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POWhy is CGWarpMouseCursorPosition causing a delay? If it is not, what is?
 

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  1. POWhy is CGWarpMouseCursorPosition causing a delay? If it is not, what is?
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    <p>I have code here that restricts the mouse to a region on the screen, it is working relatively well, with only one big problem. The mouse doesn't get moved cleanly/smoothly when running along the edges of the area, it instead jumps in a very choppy manner, I believe this might be due to CGWarpMouseCursorPosition causing a delay upon each "warp".</p> <p><strong>Can anyone tell if it's something in my code that is causing this delay, or if it is in fact the mouse warp function. If it is the mouse warp function, is there any way I can get a smooth relocation of the mouse?</strong> I've done the same thing in flash and it works flawlessly, I know that the loop isn't just taking so much time to execute that it's slowing things down because it only runs maybe 4 or 5 times. </p> <pre><code>CGEventRef mouse_filter(CGEventTapProxy proxy, CGEventType type, CGEventRef event, void *refcon) { CGPoint point = CGEventGetLocation(event); float tX = point.x; float tY = point.y; if( tX &lt;= 700 &amp;&amp; tX &gt;= 500 &amp;&amp; tY &lt;= 800 &amp;&amp; tY &gt;= 200){ // target is inside O.K. area, do nothing }else{ CGPoint target; //point inside restricted region: float iX = 600; // inside x float iY = 500; // inside y // delta to midpoint between iX,iY and tX,tY float dX; float dY; float accuracy = .5; //accuracy to loop until reached do { dX = (tX-iX)/2; dY = (tY-iY)/2; if((tX-dX) &lt;= 700 &amp;&amp; (tX-dX) &gt;= 500 &amp;&amp; (tY-dY) &lt;= 800 &amp;&amp; (tY-dY) &gt;= 200){ iX += dX; iY += dY; } else { tX -= dX; tY -= dY; } } while (abs(dX)&gt;accuracy || abs(dY)&gt;accuracy); target = CGPointMake(roundf(tX), roundf(tY)); CGWarpMouseCursorPosition(target); } return event; } int main(int argc, char *argv[]) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; CFRunLoopSourceRef runLoopSource; CGEventMask event_mask; event_mask = CGEventMaskBit(kCGEventMouseMoved) | CGEventMaskBit(kCGEventLeftMouseDragged) | CGEventMaskBit(kCGEventRightMouseDragged) | CGEventMaskBit(kCGEventOtherMouseDragged); CFMachPortRef eventTap = CGEventTapCreate(kCGHIDEventTap, kCGHeadInsertEventTap, 0, event_mask, mouse_filter, NULL); if (!eventTap) { NSLog(@"Couldn't create event tap!"); exit(1); } runLoopSource = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, eventTap, 0); CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource, kCFRunLoopCommonModes); CGEventTapEnable(eventTap, true); CFRunLoopRun(); CFRelease(eventTap); CFRelease(runLoopSource); [pool release]; exit(0); } </code></pre>
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    1. COI don't think it's slow; timing it, the longest I got it to take was 0.006 seconds. It could be better in a couple of ways, though: You should define the delimited region in an NS- or CGRect, and I do think you can cut out the loop.
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      1. POWhy is CGWarpMouseCursorPosition causing a delay? If it is not, what is?
      1. USPeter Hosey
    2. COThe rectangle is just a temporary demo tool. I am actually going to be testing this against a black and white bitmap, where black pixels zones are mouse-friendly, and white zones the mouse cannot move into. The shape of the black area will be pretty bizarre, and thus I think the loop may be necessary. Unless you have a better solution?
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      1. POWhy is CGWarpMouseCursorPosition causing a delay? If it is not, what is?
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    3. COThat might actually make it easier to find whether the mouse has gone outside the acceptable area. The trick would be finding the nearest acceptable point to move it back to, but yeah, I think you will need a loop for that. Anyway, I'm surprised simply modifying the location and delta of the event (or even modifying and returning a copy) doesn't work.
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      1. POWhy is CGWarpMouseCursorPosition causing a delay? If it is not, what is?
      1. USPeter Hosey
 

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