在 d3js 中移动连接的矩形

Moving connected rectangles in d3js

本文关键字:连接 移动 d3js      更新时间:2023-09-26

我正在尝试在 d3js 中连接两个可拖动的矩形。我的要求是

  1. 具有不同的矩形(例如。A、B、C)
  2. 所有矩形都应该是可拖动的
  3. 当我单击一个矩形时,它应该开始画一条线(例如。如果我先点击 A,该行应该从 A.x、A.y 开始。线端应随鼠标点移动)
  4. 当我在第二个矩形上点击时,该行应以该元素结尾(例如。如果我在A之后点击B,A和B现在应该连接)

到目前为止,我可以拖动矩形,如果它们是静态的,我可以连接它们。但是当我在开玩笑后移动矩形时,线条应该随着矩形移动。

这是我工作的小提琴。谁能指导我到这里?

<svg id="main" width="500" height="500" style="background-color: white">
    <rect id="a" x="100" y="100" height="50" width="50" style="fill: blue"></rect>
    <rect id="b" x="400" y="400" height="50" width="50" style="fill: blue"></rect>
    <line id="c" x1="100" y1="100"  y2="400" x2="400" style="stroke:rgb(255,0,0);stroke-width:2;display:none"></line>
</svg>
    function move() {
        d3.select(this)
                .attr('x', d3.event.x -   parseInt(d3.select(this).attr("width")) / 2)
                .attr('y', d3.event.y - parseInt(d3.select(this).attr("height")) / 2);

    }
 var drag = d3.behavior.drag().on('drag', move);
d3.select("#a").on('mousedown', function(d){
     d3.select("#c").style("display","");//make the line visible when mouse click is down.
}) .call(drag);
d3.select("#b").on('mouseup', function(d){
     d3.select('#c')
        .attr('x2', 400)
        .attr('y2', 400);
//remove all the listeners as we have made the connection line    
    d3.select("#main").on('mousemove',null);
    d3.select("#a").on('mousedown',null);
    d3.select("#b").on('mouseup',null);
}) .call(drag);
d3.select("#main").on('mousemove', function(d){
    //on mouse move update the line.
    var mouseLoc = d3.mouse(this);
    d3.select('#c')
        .attr('x2', mouseLoc[0]-5)
        .attr('y2', mouseLoc[1]-5);
});

您需要相应地使用属性更新行。

下面是一个示例:http://jsfiddle.net/cyril123/kbj4xsmm/12/

var myMapLookup = {c:{ source:'a', target:'b'}};//this will map the line id to its source and target rectangles. this help you track which line is linked to which 2 rectangles.
function move(lineID, me) {
    //lineID will gve the id of the line.
    var nx = d3.event.x-parseInt(d3.select(me).attr("width"))/2
    var ny = d3.event.y-parseInt(d3.select(me).attr("height"))/2
    d3.select(me).attr('x', nx)
                   .attr('y', ny);
    //change the line's x and y on dragging
    //if source update the x1 and y1
    if(d3.select(me).attr('id') == myMapLookup.c.source){
        d3.select('#' + lineID).attr('x1', nx).attr('y1', ny);
    }
    //if source update the x2 and y2
    if(d3.select(me).attr('id') == myMapLookup.c.target){
        d3.select('#' + lineID).attr('x2', nx).attr('y2', ny);
    }
}
d3.select("#a").on('mousedown', function(d){
     d3.select("#c").style("display","");//make the line visible when mouse click is down.
    d3.select("#c").data({src: 'a', target: 'b'})
});
d3.select("#b").on('mouseup', function(d){
     d3.select('#c')
        .attr('x2', 400)
        .attr('y2', 400);
//remove all the listeners as we have made the connection line    
    d3.select("#main").on('mousemove',null);
    d3.select("#a").on('mousedown',null);
    d3.select("#b").on('mouseup',null);
//attach drag listener to all rectangles
    var dragA = d3.behavior.drag().on("drag", function(){move('c', this)});
    d3.select("#a").call(dragA);
    var dragB = d3.behavior.drag().on("drag", function(){move('c', this)});
    d3.select("#b").call(dragB);
});
d3.select("#main").on('mousemove', function(d){
    //on mouse move update the line.
    var mouseLoc = d3.mouse(this);
    d3.select('#c')
        .attr('x2', mouseLoc[0]-5)
        .attr('y2', mouseLoc[1]-5);
});

您可以使用 myMapLookup 来与源矩形和目标矩形进行 rgister 线。这样,您可以有 n 个矩形和 n 条线,并且可以跨相同的拖动代码。