HAM Tutorial :: Day 3 :: Input

Another easy thing to do with HAM is user input. Today we'll start with the code from the Day 2 tutorial and add some code to check for input.

// The Main HAM Library
#include <mygba.h>

// Function: main()
int main()
{
    // Variables
    bool key_pressed = 0;

    // Initialize HAMlib
    ham_Init();

    // Initialize the text display system in BGMODE 0
    ham_InitText(0);

    // Draw some text to the screen
    ham_DrawText(0,0,"Hello, World!");
    ham_DrawText(10,19,"Press D-Pad To Reset");

    // Loop until a direction on the D-Pad is pressed
    while(key_pressed == 0)
    {
        // Check for input
        if (F_CTRLINPUT_UP_PRESSED
            || F_CTRLINPUT_DOWN_PRESSED
            || F_CTRLINPUT_LEFT_PRESSED
            || F_CTRLINPUT_RIGHT_PRESSED)
        {
            // Change key_pressed to true
            key_pressed = 1;
        }
    }

    return 0;
} // End of main()

Code Explanation

if (F_CTRLINPUT_UP_PRESSED ...)
During the while loop it will do a check to see if up, down, left or right is pressed. After changing key_pressed to false, it will end the while() loop and 'reset' the game.

NOTE: In order to do diagonal movement, you can use something like:
if (F_CTRLINPUT_UP_PRESSED && F_CTRLINPUT_LEFT_PRESSED)
There will be an example of this in a later project.

Well, another day, another tutorial. Again, nothing difficult here.

Download Code

NOTE: You may need to Right-click and choose Save As.

HAM Version 2.80 And Higher
Download All Files In One Zip: Day3_Input.zip

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