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BrianJensen

Loading only part of an image

4 posts in this topic

[code]
Block = getImage(this.getClass().getResource("/Sprites/maptiles.png"));
[/code]

Is the code I use to load an image. Is there a way to only load a portion of the png file to Block. Trying to take a tile set and put it into an array without splitting the image physically and loading it that way.

Thanks.

I was trying to use a bufferedImage but couldn't figure out how to draw that buffered image to the "screen"
tried
[code]
g.drawImage(Block, 0, 0, this);
[/code]
and tried
[code]
Graphics2D g2 = (Graphics2D)g;
g2.drawImage(Block, 0, 0, this);
[/code]

and google is failing me today.
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Take a look at the JavaDoc of drawImage(). You can specify the source rectangle to draw. So, no need to split up while loading.
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So rather than drawing the image like
[code]
public void paint(Graphics g)
{
Graphics2D g2 = (Graphics2D)g;
g2.drawImage(Block, 0, 0, this);
}
[/code]

I would
[code]
public void paint(Graphics g)
{
g.drawImage(Block, 0, 0, 32, 32, 64, 64, 96, 96, this);
}
[/code]

to draw the part of the image from 64, 64, 96, 96 to 0, 0, 32, 32 ? nice. I didn't see that there were more than one form of drawImage. You sir rock that worked.

Am I able to take those sections of the image and put them into another image or do I have to use a BufferedImage? And if I have to use BufferedImage how would I draw that BufferedImage. I would like to put the smaller images into an array. or should I just create a loop for the drawing of each tile and it's location rather than putting the tileset image into an array?
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[quote name='0Circle0' timestamp='1327067869' post='4904573']
Am I able to take those sections of the image and put them into another image or do I have to use a BufferedImage? And if I have to use BufferedImage how would I draw that BufferedImage. I would like to put the smaller images into an array.
[/quote]
You could do that, but is there any specific reason for that approach ?
I keep all tiles in one image and only put the image rectangles in separate tile objects.
Also take a look at VolatileImage to benefit from hardware support.

To create new empty images:
GraphicsConfiguration#createCompatibleImage()
GraphicsConfiguration#createCompatibleVolatileImage()
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There's another way. If you are thinking of a spritesheet, which i believe you are, use BufferedImages.

E.g.[CODE]

BufferedImage sheet = ImageIO.read(Class.class.getResource(url));

bufferedImage tile = grabTile(sheet, xpos, ypos, width, height);

public bufferedImage grabTile(BufferedImage sheet, int xpos, int ypos, int width, int height){
return sheet.grabSubImage(xpos, ypos, width, height);
}
[/CODE]

I believe the above is correct, currently i am unable to see an IDE to check.
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