cocoscreator 模拟点击

在制作新手引导或者自动化测试时，有了模拟点击真的方便不少，虽然cocos官方没有提供，但是查看源码还是支持的，这篇文章是转载自：

https://forum.cocos.org/t/topic/83221
https://github.com/ShawnZhang2015/GodGuide/blob/01b5041c255e0ea8dc5cb34ee63f4a4e4c3b344b/assets/GodGuide/GodGuide.js#L25

function getHTMLElementPosition(element) {
    var docElem = document.documentElement;
    var leftOffset = window.pageXOffset - docElem.clientLeft;
    var topOffset = window.pageYOffset - docElem.clientTop;
    if (typeof element.getBoundingClientRect === 'function') {
        var box = element.getBoundingClientRect();
        return {
            left: box.left + leftOffset,
            top: box.top + topOffset,
            width: box.width,
            height: box.height
        };
    }
    else {
        if (element instanceof HTMLCanvasElement) {
            return {
                left: leftOffset,
                top: topOffset,
                width: element.width,
                height: element.height
            };
        }
        else {
            return {
                left: leftOffset,
                top: topOffset,
                width: parseInt(element.style.width),
                height: parseInt(element.style.height)
            };
        }
    }
}

// (x,y)世界坐标(左下角为0,0)
function touchSimulation(x, y) {
    let rect;
    //兼容2.2.x 与 2.3.2
    let inputManager = window._cc ? window['_cc'].inputManager : cc.internal.inputManager;
    if (cc.sys.isBrowser) {
        let canvas = document.getElementById("GameCanvas");
        rect = getHTMLElementPosition(canvas);
    } else {
        rect = cc.view.getFrameSize();
        rect.left = 0;
        rect.top = 0;
    }
    
    let vp = cc.view.getViewportRect();
    let sx = cc.view.getScaleX();
    let sy = cc.view.getScaleY();
    let ratio = cc.view.getDevicePixelRatio();
    let htmlx = (x * sx  + vp.x) / ratio + rect.left;
    let htmly = rect.top + rect.height - (y * sy + vp.y) / ratio;
    let pt = cc.v2(htmlx, htmly);

    cc.log(`模拟点击坐标：${pt.x}, ${pt.y}`);
    let touch = inputManager.getTouchByXY(pt.x, pt.y, rect);
    inputManager.handleTouchesBegin([touch]);
    setTimeout(() => {
        inputManager.handleTouchesEnd([touch]);    
    }, 200);
}