Java Tips - How to implement Zoom in and Zoom out

This Java tip implements Zoom in and zoom out feature on an Image (Image Zoomer). This tip may help game developers to add various new kinds of appearances in games. This may also be useful for customized J2ME applications developed for mobile handsets.


public Image ZoomIn(Image img) {

    

    Image outImg = null;

    int[] rgbOutput = null;

    

    Graphics g = null;

    int width = 0,height = 0;

    

    try{

        

        width = img.getWidth();

        height = img.getHeight();

        outImg  = Image.createImage(height,width);

        int rgbInput[]=new int[width*height];

        rgbOutput = new int[width*height];

        img.getRGB(rgbInput,0,width,0,0,width,height);

        

        int i,j,k,l;

        k=0;

        int tempArr[][]  = new int[height][width];

        

        for(i=0;i<height;i++)

            for(j=0;j<width;j++)

                tempArr[i][j] = rgbInput[k++];

        

        k=0;

        for(i=0;i<height;i++) {

            for(j=0;j<width;j++) {

                rgbOutput[k]= tempArr[j][i];

                k++;

            }

        }

        g = outImg.getGraphics();

        

    } catch(Exception e){}

    

    return outImg.createRGBImage(rgbOutput,height,width,true);

}



public Image zoomImage(Image img) {

    

    image outImg = null;

    

    int[] rgbOutput = null;

    Graphics g = null;

    int width = 0,height = 0;

    

    try {

        

        width  =  img.getWidth();

        height = img.getHeight();

        

        outImg  = Image.createImage(width<<1,height<<1);

        

        int rgbInput[]=new int[width*height];

        rgbOutput = new int[(width<<1)*(height<<1)];

        

        img.getRGB(rgbInput,0,width,0,0,width,height);

        

        int i,j,k;

        k=0;

        for(i=0;i<(height<<1);i+=2) {

            for(j=0;j<(width<<1);j+=2) {

                rgbOutput[i*(width<<1) + j] = rgbInput[k] ;

                rgbOutput[(i+1)*(width<<1) + j]  = rgbInput[k];

                rgbOutput[i*(width<<1) + j+1]  = rgbInput[k];

                rgbOutput[(i+1)*(width<<1) + j+1]  = rgbInput[k];

                k++;

            }

        }

        

        g = outImg.getGraphics();

    } catch(Exception e){}

    

    return outImg.createRGBImage(rgbOutput,width<<1,height<<1,true);

}

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