How to clear the text on the image

Hello

I have a screen with the background image (bitmap). I draw the text and other images on this background to aid graphics object and all looks ok when I show the screen - but only the first time because the next time background image is one containing all these designs on it.

I would like to know if it is possible to erase these drawings, so next time I can use background image to draw top again?

I use something like this:

String fText = "Text";

fBackground = Bitmap.getBitmapResource("background.png")

fGraphics = new Graphics (fBackground );

fvm1 = new VerticalFieldManager()
{     

public void paint(Graphics graphics)
{
   fGraphics.drawText(fText, 0, 0);

   graphics.drawBitmap(0, 0, fBackground.getWidth(),  fBackground.getHeight(), fBackground, 0, 0);

   super.paint(graphics);
}
}

Next time I want to draw text 'Text2' so I change variable fText to "Text2". How can I remove the 'Text' text before doing this?

Thanks in advance.

You really want to paint on the bitmap background to show change data.

One of the most obvious solutions is to have fields for that--both the LabelField and RichTextField are good for displaying text, BitmapField is good to display bitmaps (use setBitmap to change the image), GaugeField is ideal for the indication of the percentage, etc..  Add the fields to your VerticalFieldManager, use the margins and the bits of style such as FIELD_HCENTER to space and position them the way you want and enjoy. When comes a new value to display, change the field matching and nullity. This is the right way to do these things.

Of course-, since you seem to be attached to the use of the graphics directly - the quick and dirty approach is just to paint directly on the screen using the Graphics object passed in object.  Something like this:

fBackground = Bitmap.getBitmapResource("background.png")

// fGraphics = new Graphics (fBackground );

fvm1 = new VerticalFieldManager()
{     

public void paint(Graphics graphics)
{
   // fGraphics.drawText(fText, 0, 0);

   graphics.drawBitmap(0, 0, fBackground.getWidth(),  fBackground.getHeight(), fBackground, 0, 0);
   graphics.drawText(fText, 0, 0); // plus any other draws...
   super.paint(graphics);
}
}

Of course, you must also override sublayout() to this VerticalFieldManager to properly define its dimensions.

However, doing it this way is really strange. You must be something much simpler than a VerticalFieldManager to paint in it (expand, replace its layout() setExtent() correctly and his object to do any painting you need - do not call the super.paint (), it is abstract) or you add fields to it as usual and let the super.paint () do its job.

Tags: BlackBerry Developers

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