getColorAtPoint(x, y) {
const ctx = wx.createCanvasContext('myCanvas');
const pixelData = ctx.getImageData(x, y, 1, 1).data;
const color = `rgba(${pixelData[0]}, ${pixelData[1]}, ${pixelData[2]}, ${pixelData[3] / 255})`;
console.log('Selected color:', color);