stdlib.blr

/* stdlib.blr, authored by Tim Goodwin-tlg2132 and Dexter Callender-dec2148 */

void display(char[][] cv) {
     int width = len(cv);
     int height = len(cv[0]);
     for(i = 0; i < width; i = i + 1){
	for( j = 0; j < height; j = j + 1){
            print( cv[i][j] );
	}
	println(" ");
    }
}
    
int[][] edgeDetect(string x, int edgeDist){
    int[][] image = readGrayscaleImage(x);
    int width = len(image);
    int height = len(image[0]);

    int leftPixel = -1;
    int rightPixel = -1;
    int bottomPixel = -1;

    int distance = -1;    
    int black = 0;

    int row;
    int col;
    for(row=0; row<width; row=row+1){
	for(col=0; col<height; col=col+1){
	    black = 0;
	    leftPixel = image[row][col];

	    if (col < height-1){
		rightPixel = image[row][(col+1)];	
	        distance = pixelDistance( leftPixel, rightPixel );	
		if(distance > edgeDist){
		    black = 1;
		}
	    }

	    if(row < width-1){
		bottomPixel = image[(row+1)][col];
	        distance = pixelDistance( leftPixel, bottomPixel );	
		if (distance > edgeDist){
		    black = 1;
		}
	    }

	    if( black == 1 ){
		image[row][col] = 1;
	    }else{
	        image[row][col] = 0;
	    }
	
	}
    }

    for(row=0; row<width; row=row+1){
	for(col=0; col<height; col=col+1){
            print( image[row][col]  );
	}
	println("");
    }

    return image;
}


int pixelDistance( int x, int y ){
    int distance; 
    if( x > y ){
	distance = x - y;
    }else{
	distance = y - x;	
    }
    return distance;
}

char[][] dither(string imageFile) {
        int[][] a = readGrayscaleImage(imageFile);
        char[][] b = canvas(imageFile);
        int width = len(a);
        int height = len(a[0]);
        char c = intensityToChar(255);
        println(c);
        println(width);
        println(height);
        int i;
        int j;
        char px;
        for(i = 0; i < width; i = i + 1) {
                for(j = 0; j < height; j = j + 1) {
                        px = intensityToChar(a[i][j]);
			b[i][j] = px;
                }
        }
	return b;
}

char[][] impose(char[][] asciiArt, int[][] edges, char edgeChar){
    int width = len(asciiArt);
    int height = len(asciiArt[0]);
    int i;
    int j;
    for(i = 0; i < width; i = i + 1){
	for( j = 0; j < height; j = j + 1){
	    if( edges[i][j] == 1 ){
		asciiArt[i][j] = edgeChar;		
		print( edgeChar );
	    }
	    else{
		print( asciiArt[i][j] );
	    }
	}
	println(" ");
    }    
    return asciiArt;
}