getCursorNDC method
dynamic
getCursorNDC(
- dynamic cursorX,
- dynamic cursorY,
- dynamic canvas
- Calculate the cursor position in NDC
- @param {number} x Cursor horizontal coordinate within the canvas
- @param {number} y Cursor vertical coordinate within the canvas
- @param {HTMLElement} canvas The canvas where the renderer draws its output
- @returns {Vector2} Cursor normalized position inside the canvas
- @param {number} x Cursor horizontal coordinate within the canvas
Implementation
getCursorNDC(cursorX, cursorY, canvas) {
// var canvasRect = canvas.getBoundingClientRect();
var box = listenableKey.currentContext!.findRenderObject() as RenderBox;
var canvasRect = box.size;
var local = box.globalToLocal(Offset(0, 0));
this._v2_1.setX(((cursorX - local.dx) / canvasRect.width) * 2 - 1);
this._v2_1.setY(
(((local.dy + canvasRect.height) - cursorY) / canvasRect.height) * 2 -
1);
return this._v2_1.clone();
}