image should be moved using mouse in a particular area

i took a uiview application.i placed a image on the controller's view.my requirement is the image should be movable with the help of mouse.mouse should select the image and the image should be moved as 开发者_JAVA技巧the mouse is dragged.the image movement should be restricted to only a particular portion of the view. can someone help me code the desirable task tnx in advance

dinakar

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Dinakar i am very sorry to tell you that there is no mouse (cursor) in iphone or ipad.

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robin is right.mouse cursor just use as a touch for simulator so these are not separate events

you need to read tutorials for moving images.see this link.

This will be help you.

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This can be accomplished with touchesBegan and touchesMoved events.

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{
    // This gets you starting position of 
    UITouch *touch = [ [ event allTouches ] anyObject ] ;   

    float touchXBeginPoint = [ touch locationInView:touch.view ].x ;
    float touchYBeginPoint = [ touch locationInView:touch.view ].y ;

    // Calculate the offset between the current image center and the touched points.
    //  Moving image only along X - direction and try thinking as how to move in 
    // any direction using this as a reference. It isn't that hard.

    touchOffset = image.center.x - touchXBeginPoint ;
    // touchOffset should be a member variable of class or a variable with global scope

} 

- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    // Calculate the difference from previous position and the current position
    // Add this difference to the previous point and move the image center to that point.
    // How ever, you should have an UIImageView outlet connected on to the image placed
    // on the interface builder.

    // And regarding image movement restriction, since you always have co-ordinates with
    // you, you can set the boundaries.

    UITouch *touch = [ [ event allTouches ] anyObject ] ;

    float distanceMoved =( [ touch locationInView:touch.view ].x + touchOffset ) -  image.center.x  ;
    float newX = image.center.x + distanceMoved ;

    if( newX > 30 && newX < 290 ) // setting the boundaries
        image.center = CGPointMake(newX, image.center.y) ;
}

Hope this should be helpful.