function configureTool() {
	var curr_toolObj = fl.tools.activeTool;
	curr_toolObj.setIcon("arrow.png");
	curr_toolObj.setMenuString("Arrow Tool");
	curr_toolObj.setToolName("Arrow Tool");
	curr_toolObj.setToolTip("Arrow Tool");
	curr_toolObj.setOptionsFile("arrow.xml");
}
function activate() {
	curr_toolObj = fl.tools.activeTool;
	shaftWidth = curr_toolObj.shaftWidth;
	shaftLength = curr_toolObj.shaftLength;
}
function notifySettingsChanged() {
	shaftWidth = curr_toolObj.shaftWidth;
	shaftLength = curr_toolObj.shaftLength;
}
function mouseDown() {
	startPoint = fl.tools.penDownLoc;
	transform(startPoint, fl.getDocumentDOM().viewMatrix);
	startPoint = fl.tools.snapPoint(startPoint);
	fl.drawingLayer.beginDraw();
}
function mouseMove(){
	if(fl.tools.mouseIsDown){
		fl.drawingLayer.beginFrame();
		var penPoint = fl.tools.penLoc;
		transform(penPoint, fl.getDocumentDOM().viewMatrix);
		penPoint = fl.tools.snapPoint(penPoint);
		constrain45(startPoint, penPoint);
		var w = penPoint.x - startPoint.x;
		var h = penPoint.y - startPoint.y;
		var points = new Array();
		points[0] = {x:startPoint.x, y:startPoint.y - h * shaftWidth};
		points[1] = {x:startPoint.x + w * shaftLength, y:startPoint.y - h * shaftWidth};
		points[2] = {x:startPoint.x + w * shaftLength, y:startPoint.y - h};
		points[3] = {x:penPoint.x, y:startPoint.y};
		points[4] = {x:startPoint.x + w * shaftLength, y:penPoint.y};
		points[5] = {x:startPoint.x + w * shaftLength, y:startPoint.y + h * shaftWidth};
		points[6] = {x:startPoint.x, y:startPoint.y + h * shaftWidth};
		arrow_path = fl.drawingLayer.newPath();
		for (var i = 0; i < points.length; i++) {
			invert(points[i], fl.getDocumentDOM().viewMatrix);
			arrow_path.addPoint(points[i].x, points[i].y);
		}
		arrow_path.close();
		fl.drawingLayer.drawPath(arrow_path);
		fl.drawingLayer.endFrame();
	}
}

function mouseUp() {
	fl.drawingLayer.endDraw();
	arrow_path.makeShape();
}
function constrain45(p1, p2) {
	if (fl.tools.shiftIsDown) {
		var dx = Math.abs(p2.x - p1.x);
		var dy = Math.abs(p2.y - p1.y);
		var offset = Math.max(dx, dy);
		if (p2.y < p1.y) {
			p2.y = p1.y - offset;
		}
		else {
			p2.y = p1.y + offset;
		}
		if (p2.x > p1.x) {
			p2.x = p1.x + offset;
		}
		else {
			p2.x = p1.x - offset;
		}
	}
}
function transform( pt,  mat )
{
	var x = pt.x*mat.a + pt.y*mat.c;
	var y = pt.x*mat.b + pt.y*mat.d;
	pt.x = x;
	pt.y = y;
}
function invert( pt,  mat )
{
	var det = mat.a*mat.d-mat.b*mat.c;
	var x = pt.x * mat.d/det + pt.y * -mat.c/det;
	var y = pt.x * -mat.b/det + pt.y * mat.a/det;
	pt.x = x;
	pt.y = y;
}