const { ccclass, property, executionOrder } = cc._decorator;
/**
-
截图组件
*/
@ccclass
export default class CaptureWeb extends cc.Component {onLoad(){
}onEnable(){
this.captureAndLongPress();
}onDisable(){
this.removeLongPress();
}//截图
capture () {
let texture = new cc.RenderTexture();
texture.initWithSize(this.node.width, this.node.height);let width = this.node.width; let height = this.node.height; let camera = this.node.addComponent(cc.Camera); camera.targetTexture = texture; let canvas = document.createElement('canvas'); let ctx = canvas.getContext('2d'); canvas.width = width; canvas.height = height; camera.render(this.node); let data = texture.readPixels(); this.node.removeComponent(camera) let rowBytes = width * 4; for (let row = 0; row < height; row++) { let srow = height - 1 - row; let imageData = ctx.createImageData(width, 1); let start = srow*width*4; for (let i = 0; i < rowBytes; i++) { imageData.data[i] = data[start+i]; } ctx.putImageData(imageData, 0, row); } var dataURL = canvas.toDataURL("image/jpeg"); var img = document.createElement("img"); img.src = dataURL; return img;}
//test 主要做测试
captureAndShow () {
var img = this.capture();
let texture = new cc.Texture2D();
texture.initWithElement(img);
let spriteFrame = new cc.SpriteFrame();
spriteFrame.setTexture(texture);
let node = new cc.Node();
let sprite = node.addComponent(cc.Sprite);
sprite.spriteFrame = spriteFrame;
node.zIndex = cc.macro.MAX_ZINDEX;
cc.director.getScene().addChild(node)
node.x = cc.view.getVisibleSize().width/2;
node.y = (cc.view.getVisibleSize().height)/2;
node.on(cc.Node.EventType.TOUCH_START, () => {
node.removeFromParent();
});
}captureAndLongPress(){
let img = this.capture();
this.addLongPress(img)
}//添加到长按保存
addLongPress(bigImg){//添加图片
var gameDiv = document.getElementById(‘Cocos2dGameContainer’);
bigImg.id = ‘QRCode’;
bigImg.alt = ‘bigImg’;let scaleX = parseInt(gameDiv.style.width.replace(/px/, '')) /750; let scaleY = parseInt(gameDiv.style.height.replace(/px/, ''))/1334 bigImg.width = this.node.width * scaleX//parseInt(gameDiv.style.width.replace(/px/, '')) * 0.6; bigImg.height = this.node.height * scaleY//parseInt(gameDiv.style.height.replace(/px/, '')) * 0.6; bigImg.style.position = 'absolute'; bigImg.style.top = parseInt(gameDiv.style.height.replace(/px/, '')) * 0.2+"px";//y坐标 bigImg.style.left = parseInt(gameDiv.style.width.replace(/px/, '')) / 2 - bigImg.width / 2 + "px";//设置图片居中显示 gameDiv.appendChild(bigImg);}
removeLongPress(){
let gameDiv = document.getElementById(‘Cocos2dGameContainer’);
let qrCode = document.getElementById(‘QRCode’);
if(qrCode){
gameDiv.removeChild(qrCode)
}}
}
