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javascript - 在javascript中的两次鼠标单击上绘制连接器

我在下面的代码中动态创建了可拖动的圆圈。我需要使用js在两个可拖动山形圆圈之间创建连接器。我正在使用d3库。单击时，我得到坐标，但不确定如何继续进行。当在任何动态创建的圆圈上单击两次时，应创建一个连接器，并且该连接器也应可拖动。

<!DOCTYPE html>
<html lang="en">
    <head>
      <meta charset="utf-8">
      <script type="text/javascript" src="http://d3js.org/d3.v3.min.js"></script>
      <style type="text/css">
    .mybutton {
    background:#0000FF;
    width:40px;
    height:40px;
    border-radius:20px;
    -khtml-user-drag: element;
    -webkit-user-drag: element;
    }
    #root {
    background:#FFFF00;
    }
    #service{
    background:#00FF00;
    }
    #divContainer, #divResize {
            border:dashed 1px #CCC;
            width:120px;
            height:120px;
            padding:5px;
            margin:5px;
            font:13px Arial;
            cursor:move;
            float:left
        }
    .division{
        border:solid 3px #CCC;
        width:90%;
        height:750px;
        float:right;
    }
    </style>

    </head>
    <body>
        <div id="drawArea" class="division" ></div>
        <div id="firstDivision" >
        <form id="test2">
        <input type="button" id="root" class="mybutton" /> Root <p>
        <input type="button" id="service" class="mybutton"/ > Service<p>
        <input type="button" id="action1" class="mybutton" draggable="true"/ > Action
        </form>
        </div>
        <canvas id="example" class="division">

        </canvas>
        <script type="text/javascript">

          // Create a svg canvas
          var svg = d3.select("#drawArea")
            .append("svg")
          .attr("width", 700)
          .attr("height", 500);

          //Drag nodes
          var drag = d3.behavior.drag()
              .on("dragstart", function() {
                  d3.event.sourceEvent.stopPropagation();
                  d3.select(this).classed("dragging", true);
              })
              .on("drag", dragmove)
              .on("dragend",dragended);

          //First circle
          var g1 = svg.append("g")
            .attr("transform", "translate(" + 150 + "," + 100 + ")")
            .attr("class", "first")
            .call(drag)
            .append("circle").attr({
              r: 20,
            })
            .style("fill", "#FFFF00")

          //Second cicle
          var g2 = svg.append("g")
            .attr("transform", "translate(" + 250 + "," + 300 + ")")
            .attr("class", "second")
            .call(drag)
            .append("circle").attr({
              r: 20,
            })
            .style("fill", "#00FF00")

        svg.on('dblclick', function() {
            var coords = d3.mouse(this);
            console.log(coords);
            drawCircle(coords[0], coords[1]);
        });
        svg.on('click',function(){
            var coords = d3.mouse(this);
            var classFirst = d3.select(this).attr("class");
            drawConnector(coords[0], coords[1]);
        });

        //draw connector
        function drawConnector(x, y) {
        var c=document.getElementById("example");
        var ctx=c.getContext("2d");
        ctx.beginPath();
        ctx.moveTo(150,100);
        ctx.lineTo(250,300);
        ctx.stroke();
        }

        //third circle on click
        function drawCircle(x, y) {
            var g2 = svg.append("g")
            .attr("transform", "translate(" + x + "," + y + ")")
            .attr("class", "action")
            .call(drag)
            .append("circle").attr({
              r: 20,
            })
            .style("fill", "#00F");
        }


          //Drag handler
          function dragmove(d) {
              var x = d3.event.x;
              var y = d3.event.y;
              d3.select(this).attr("transform", "translate(" + x + "," + y + ")");
              if(d3.select(this).attr("class") == "first") {
                /*line.attr("x1", x);
                line.attr("y1", y);*/
                d3.select(this).attr("cx", x);
                d3.select(this).attr("cy", y);
              } else {
                d3.select(this).attr("cx", x);
                d3.select(this).attr("cy", y);
                /*line.attr("x2", x);
                line.attr("y2", y);*/
              }
          }

    function dragended(d) {
    d3.select(this).classed("dragging", false);
    }

        </script>
    </body>
</html>

最佳答案

g1和g2被设置为圆形元素，因此未经调整就无法使用。现在我们可以使用g1和g2来获取圆容器的平移，并使用它来画线。



// Create a svg canvas
var svg = d3.select("#drawArea")
.append("svg")
.attr("width", 700)
.attr("height", 500);

//Drag nodes
var drag = d3.behavior.drag()
.on("dragstart", function() {
  d3.event.sourceEvent.stopPropagation();
  d3.select(this).classed("dragging", true);
})
.on("drag", dragmove)
.on("dragend", dragended);

// ADDED c1 AND c2 below.  g1 AND g2 WERE BEING SET TO CIRCLES.

//First circle
var g1 = svg.append("g")
.attr("transform", "translate(" + 150 + "," + 100 + ")")
.attr("class", "first")
.call(drag);
var c1= g1.append("circle").attr({
  r: 20,
})
.style("fill", "#FFFF00")

//Second cicle
var g2 = svg.append("g")
.attr("transform", "translate(" + 250 + "," + 300 + ")")
.attr("class", "second")
.call(drag);
var c2 = g2.append("circle").attr({
  r: 20,
})
.style("fill", "#00FF00");

// ADD LINE ELEMENT
var line = svg.append("line")
.attr({x1: 150, y1: 100, x2: 250, y2: 300})
.attr({"stroke-width": 2, stroke: "red"});

svg.on('dblclick', function() {
  var coords = d3.mouse(this);
  console.log(coords);
  drawCircle(coords[0], coords[1]);
});
svg.on('click', function() {
  var coords = d3.mouse(this);
  var classFirst = d3.select(this).attr("class");
  drawConnector(coords[0], coords[1]);
});

//draw connector
function drawConnector(g1, g2) {
  // MOVE LINE WITH TRANSFORMS OF G ELEMENTS.
  var t1 = g1.attr("transform").replace(/[^\d.,]/g, "").split(",");
  var t2 = g2.attr("transform").replace(/[^\d.,]/g, "").split(",");
  line.attr({x1: t1[0], y1: t1[1], x2: t2[0], y2: t2[1]});
}

//third circle on click
function drawCircle(x, y) {
  var g2 = svg.append("g")
  .attr("transform", "translate(" + x + "," + y + ")")
  .attr("class", "action")
  .call(drag)
  .append("circle").attr({
    r: 20,
  })
  .style("fill", "#00F");
}


//Drag handler
function dragmove(d) {
  var x = d3.event.x;
  var y = d3.event.y;
  d3.select(this).attr("transform", "translate(" + x + "," + y + ")");
  if (d3.select(this).attr("class") == "first") {
    /*line.attr("x1", x);
             line.attr("y1", y);*/
    d3.select(this).attr("cx", x);
    d3.select(this).attr("cy", y);
  } else {
    d3.select(this).attr("cx", x);
    d3.select(this).attr("cy", y);
    /*line.attr("x2", x);
             line.attr("y2", y);*/
  }
  drawConnector(g1, g2);
}

function dragended(d) {
  d3.select(this).classed("dragging", false);
}

.mybutton {
  background: #0000FF;
  width: 40px;
  height: 40px;
  border-radius: 20px;
  -khtml-user-drag: element;
  -webkit-user-drag: element;
}
#root {
  background: #FFFF00;
}
#service {
  background: #00FF00;
}
#divContainer,
#divResize {
  border: dashed 1px #CCC;
  width: 120px;
  height: 120px;
  padding: 5px;
  margin: 5px;
  font: 13px Arial;
  cursor: move;
  float: left
}
.division {
  border: solid 3px #CCC;
  width: 90%;
  height: 750px;
  float: right;
}

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <script type="text/javascript" src="http://d3js.org/d3.v3.min.js"></script>

</head>

<body>
  <div id="drawArea" class="division"></div>
  <div id="firstDivision">
    <form id="test2">
      <input type="button" id="root" class="mybutton" />Root
      <p>
        <input type="button" id="service" class="mybutton" />Service
        <p>
          <input type="button" id="action1" class="mybutton" draggable="true" />Action
    </form>
  </div>
  <canvas id="example" class="division"></canvas>
</body>

</html>

关于javascript - 在javascript中的两次鼠标单击上绘制连接器，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/32195598/

10-09 21:26
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