added old 3ds stuff

public/blog/old3ds_touchscreen.md

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+---
+title: 3DS Programming - Touchscreen Input
+description: A guide to using the touchscreen on the 3DS. (Old)
+date: 2025-01-01
+tags: ['3ds', 'programming', 'c', 'devkitpro', 'old']
+previous: old3ds_romfs.md
+---
+
+# Touchscreen Input
+
+> [!warning]
+> This guide of mine is old - Like 3 years old at the time of posting. I prefer to keep it up, but I don't think it very highly - It should still work though.
+> I might make a new one in the future.
+> I'm doing some alterations at least to make it more readable.
+> It doesn't teach why things are done very well is my primary issue with it.
+
+Here we will find the position of a touch on the touchscreen.
+
+It is very simple to do this.
+
+## Getting the touch position
+
+To find the touch position, we need to request the touchPosition type from the OS, and read from that.
+
+We must first create a touchPosition like so:
+
+```c
+// Check for input
+// ...
+
+// Will contain the position of the touch
+touchPosition touch;
+
+// Will obtain that information
+hidTouchRead(&touch);
+
+// Exit program if START is pressed
+// ...
+```
+
+Then, we must read from it like so:
+
+The touch position is stored in our touchPosition as 'px' and 'py'.
+
+## Printing the information to the screen
+
+To print the position so we may see it, we should, instead of spamming the console with it, overwrite the X and Y position output by setting the position of the output first.
+
+This would make it much easier to read, although we would need some whitespace after it to prevent anything getting printed without overwriting:
+
+```c
+// Print the touch screen coordinates
+// Keep the whitespace if you do not want issues
+printf("\x1b[1;0H X=%u Y=%u   ", touch.px, touch.py);
+
+// Exit program if START is pressed
+// ...
+```
+
+The position should default to [0, 0] when no touch is found:
+
+![Failed to load image](/files/old3ds/touchscreen/dkp_touch0.png)
+
+## Wrapping up
+
+Our code should now look like this:
+```c
+#include <stdio.h>
+#include <3ds.h>
+
+int main() {
+    // Initialize the console
+    gfxInitDefault();
+    consoleInit(GFX_BOTTOM, NULL);
+
+    // Will contain the position of the touch
+    // This can either be inside or outside the main loop
+    touchPosition touch;
+
+    while (aptMainLoop()) {
+        // Check for input
+        hidScanInput();
+
+        // Will obtain that information
+        hidTouchRead(&touch);
+
+        // Print the touch screen coordinates
+        // Keep the whitespace if you do not want issues
+        printf("\x1b[1;0H X=%u Y=%u   ", touch.px, touch.py);
+
+        // Exit program if START is pressed
+        if (hidKeysDown() & KEY_START)
+            break;
+    }
+
+    return 0;
+}
+```