How to flip an image in Java ME

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This articles shows how to to flip a given Image in Java ME.

Solution

• Create a new Image using createImage
• Or use drawRegion to fllp the image when drawn.
• Apply Mirror transformation using Sprite.TRANS_MIRROR

On some devices, pre-transformed images may render more quickly than images that are transformed on the fly using drawRegion. However, creating such images does consume additional heap space, so this technique should be applied only to images whose rendering speed is critical.

Sample Code

Imports

import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;

Flip Image

Create a new flipped image with createImage. For immutable source images, transparency information, if any, is copied to the new image unchanged.

public Image flip(Image source)
{        
     return Image.createImage(source,0, 0, source.getWidth(), source.getHeight(), Sprite.TRANS_MIRROR);
}

Or use drawRegion to fllp the image when drawn.

public void drawFlippedImage(Graphics g, Image source)
{
      g.drawRegion(source, 0, 0, source.getWidth(), source.getHeight(), Sprite.TRANS_MIRROR, 0, 0, Graphics.TOP | Graphics.LEFT); 
}

Note

For MIDP 1.0 devices we can use com.nokia.mid.ui.DirectGraphics.drawImage(javax.microedition.lcdui.Image img, int x, int y, int anchor, int manipulation) with manipulation = DirectGraphics.FLIP_HORIZONTAL

--Submitted by Amitabh Srivastava at 16:55(IST), 5 July 2010.

Article Metadata

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Tested with

SDK: Nokia SDK 1.0 for Java

Devices(s): Series 40, Series 60

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Compatibility

Platform(s): MIDP 2.0

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Article

Keywords: Flip, Image, Graphics, Sprite

Created: im2amit (05 Jul 2010)

Updated: tiviinik (18 Jan 2012)

Last edited: hamishwillee (23 Jan 2012)