So, the task is to find the coordinates of the mouse over the screen.
#MOUSE COORDINATES JAVASCRIPT FULL#
To see a full list of mouse events, you can visit the Mouse Events MDN docs. There are various mouse events available in JavaScript, out of which we will be focusing on the mousemove event as we want to track mouse position. This means that vertical zero is topmost point and horizontal zero is the leftmost point. For example, a mousedown event is only triggered when a user clicks on the mouse button. There's one more place let to change: the click handler. meaning that when we run this function the next time, prevCoord will be just what it needs to be: the coordinate that was 'mouse overed' the previous time. MousePosition = toPoint(evt.clientX, evt. The top left corner of the screen is (0, 0) i,e, X and Y coordinate is (0, 0). We can use this variable to prepare for the next cycle: on next mouse move, the 'current' will become 'previous'. On mouseup perform all actions related to finishing the drag’n’drop.
Then on mousemove move it by changing left/top with position:absolute. This canvas is fullscreen with no scroll. When a visitor presses the button ( mousedown) remember the distance from the pointer to the left-upper corner of the ball in variables shiftX/shiftY. The basic Drag’n’Drop algorithm looks like this: On mousedown prepare the element for moving, if needed (maybe create a clone of it, add a class to it or whatever).
pageX clientX + width of the scrolled-out horizontal part of the document. The two coordinate systems are connected by the formula: pageY clientY + height of the scrolled-out vertical part of the document. The problem is when I convert mouse position to canvas coordinates it worked correctly but when I convert it back to screen position to render markers on overlay div, the result is not as same as initialized mouse position and recalculate marker's position on resize also not correct. There’s no standard method to get the document coordinates of an element. I'm creating a canvas with an overlay div to add markers on click and I want markers to change position when I pan zoom the canvas or resize the window.
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