Question

请问我想知道如何在两个带有画布的图标之间绘制一条线，这些图标可以通过图标的移动进行拖动和调整大小？我有一个图标列表，我将使用这些图标制作架构。当我将这些图标从列表拖到另一个div时，我想用一条线连接它们，这条线必须可以通过图标的移动进行调整和拖动。这是用画布绘制一条线的完整代码，但它错过了这条线的可调整大小和可拖动性

jsbin.com/hasuqehupo/1/edit?html,js,output

<!DOCTYPE html>
<html>
<head>
<title>test Line</title>
<style type="text/css">
canvas {
    border: 5px dashed rgb(205, 200, 200);
}
</style>
</head>
<body>
<canvas id="canvas" width="1000" height="500"></canvas>
<!--ScriptDrawLine-->
<script type="text/javascript" id="Line">
var clicks = 0;
var lastClick = [0, 0];

document.getElementById('canvas').addEventListener('click', drawLine, false);

function getCursorPosition(e) {
    var x;
    var y;

    if (e.pageX != undefined && e.pageY != undefined) {
        x = e.pageX;
        y = e.pageY;
    } else {
        x = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
        y = e.clientY + document.body.scrollTop + document.documentElement.scrollTop;
    }

    return [x, y];
    }

function drawLine(e) {
    context = this.getContext('2d');

    x = getCursorPosition(e)[0] - this.offsetLeft;
    y = getCursorPosition(e)[1] - this.offsetTop;

    if (clicks != 1) {
        clicks++;
    } 
    else {
        context.beginPath();
        context.moveTo(lastClick[0], lastClick[1]);
        context.lineTo(x, y, 6);
        context.strokeStyle = '#000000';
        context.stroke();
        clicks = 0;
    }

        lastClick = [x, y];
    };
</script>
<!--ScriptDrawLine-->

</body>
</html>

用画布绘制可拖动和可调整大小的线条

0 个答案: