Differences

This shows you the differences between two versions of the page.

--- notes:comporg:spring2024:projects:mpg0 [2024/02/05 14:38] – [Gamepad input] wgates1
+++ notes:comporg:spring2024:projects:mpg0 [2024/02/08 02:32] (current) – [Game loop] rspringe
@@ Line 7: / Line 7: @@
 ====Game loop====
+For this project, you will be making a Snake game.
+The game loop for Snake is simple: you will control a snake around the screen to eat pieces of food. Once a piece of food has been eaten, your score will increase, and the snake will get longer.
+The game ends when the head of the snake runs into either a wall, or another part of its body.
 ====Sprites====
@@ Line 14: / Line 18: @@
   * A link to GIMP download: https://www.gimp.org/downloads/
   * You could also have a death screen for when your snake dies.
+Another good option for designing your snake is downloading a photo off the internet(probably an animated/cartoon one). I personally got the following photo "https://pngtree.com/freepng/cartoon-snake_6160039.html" and cropped just the head. I then designed the body off of the colors from the head.
 ====Gamepad input====
 There is obviously your arrow key inputs but there are other buttons available as well. At least for gamepad(0) we have button_?_ = ? for the average keyboard:
@@ Line 23: / Line 29: @@
   * R = W
   * Start = Enter Key
+==Using controller==
+For those out there who want the whole experience of gaming, therein lies the ability to plug in a real video game controller, if your system allows (some laptops will at least). To that end, the controls are pretty straight-forward. Either console controller will rely upon the D-pad for movement, and the buttons should map to the controllers as well. For example, 'X' on a playstation controller should correspond to the "a_buttonpress" vircon command. The same should apply to 'A' on an Xbox controller.
+==Arrow Key Setup==
+If you are just trying to make the input based off of your arrow keys, you can simply copy the same setup:
+<code C>
+// Buttons to move up, down, left, and right
+bool mRight = (gamepad_right() == 1);
+bool mLeft = (gamepad_left() == 1);
+bool mUp = (gamepad_up() == 1);
+bool mDown = (gamepad_down() == 1);
+</code>
+NOTE: You'll want to do this in your game loop (the while loop) and make sure it is inside of main but outside of you game loop have the following:
+<code C>
+// Selects keyboard as gamepad to use for input
+select_gamepad(0);
+</code>
 When making you gamepad you'll make gamepad_direction values, WalkX and WalkY for example purposes.
@@ Line 33: / Line 58: @@
 <code bash>
 if( var == 1 ) {
-  Snake.X -= PlayerSpeed;
+  Snake[0].X -= PlayerSpeed;
 }
 </code>
@@ Line 49: / Line 74: @@
 <code C>
  // The direction is updated based on given input
-if (mRight)
+if (mRight && SHead.Direction != LEFT)
 {
     SHead.Direction = RIGHT;
 }
 </code>
+The "&& SHead.Direction != LEFT" prevents the snake from going back on its self.
 ====Bounds checking====
 The screen on vircon32 is 640 by 360, however, you do not have to type these out every time you make a game in vircon32 as they are stored in the screen_width and screen_height variables respectively. One way of bounds checking is to see where you are about to spawn the snake's head, if it is within the screen window then it is fine. However, if it is outside that window then game over.
 ====Handling motion====
+To handle motion you could do:
+<code c>
+int SnakeX;
+if( Right)
+{
+  SnakeX = SnakeX + 20;
+}
+</code>
 ====Score Display====

Lab46 Wiki

User Tools

Site Tools

Differences

Page Tools