This mouse is supported by [[The OCP Art Studio]], [[The Advanced OCP Art Studio]] and [[Carrier Command]].
It is emulated in [[Arnold (Emulator)|Arnold]], [[ACE_(Emulator)|ACE]] and [[ACE-DL]].
== Pictures ==
Here is the algorithm in pseudo-code:
// # initMouse initializes variables and centers the mouse pointer on screen function def initMouse() {: maxX = 639; maxY = 399; // # centering the mouse pointer on the screen virtualX = maxX >> 1; // virtualX = # maxX/2 virtualY = maxY >> 1; // virtualY = # maxY/2 // # store raw mouse values oldX = inp(&FBEE); oldY = inp(&FBEF); // # get mouse pointer position refreshMouse(); }def refreshMouse(): # get raw mouse values rawX = inp(&FBEE) rawY = inp(&FBEF) # get the relative mouse displacement since last call deltaX = rawX - oldX deltaY = rawY - oldY # store raw mouse values oldX = rawX oldY = rawY # calculate new unclipped virtual position virtualX = virtualX + deltaX virtualY = virtualY - deltaY # Kempston mouse Y-axis is inverted compared to screen coordinates! # perform clipping if virtualX < 0: virtualX = 0 elif virtualX > maxX: virtualX = maxX if virtualY < 0: virtualY = 0 elif virtualY > maxY: virtualY = maxY # now we translate position from the virtual screen to the current CPC screen mode mouseX = virtualX if graphicsMode == 2 else (virtualX >> 1 if graphicsMode == 1 else virtualX >> 2) mouseY = virtualY >> 1 == Manual == * Any manual exists? == Downloads == * Any kempston example or driver software exists?
// refreshMouse has to be called before you redraw the mouse pointer (and ideally on every frame)
function refreshMouse() {
// get raw mouse values
rawX = inp(&FBEE);
rawY = inp(&FBEF);
// get the relative mouse displacement since last call
deltaX = rawX - oldX;
deltaY = rawY - oldY;
// store raw mouse values
oldX = rawX;
oldY = rawY;
// calculate new unclipped virtual position
virtualX = virtualX + deltaX;
virtualY = virtualY - deltaY; // Kempston mouse Y-axis is inverted compared to screen coordinates!
// perform clipping
if (virtualX < 0) then virtualX = 0;
else if (virtualX > maxX) then virtualX = maxX;
if (virtualY < 0) then virtualY = 0;
else if (virtualY > maxY) then virtualY = maxY;
// now we translate position from the virtual screen to the current CPC screen mode
mouseY = virtualY >> 1; // mouseY = virtualY/2
if (mode2) then mouseX = virtualX;
else if (mode1) then mouseX = virtualX >> 1; // mouseX = virtualX/2
else if (mode0) then mouseX = virtualX >> 2; // mouseX = virtualX/4
}
[[Category:Peripherals]][[Category:Input Device]]