* event An event generate by an event listener. To create my custom cursor, all I had to do was create a JComponent, and then override the paintComponent. Creating a custom Java mouse cursor like this turned out to be pretty simple, though it definitely helps to have a great book like Filthy Rich Clients at your disposal.

* return the location of the click (or another mouse event) relative to the given element (to increase accuracy). My Java custom mouse cursor to display the mouse x/y coordinates.

Now that we can get the location of the canvas, the following method will be the one that cares about the location of the click on the canvas (or another mouse event attached to the canvas) : /** The previous method returns the location (an object with x and y coordinates) of the element given as first parameter (canvas in this case) in the document. If you want to get the mouse position using JavaScript, you can use the MouseEvent property called clientX. * Return the location of the element (x,y) being relative to the document. However this function will be internally used by the function that is going to retrieve the location of the click. Use the following function to retrieve the location of the element (in this case the canvas) , it expects the DOM element as first parameter. Let's get started ! Retrieving mouse location on eventĪs there are many possible errors and things that the user could do, we need to be exact as possible, therefore to guarantee that the mouse coordinates are reliable, we are going to retrieve them according to the location of the canvas. Use the coordinates to select the data on the canvas.Retrieve the location of the mouse event.To retrieve the color from a pixel of a specific canvas, we are going to :

This task is relatively easy to achieve using pure javascript without any kind of library. There are many utilities that you could create if you would be able to extract the color from a single pixel of a canvas, an interactive color picker etc.

Java get mouse coordinates