Cursor on the background Image

I have a complex series of customizable regions that is painted on the background of the screen in an application I'm building.  As I'm painting bitmaps on the screen, I capture the coordinates of each image to a global vector object.  The goal is to capture the X, Y of a user click to determine this graph that was clicked.

Paint works very well and the sets of vector up without any problems and I have a global navigationMovement and navigationClick both seized their appropriate events.

The first problem I have is that I can not understand how to make a cursor of any type appear on the screen, so I have no idea where the cursor is hoisted.

The next issue I'm facing is the X, the values of Y being produced are always 0,1-1,0 and 0,0-, which means that I don't get mouse movements on the screen.

I added a manager of vertical field on the screen (set to use the height and width), but that did not help.

Can someone please help?

The storm is actually a lot easier, because you don't need to keep track of your "position" - it is there where the person touched.  If you need to capture the TouchEvents

protected boolean touchEvent (TouchEvent message) {.}

and determine from the event where x and are and so where you draw your cursor.

The storm no is a little harder, you must override navigationMovement and move your cursor where it is, in the indicated directions.

Once you have determined that your cursor is over, invalidate() screen to redraw the it. This will force through the routine of painting.

Suppose you decide that your cursor is located at "cursorx" on the "superficial" and horizontal axis vertical.  Assume that your cursor is a Bitmap named _cursor (not very original I know).  The "slider" drawing is actually surprisingly easy.  Substitute paint in your screen as follows:

protected void paint (Graphics graphics) {}
Super.Paint (Graphics);

graphics.drawBitmap (cursorx, cursory, _cursor.getWidth (), _cursor.getHeight (), _cursor, 0, 0);

}

Job done.

Finally almost.  The above is simplified.  You will find that you might want to play wide speed real he of the movement, and if he moves directly to the point, or moving it slowly over a number of intervals (call invalidate() to force another refreshment).  You might also want to invalidate() only the area that you need to, so do not redraw the entire screen, just the area that had the slider to remove it and the area that the cursor has moved to.  Also cursorx and superficial in what precedes is the upper-left corner of the cursor, you can center the cursor over the point.

So much more to do, but I hope that you get!

Good luck.

Tags: BlackBerry Developers

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