graphics2d.scale to make full screen

Newbie & Debugging Questions
#1

suppose we have a game with 320 width , 240 height, with xscale and yscale to 1 then I get the aspect ratio and and I calculate the new scale that match the whole screen keeping the aspect ratio, that works the game is scaled but if the new height and width is 1500 x 1500 im only seeing 320x 240 part on the screen,

any idea why this happen?, how can I scale the game to create some kind of full screen support?

#2

Hi,
Try to change the size of the canvas where you are drawing and all the componentes that contain the canvas.

#3

I’d not deal with the scales of Java2D. When I used to do it, I used to do it with triple buffering. One is the on screen image, and two BufferedImage instances for off screen. I kept the screen image (window) completely resizable. Off screen buffers are in game resolution.

When presenting, I used to calculate the aspect, and find the scales. Then draw the image on the screen with the drawImage method.


// new_(width|height) is the dimension of the scaled image
// bound_(width|height) is the dimension of the window
// original_(width|height) is the dimension of the game resolution

// first check if we need to scale width
if (original_width > bound_width)
{
    //scale width to fit
    new_width = bound_width;
    //scale height to maintain aspect ratio
    new_height = (new_width * original_height) / original_width;
}

// then check if we need to scale even with the new height
if (new_height > bound_height)
{
    //scale height to fit instead
    new_height = bound_height;
    //scale width to maintain aspect ratio
    new_width = (new_height * original_width) / original_height;
}

// Now clear the screen
g2d.setColor(Color.BLACK);
g2d.fillRect(0, 0, bound_width, bound_height);

// Calculate the offset x and offset y
int offsetX = Math.abs((new_width - bound_width) / 2);
int offsetY = Math.abs((new_height - bound_height) / 2);

// Draw the image onto the screen
g2d.drawImage(offScreenImage, offsetX, offsetY, new_width, new_height, this /* window */);

This is what I used to do, and it worked for me perfectly.