Question

我使用此代码script

对canvas进行了一些下雨效果

    var c = document.getElementById("c");
    var ctx = c.getContext("2d");

    //making the canvas full screen
    c.height = window.innerHeight;
    c.width = window.innerWidth;

    //chinese characters - taken from the unicode charset
    var chinese = "0 1 ";
    //converting the string into an array of single characters
     chinese = chinese.split("");

    var font_size = 10;
    var columns = c.width/font_size; //number of columns for the rain
     //an array of drops - one per column
     var drops = [];
    //x below is the x coordinate
    //1 = y co-ordinate of the drop(same for every drop initially)
     for(var x = 0; x < columns; x++)
    drops[x] = 1; 

    //drawing the characters
    function draw()
  {
//Black BG for the canvas
//translucent BG to show trail
ctx.fillStyle = "rgba(0, 0, 0, 0.05)";
ctx.fillRect(0, 0, c.width, c.height);

ctx.fillStyle = "#0F0"; //green text
ctx.font = font_size + "px arial";
//looping over drops
for(var i = 0; i < drops.length; i++)
{
    //a random chinese character to print
    var text = chinese[Math.floor(Math.random()*chinese.length)];
    //x = i*font_size, y = value of drops[i]*font_size
    ctx.fillText(text, i*font_size, drops[i]*font_size);

    //sending the drop back to the top randomly after it has crossed the screen
    //adding a randomness to the reset to make the drops scattered on the Y axis
    if(drops[i]*font_size > c.height && Math.random() > 0.975)
        drops[i] = 0;

    //incrementing Y coordinate
    drops[i]++;
}
}

 setInterval(draw, 33);

我试图在点击A按钮时产生效果，我希望所有位移动到按钮位置，我尝试了以下代码，但它无法正常工作。我试图阻止下雨，并将所有元素从当前位置移动到点击事件坐标。有任何想法吗？ jsFiddle

HTML画布将所有元素移动到事件单击坐标

0 个答案: