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How to Retrieve X, Y Coordinates of JavaScript Diagram?
6 mins read
In a JavaScript Diagram, obtaining the X and Y coordinates becomes crucial for various interactive functionalities. While the mouseover event is commonly used when hovering over nodes or connectors, it may not trigger when the mouse is over an empty diagram space. To precisely capture the mouse's position over the entire diagram, the mouseMove event should be employed.
Refer to the following code snippet to understand how to acquire the exact X and Y coordinates of a diagram using the mouseMove event.
The below code utilise the MouseEvent arguments and diagram objects to accurately determine the X and Y coordinates. Adjustments are made for the diagram's position, scale, and transforms to provide precise coordinates.
diagram = new Diagram({
width: '100%', height: '645px', nodes: nodes,
});
diagram.appendTo('#diagram');
function created(): void {
diagram.fitToPage({ mode: 'Width' });
}
function DiagrammouseOver(arg:MouseEvent) {
var offsetX;
var offsetY;
offsetX = arg.clientX;
offsetY = arg.clientY;
var position:Size = new Size();
position = getRulerSize(diagram);
var boundingRect = diagram.element.getBoundingClientRect();
offsetX = offsetX + diagram.diagramCanvas.scrollLeft - boundingRect.left - position.width;
offsetY = offsetY + diagram.diagramCanvas.scrollTop - boundingRect.top - position.height;
offsetX /= diagram.scroller.transform.scale;
offsetY /= diagram.scroller.transform.scale;
offsetX -= diagram.scroller.transform.tx;
offsetY -= diagram.scroller.transform.ty;
console.log('offsetX:' + offsetX + ', offsetY:' + offsetY);
}
function getRulerSize(diagram: Diagram): Size {
let top: number = 0;
let left: number = 0;
if (diagram.rulerSettings.showRulers) {
top = diagram.rulerSettings.horizontalRuler.thickness;
left = diagram.rulerSettings.verticalRuler.thickness;
}
return new Size(left, top);
}
//Enable or disable the AspectRatio for Node.
document.addEventListener('mousemove',DiagrammouseOver)
For a practical demonstration, refer to the sample on StackBlitz.
Conclusion
I hope you enjoyed learning about how to Retrieve X, Y Coordinates of a Diagram.
I hope you enjoyed learning about how to Retrieve X, Y Coordinates of a Diagram.
You can refer to our JavaScript Diagram feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our JavaScript Diagram example to understand how to create and manipulate data.
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