Resize a bitmap

[goulamass]

Hi everyone,

I'd like to know how can I change the size of a bitmap.

For example I create a Bitmap like this :

Bitmap bmp = new Bitmap(40,40);

Then I want to recover a bitmapfield so :

BitMapField picture = new BitmapField(bmp.getBitmapResource("Picture.PNG"));

But I have a bitmapfield with the size of the Picture.PNG and not as I chose before.

What is the way to resize as I want???

[sajika]

You can use net.rim.device.api.system.EncodedImage class to scale down an image

EncodedImage ei = EncodedImage.getEncodedImageResource("image.png");   
ei.setScale(2); //half the size   
BitmapField bmp = new BitmapField(ei.getBitmap());   
add(bmp);

But I don't think this class supports resizing to any arbitrarly size. The only other way I can think of is overriding the paint() method of the BitmapField class and then using Graphics.drawBitmap... Well, other than using photoshop

[CELITE]

use scaleImage32 to set it to an arbitrary size

[goulamass]

Thanks but as I don't want to lose the size's scale I will use setScale.

[goulamass]

Hum in fact my picture is on the web and I recover a bitmap from the url.

And as I see on the API, the EncodedImage doesn't take a bitmap in entry, does it???

[goulamass]

Hum allright I just find.

In fact my function recovering the bitmap use byte[] and EncodedImage.

So I just create a function that return the encodedImage instead of a bitmap

[goulamass]

Hum I like to have some explanation about the setScale.

EncodedImage emgphoto = maptmp.getImage(link);
int heightemg = emgphoto.getHeight();
int widthemg = emgphoto.getWidth();
while(heightemg > 50 && widthemg > 50)
{
    emgphoto.setScale(2);
    heightemg = emgphoto.getHeight();
    widthemg = emgphoto.getWidth();
}

Here I have an infinite loop.

I will check the heightemg and the widthemg

[goulamass]

After checking, my two variables never change.

What is wrong???

[Ivanov]

setScale() sets only the scale factor. The scaling itself will be done when calling getBitmap().

[goulamass]

Hum but as the encoded Image I will recover hasn't a size define I have to make more test.

But I think I see.

Thanks all for your answer.

[goulamass]

So I show my solution if someone needs it

int heightemg = emgphoto.getHeight();
int widthemg = emgphoto.getWidth();
int comp = 1;
while(heightemg > 50 && widthemg > 50)
{
    comp++;
    heightemg = heightemg / 2;
    widthemg = widthemg / 2;
}
emgphoto.setScale(comp);

[goulamass]

erratum.

My code is wrong ont the comp.

The correct line is :

comp = comp * 2;