/*
1. crop_topleft_position.x
2. crop_topleft_position.y
3. crop_width
4. crop_height
5. bounding_width
6. bounding_height
*/
function error( crop_topleft_positionX, crop_topleft_positionY, crop_width, crop_height, bounding_topleft_positionX, bounding_topleft_positionY, bounding_width, bounding_height ){
    var error=0;

    boundingCenter={x:getCenterX (bounding_topleft_positionX, bounding_width), y:getCenterY (bounding_topleft_positionY, bounding_height)}

    crop_topLeft={x:crop_topleft_positionX,y:crop_topleft_positionY};

    crop_topRight={x:get_topRightX(topLeft.x, crop_width),y:get_topRightY(topLeft.y)};

    crop_bottomRight={x:get_bottomRightX(topLeft.x, crop_width),y:get_bottomRightY (topLeft.y, crop_height)};

    crop_bottomLeft={x:get_bottomLeftX(topLeft.x),y:get_bottomLeftY (topLeft.y, crop_height)};

    fixedHalfDiagonal=0.5*((bounding_width^2+bounding_height^2)^0.5);

    distanceTopLeft=distanceBtwPoints(boundingCenter, crop_topLeft);
    distanceTopRight=distanceBtwPoints(boundingCenter, crop_topRight);
    distanceBottomLeft=distanceBtwPoints(boundingCenter, crop_bottomLeft);
    distanceBottomRight=distanceBtwPoints(boundingCenter, crop_bottomRight);

    diffTopLeft=Math.abs(distanceTopLeft-fixedHalfDiagonal);
    diffTopRight=Math.abs(distanceTopRight-fixedHalfDiagonal);
    diffBottomLeft=Math.abs(distanceBottomLeft-fixedHalfDiagonal);
    diffBottomRight=Math.abs(distanceBottomRight-fixedHalfDiagonal);

    errorTopLeft=(diffTopLeft/fixedHalfDiagonal)*100;
    errorTopRight=(diffTopRight/fixedHalfDiagonal)*100;
    errorBottomLeft=(diffBottomLeft/fixedHalfDiagonal)*100;
    errorBottomRight=(diffBottomRight/fixedHalfDiagonal)*100;

    error=max(errorTopLeft, errorTopRight, errorBottomLeft, errorBottomRight);
    return error;
}

function distanceBtwPoints(pointA, pointB){
    var dist=((pointB.x-pointA.x)^2+(pointB.y-pointA.y)^2)^0.5;
    return dist;
}

function getCenterX (topLeftX, width){
    var centerX;
    centerX=topleftX+width/2;
    return centerX;
}

function getCenterY (topLeftY, height){
    var centerY;
    centerY=topleftY+height/2;
    return centerY;
}

function get_topRightX (topLeftX, width){
    var topleftX;
    topleftX=topleftX+width;
    return topleftX;
}

function get_topRightY (topLeftY){
    return topleftY;
}

function get_bottomRightX (topLeftX, width){
    var bottomRightX;
    bottomRightX=topLeftX+width;
    return bottomRightX;
}

function get_bottomRightY (topLeftY, height){
    var bottomRightY;
    bottomRightY=bottomRightY+height;
    return bottomRightY;
}

function get_bottomLeftX (topLeftX){
    return topLeftX;
}

function get_bottomLeftY (topLeftY, height){
    var bottomLeftY;
    bottomLeftY=bottomLeftY+height;
    return bottomLeftY;
}