MacBookでマウスカーソルがループするアプリを製作（ソース）

１ファイルです（苦笑）。Apple社が、がんばってくれています（苦笑）

/*
 *  LoopCursor_mini.c
 *
 *  Created by NF on 2006/12/16.
 */
 
#include 

/* handler for MouseMoved event.   for MacOS X 10.2 and later */
static OSStatus MouseMovedHandler( EventHandlerCallRef inCaller, EventRef inEvent, void* inRefcon )
{
    HIPoint        ScreenMax; // MainScreen's bottom-right Position
    HIPoint        MouseLocation, MouseDelta;
    
    // get ScreenMax
    CGRect    mainscreen = CGDisplayBounds(CGMainDisplayID());
    ScreenMax           = CGPointMake(mainscreen.size.width -1, mainscreen.size.height -1);
    
    // get MouseLocation
    GetEventParameter(inEvent, kEventParamMouseLocation,
                                   typeHIPoint, NULL, sizeof(HIPoint), NULL, &MouseLocation);

    // Nothing is done.
    if( (MouseLocation.x == 0                  && MouseLocation.y == 0              ) ||
        (MouseLocation.x == 0                  && MouseLocation.y == ScreenMax.y ) ||
        (MouseLocation.x == ScreenMax.x && MouseLocation.y == 0              ) ||
        (MouseLocation.x == ScreenMax.x && MouseLocation.y == ScreenMax.y ) ||
        (MouseLocation.x > 0 && MouseLocation.x < ScreenMax.x) )
    {
        return noErr;
    }
    
    // get MouseDelta
    GetEventParameter(inEvent, kEventParamMouseDelta,
                                    typeHIPoint, NULL, sizeof(HIPoint), NULL, &MouseDelta);
    
    // Set MouseLocation.x
    if ( MouseLocation.x == 0){    // left edge
        MouseLocation.x = ScreenMax.x + MouseDelta.x;
    }else if(MouseLocation.x == ScreenMax.x ){ // right edge
        MouseLocation.x = MouseDelta.x;
    }
    // Set MouseLocation.y
    if ( atan2(fabs(MouseDelta.y),fabs(MouseDelta.x)) > 0.388 ){ // IncidenceAngle is larger than 70 degrees
        MouseLocation.y = ScreenMax.y - MouseLocation.y;
    }
    
    // move MouseCursor Position
    CGWarpMouseCursorPosition(MouseLocation);

    return noErr;
}

/* main function.   for MacOS X 10.3 and later */
int main (int argc, const char * argv)
{
    // install Handler for kEventMouseMoved event
    EventTypeSpec kEvent={
        {kEventClassMouse, kEventMouseMoved},
        {kEventClassMouse, kEventMouseMoved}    
    };                                          
    InstallEventHandler(GetEventMonitorTarget(), MouseMovedHandler, GetEventTypeCount(kEvent), kEvent, 0, NULL);

    // run EventLoop
    RunApplicationEventLoop();
    
    return 0;
}