 			}
 		}
 		int mouse_x, mouse_y;
 		Uint32 mouse_state = SDL_GetMouseState(&mouse_x, &mouse_y);
 		float size = 20;
 		if (mouse_state & SDL_BUTTON_LMASK) {
-			PaintMask(mask, WINDOW_W, WINDOW_H, mouse_x, WINDOW_H - mouse_y, 1.0, size);
+			PaintMask(mask, WINDOW_W, WINDOW_H, mouse_x, mouse_y, 1.0, size);
 		} else if (mouse_state & SDL_BUTTON_RMASK) {
-			PaintMask(mask, WINDOW_W, WINDOW_H, mouse_x, WINDOW_H - mouse_y, 0.0, size);
+			PaintMask(mask, WINDOW_W, WINDOW_H, mouse_x, mouse_y, 0.0, size);
 		}
 
 		const Uint8 *keys = SDL_GetKeyboardState(0);
@@ -125,6 +136,20 @@ void GameMain(SDL_Renderer *context) {
 			}
 		}
 
+		if (projectile_alive) {
+			if (projectile_y >= 0 && projectile_y < WINDOW_H &&
+					projectile_x >= 0 && projectile_x < WINDOW_W &&
+					mask[(int)projectile_x + (int)projectile_y * WINDOW_W] == 0.0) {
+				projectile_x += projectile_vx * dt;
+				projectile_y += projectile_vy * dt;
+				projectile_vy += projectile_ay * dt;
+			} else {
+				projectile_alive = 0;
+				projectile_vy = 100;
+				PaintMask(mask, WINDOW_W, WINDOW_H, projectile_x, projectile_y, 0.0, 40);
+			}
+		}
+
 		void *pixels;
 		int pitch;
 		SDL_LockTexture(mask_texture, 0, &pixels, &pitch);
@@ -138,7 +163,9 @@ void GameMain(SDL_Renderer *context) {
 
 		SDL_SetRenderDrawColor(context, 40, 40, 40, 255);
 		SDL_RenderClear(context);
+
 		SDL_RenderCopy(context, background, 0, 0);
+
 		SDL_SetRenderTarget(context, terrain);
 		SDL_SetRenderDrawColor(context, 0, 0, 0, 0);
 		SDL_RenderClear(context);
@@ -146,9 +173,17 @@ void GameMain(SDL_Renderer *context) {
 		SDL_RenderCopy(context, foreground, 0, 0);
 		SDL_SetRenderTarget(context, 0);
 		SDL_RenderCopy(context, terrain, 0, 0);
+
 		SDL_SetRenderDrawColor(context, 255, 0, 0, 255);
 		SDL_Rect player_rect = {player_x - 5, WINDOW_H - player_y - 10, 10, 10 };
 		SDL_RenderFillRect(context, &player_rect);
+
+		if (projectile_alive) {
+			SDL_SetRenderDrawColor(context, 0, 255, 0, 255);
+			SDL_Rect projectile_rect = {projectile_x - 5, WINDOW_H - projectile_y - 10, 10, 10 };
+			SDL_RenderFillRect(context, &projectile_rect);
+		}
+
 		SDL_RenderPresent(context);
 		SDL_Delay(1);
 	}
-- 
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