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JavaScript jQuery Basics (2014) Creating a Simple Drawing Application Perform: Part 5

Maurice Tafolla- Cunningham
Maurice Tafolla- Cunningham
7,708 Points

Nothing is drawing on the canvas

My problem is the title. I'm using Chrome- my code looks exactly the same as Andrew's from what I can tell and nothing is happening. Check out my code.

//Problem: No user inteatcion causes no changwe to application
//Solution: When user interacts causes changes approptiately 

var color = $(".selected").css("background-color");
var $canvas = $("canvas");
var context = $canvas[0].getContext("2d");
// same as document.getElementsByTagName("canvas")[0]
var lastEvent;
var mouseDown = false;

//When clicking on control list items
$(".controls").on("click", "li", function(){

  //Deselect sibling elements

  //Select clicked element

  //cache current color
  color = $(this).css("background-color");

//When "new color" is clicked
  //show color select or hide color select


//update new color span
 function changeColor() {
var r = $("#red").val();
var g = $("#green").val();
var b = $("#blue").val();
$("#newColor").css("background-color", "rgb(" + r + "," + g + "," + b + ")");

//When color sliders change

//When "add color" is pressed

//append the color to the controls ul
 var $newColor = $("<li></li>");
  $newColor.css("background-color", $("#newColor").css("background-color"));
  $(".controls ul").append($newColor);
//select the new color


//On mouse events on the canvas

  lastEvent = e;
  mouseDown = true;
  //Draw lines
if(mouseDown) {
  context.moveTo(lastEvent.offsetX, lastEvent.offSetY);
  context.lineTo(e.offsetX, e.offsetY);
  context.strokeStyle = color;
  lastEvent = e;
 mouseDown = false;      

1 Answer

18,813 Points

Looks like there's just a minor typo in your mouse events.

context.moveTo(lastEvent.offsetX, lastEvent.offSetY); // offSetY should be offsetY (no capital s)

I think that should do it - everything else looks good. Happy coding! :)