import java.awt.Color;

class Lab13aPictsColor {

    
    /** Invert all the pixels in `nums`. */
    static void invert( Color[][] nums ) {
        for ( int r=0;  r < nums.length;  ++r ) {
            // fill in row# `r`
            invert_row( nums, r );
        }
    }

    /** Invert all the pixels in row `r` of `nums`. */
    static void invert_row( Color[][] nums, int r ) {
        for ( int c=0;  c < nums[r].length;  ++c ) {
            invert_pixel(nums, r, c );
        }
    }
    
    /** Invert pixel `r`,`c` of `nums`.
     * Mutates the array. (I.e. changes the value stored in the cell,
     * so a caller with a reference to the array will "see" the change.
     * Doesn't return a value; is void.)
     */
    static void invert_pixel( Color[][] nums, int r, int c ) {
        nums[r][c] = new Color( 255 - nums[r][c].getRed(),
                                255 - nums[r][c].getGreen(),
                                255 - nums[r][c].getBlue() );
    }
    
    
    
    
    static void demo() {
        Color[][] img;
        //data = new int[400][600];
        //fill_pattern(data);
        
        img = Pict.fileToPixelsColor("https://snworksceo.imgix.net/dtc/10ec0a64-8f9d-46d9-acee-5ef9094d229d.sized-1000x1000.jpg?w=1000");
        
        Pict.displayPixels( img );
        invert(img);
        Pict.displayPixels( img );
        
        
    }
    public static void main( String[] __ ) { demo(); }
    
    
}