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//白底呈現(xiàn)的圖片處理
function processing(canvas) {
    var ctx = canvas.getContext("2d");
    var imgData = ctx.createImageData(canvas.width, canvas.height);
    var arr = imgData.data;
    for (var i = 0, len = data.length; i < len; i += 4) {
        var red = data[i],
            green = data[i + 1],
            blue = data[i + 2],
            alpha = data[i + 3],
            y = 0.299 * red + 0.587 * green + 0.114 * blue; //亮度
        var k = 130;
        arr[i] = y;
        arr[i + 1] = y;
        arr[i + 2] = y;
        arr[i + 3] = alpha * (k - y) / 255;
        if (y > k) {
            arr[i + 3] = 0;
        }
    }
    return imgData;
}
//黑底呈現(xiàn)的圖片處理
function processingBlack(canvas) {
    var ctx = canvas.getContext("2d");
    var imgData = ctx.createImageData(canvas.width, canvas.height);
    var arr = imgData.data;
    for (var i = 0, len = data.length; i < len; i += 4) {
        var red = data[i],
            green = data[i + 1],
            blue = data[i + 2],
            alpha = data[i + 3],
            y = 0.299 * red + 0.587 * green + 0.114 * blue; //亮度
        y = y * 4.5;
        var k = 100;
        arr[i] = y;
        arr[i + 1] = y;
        arr[i + 2] = y;
        arr[i + 3] = alpha * y / 255 * 0.08;
        if (y < 150) {
            arr[i + 3] = 0;
        }
    }
    return imgData;
}

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//下載圖片
function saveImg() {
    var imgUrl = canvas_img.toDataURL("image/png").replace("image/png", "image/octet-stream");
    var a = document.createElement('a');
    a.download = "fun.png";//指明以產(chǎn)生后綴
    a.href = canvas_img.toDataURL();
    a.click();
}
//生成圖片
function createImg() {
    imgBox.innerHTML = "";
    var img = document.createElement("img");
    img.src = canvas_img.toDataURL("image/png");
    imgBox.appendChild(img);
}