freehandTool.js

function FreehandTool(){
	//set an icon and a name for the object
	this.icon = "assets/freehand.jpg";
	this.name = "freehand";

	//to smoothly draw we'll draw a line from the previous mouse location
	//to the current mouse location. The following values store
	//the locations from the last frame. They are -1 to start with because
	//we haven't started drawing yet.
	var previousMouseX = -1;
	var previousMouseY = -1;

	//modified to work with layers
	this.draw = function (pg = currentLayer) {
		//if the mouse is pressed
		if (mouseIsPressed) {
			//check if they previousX and Y are -1. set them to the current
			//mouse X and Y if they are.
			if (previousMouseX == -1) {
				previousMouseX = mouseX;
				previousMouseY = mouseY;
			}
			//if we already have values for previousX and Y we can draw a line from
			//there to the current mouse location
			else {
				pg.line(previousMouseX, previousMouseY, mouseX, mouseY);
				previousMouseX = mouseX;
				previousMouseY = mouseY;
			}
		}
		//if the user has released the mouse we want to set the previousMouse values
		//back to -1.
		//try and comment out these lines and see what happens!
		else {
			previousMouseX = -1;
			previousMouseY = -1;
		}

		//saves after unselecting tool
		this.unselectTool = function () {
			currentLayer.loadPixels();
		};
	};
}