Test zoom & click - https://stackoverflow.com/questions/62242343/mouse-event-with-cgeventcreatemouseevent-does-not-respect-coordinates-when-scree

AppDelegate.m

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (void)monitorMouseLocationNSEvent {
    void (^printMouseLocation)(NSString *, NSEvent *) = ^(NSString *type, NSEvent *event) {
        NSPoint location;
        if (event.window == nil) {
            location = event.locationInWindow;
        } else {
            location = [event.window convertPointToScreen:event.locationInWindow];
        }
        NSLog(@"%.1f x %.1f - NSEvent(%@)", location.x, location.y, type);
    };
    
    [NSEvent addGlobalMonitorForEventsMatchingMask:NSEventMaskMouseMoved
                                           handler:^(NSEvent * _Nonnull event) {
        printMouseLocation(@"Global", event);
    }];
    
    [NSEvent addLocalMonitorForEventsMatchingMask:NSEventMaskMouseMoved
                                          handler:^NSEvent * _Nullable(NSEvent * _Nonnull event) {
        printMouseLocation(@"Local", event);
        return event;
    }];
}

CGEventRef mouseEventTapSession(CGEventTapProxy proxy, CGEventType type, CGEventRef event, void *refcon) {
    CGPoint p = CGEventGetUnflippedLocation(event);
    NSLog(@"%.1f x %.1f - CGEventTap(session, unflipped)", p.x, p.y);
    return event;
}

CGEventRef mouseEventTapHID(CGEventTapProxy proxy, CGEventType type, CGEventRef event, void *refcon) {
    CGPoint p = CGEventGetUnflippedLocation(event);
    NSLog(@"%.1f x %.1f - CGEventTap(HID, unflipped)", p.x, p.y);
    return event;
}

- (void)tapMouseAtLocation:(CGEventTapLocation)location callback:(CGEventTapCallBack)callback {
    CFRunLoopRef runLoop = CFRunLoopGetCurrent();
    if (runLoop == NULL) return;

    CFMachPortRef machPort = CGEventTapCreate(location, kCGHeadInsertEventTap, kCGEventTapOptionListenOnly,
                                              CGEventMaskBit(kCGEventMouseMoved), callback, nil);
    if (machPort == NULL) return;
    
    CFRunLoopSourceRef source = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, machPort, 0);
    if (source == NULL) return;
    
    CFRunLoopAddSource(runLoop, source, kCFRunLoopCommonModes);
}

- (void)periodicMouseLocation {
    CGEventRef event = CGEventCreate(nil);
    CGPoint p = CGEventGetUnflippedLocation(event);
    CFRelease(event);
    NSLog(@"%.1f x %.1f - CGEventGetLocation(periodicMouseLocation)", p.x, p.y);
    [self performSelector:@selector(periodicMouseLocation) withObject:nil afterDelay:2.0];
}

- (void)clickMouse {
    CGEventTapLocation tapLocation = kCGSessionEventTap;
    
    // My close window button position
    CGPoint pt = CGPointMake(250, 530);
    
    CGEventRef theEvent = CGEventCreateMouseEvent(NULL, kCGEventLeftMouseDown, pt, kCGMouseButtonLeft);
    CGEventPost(tapLocation, theEvent);
    CGEventSetType(theEvent, kCGEventLeftMouseUp);
    CGEventPost(tapLocation, theEvent);
    
//    CGEventSetIntegerValueField(theEvent, kCGMouseEventClickState, 2);
//    CGEventSetType(theEvent, kCGEventLeftMouseDown);
//    CGEventPost(tapLocation, theEvent);
//    CGEventSetType(theEvent, kCGEventLeftMouseUp);
//    CGEventPost(tapLocation, theEvent);
    
    CFRelease(theEvent);
    NSLog(@"Clicked");
}

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    // Get some time to zoom & move the cursor
    [self performSelector:@selector(clickMouse) withObject:nil afterDelay:5.0];

    [self monitorMouseLocationNSEvent];
    
    // Monitor via CGEventTap
    [self tapMouseAtLocation:kCGHIDEventTap callback:mouseEventTapHID];
    [self tapMouseAtLocation:kCGSessionEventTap callback:mouseEventTapSession];
    
    [self periodicMouseLocation];
}

@end

//
// Zoom off
//
// 145.9 x 1028.4 - CGEventTap(HID, unflipped)
// 145.9 x 1028.4 - CGEventTap(session, unflipped)
// 145.9 x 1028.4 - NSEvent(Global)
// 145.9 x 1028.4 - CGEventGetLocation(periodicMouseLocation)
//
// Zoom in & viewport moved
//
// -169.1 x 376.1 - CGEventTap(HID, unflipped)
// 291.6 x 512.3 - CGEventTap(session, unflipped)
// 291.6 x 512.3 - NSEvent(Global)
// 291.6 x 512.3 - CGEventGetLocation(periodicMouseLocation)
//