(root)/iphone/tappity : 62 : source/TappityServer.m

- (NSDictionary*) rescaleTouches: (NSDictionary*) event

{

        

        /*

                in "Data"

                +33             num touches

                +48             x-loc 1st touch

                +52             y-loc 1st touch

                +72             x-loc 2nd touch

                +76             y-loc 2nd touch

                

                presumably touches at offsets +24 per touch

        */

 

        

        long type = [[event objectForKey: @"Type"] integerValue];

                

        if (type == 3001) // touch event

        {

                NSMutableDictionary* mdict = [event mutableCopy];

 

                CGRect targetScreen = [[UIScreen mainScreen] bounds];

                CGRect sourceScreen = CGRectFromString([mdict objectForKey: @"UIScreen bounds"]);

                

                float xoff0 = sourceScreen.origin.x;

                float xoff1 = targetScreen.origin.x;

                float yoff0 = sourceScreen.origin.y;

                float yoff1 = targetScreen.origin.y;

                float xs0 = sourceScreen.size.width;

                float xs1 = targetScreen.size.width;

                float ys0 = sourceScreen.size.height;

                float ys1 = targetScreen.size.height;

                

                CGPoint wloc = CGPointMake([[[mdict objectForKey: @"WindowLocation"] objectForKey: @"X"] floatValue], [[[mdict objectForKey: @"WindowLocation"] objectForKey: @"Y"] floatValue]);

                CGPoint loc = CGPointMake([[[mdict objectForKey: @"Location"] objectForKey: @"X"] floatValue], [[[mdict objectForKey: @"Location"] objectForKey: @"Y"] floatValue]);

                

                wloc.x = (wloc.x - xoff0)*(xs1/xs0) + xoff1;

                wloc.y = (wloc.y - yoff0)*(ys1/ys0) + yoff1;

                loc.x = (loc.x - xoff0)*(xs1/xs0) + xoff1;

                loc.y = (loc.y - yoff0)*(ys1/ys0) + yoff1;

                

                [mdict setObject: [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithFloat: wloc.x], @"X", [NSNumber numberWithFloat: wloc.y], @"Y", nil] forKey: @"WindowLocation"];

                [mdict setObject: [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithFloat: loc.x], @"X", [NSNumber numberWithFloat: loc.y], @"Y", nil] forKey: @"Location"];

                

                NSMutableData* data = [[event objectForKey: @"Data"] mutableCopy];

                void* bytes = [data mutableBytes];

                

                uint8_t ntouches = ((uint8_t*)bytes)[33];

                

                for (size_t i = 0; i < ntouches; ++i)

                {

                        size_t ii = 48 + i*24;

                        float x = *((float*)(bytes + ii));

                        float y = *((float*)(bytes + ii+4));

                        

                        x = (x - xoff0)*(xs1/xs0) + xoff1;

                        y = (y - yoff0)*(ys1/ys0) + yoff1;

                        

                        *((float*)(bytes + ii)) = x;

                        *((float*)(bytes + ii+4)) = y;

 

                }

                

                [mdict setObject: data forKey: @"Data"];

                

                [mdict removeObjectForKey: @"UIScreen bounds"];

                event = mdict;

        }

        

        return event;

 

}

 

                        eventDict = [self rescaleTouches: eventDict];