function configureTool(){
	var curr_toolObj = fl.tools.activeTool;
	curr_toolObj.setIcon("grid.png");
	curr_toolObj.setMenuString("Grid Tool");
	curr_toolObj.setToolName("Grid Tool");
	curr_toolObj.setToolTip("Grid Tool");
	curr_toolObj.setOptionsFile("grid.xml");
}
function activate(){
	curr_toolObj = fl.tools.activeTool;
	rows = curr_toolObj.rows;
	cols = curr_toolObj.cols;
}
function notifySettingsChanged(){
	rows = curr_toolObj.rows;
	cols = curr_toolObj.cols;
}
function setCursor(){
	fl.tools.setCursor(0);
}

function mouseDown(){
	startPoint = fl.tools.penDownLoc;
	transformPoint(startPoint, fl.getDocumentDOM().viewMatrix);
	startPoint = fl.tools.snapPoint(startPoint);
	fl.drawingLayer.beginDraw();
}
function mouseUp(){
	fl.drawingLayer.endDraw();
	var endPoint = fl.tools.penLoc;
	transformPoint(endPoint, fl.getDocumentDOM().viewMatrix);
	endPoint = fl.tools.snapPoint(endPoint);
	constrain45(startPoint, endPoint);
	var curr_doc = fl.getDocumentDOM();
	var gridHeight = endPoint.y - startPoint.y;
	for(var r = 0; r<=rows; r++){
		var offset = gridHeight/rows*r;
		var lineStart = {x:startPoint.x, y:startPoint.y + offset};
		var lineEnd = {x:endPoint.x, y:startPoint.y + offset};
		curr_doc.addNewLine(lineStart, lineEnd);
	}
	var gridWidth = endPoint.x - startPoint.x;
	for(var c = 0; c<=cols; c++){
		offset = gridWidth/cols*c;
		var lineStart = {x:startPoint.x + offset, y:startPoint.y};
		var lineEnd = {x:startPoint.x + offset, y:endPoint.y};
		curr_doc.addNewLine(lineStart, lineEnd);
	}
}
function mouseMove(){
	if(fl.tools.mouseIsDown){
		fl.drawingLayer.beginFrame();
		var penPoint = fl.tools.penLoc;
		transformPoint(penPoint, fl.getDocumentDOM().viewMatrix);
		penPoint = fl.tools.snapPoint(penPoint);
		constrain45(startPoint, penPoint);
		var gridHeight = penPoint.y - startPoint.y;
		for(var r = 0; r<=rows; r++){
			var offset = gridHeight/rows*r;
			fl.drawingLayer.moveTo(startPoint.x, startPoint.y + offset);
			fl.drawingLayer.lineTo(penPoint.x, startPoint.y + offset);
		}
		var gridWidth = penPoint.x - startPoint.x;
		for(var c = 0; c<=cols; c++){
			offset = gridWidth/cols*c;
			fl.drawingLayer.moveTo(startPoint.x + offset, startPoint.y);
			fl.drawingLayer.lineTo(startPoint.x + offset, penPoint.y);
		}
		fl.drawingLayer.endFrame();
	}
}
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 transformPoint(aPoint, matrix){
	var x = aPoint.x * matrix.a + aPoint.y * matrix.c + matrix.tx;
	var y = aPoint.x * matrix.b + aPoint.y * matrix.d + matrix.ty;
	aPoint.x = x;
	aPoint.y = y;
}