我需要在浏览器中模拟鼠标拖动事件以拖动d3强制节点。我正在使用它作为webcola力布局求解器的约束错误的解决方法。
可乐主页:http://marvl.infotech.monash.edu/webcola/
之前曾提出类似的问题,但我的申请没有得到令人满意的答复 How to programmatically trigger a D3 drag event?
这是我到目前为止所拥有的:
http://jsfiddle.net/7oc0ez6q/14/
鼠标事件似乎确实在某种程度上起作用,但不是我想要的。我对以下代码的期望是,在每个tick上,每个节点都应该在x和y中拖动几个像素,因为xTest和yTest值会递增。
相反,我看到的是当鼠标移动到结果框架中时,只有一个节点在圆圈中意外移动。显然我不了解如何使用这些虚假鼠标事件。
感谢您的帮助。
var graph = {
"nodes":[
{"name":"a","width":60,"height":40},
{"name":"b","width":70,"height":190},
{"name":"c","width":60,"height":40},
{"name":"d","width":60,"height":80},
{"name":"e","width":60,"height":40}
],
"links":[
{"source":1,"target":2},
{"source":2,"target":0},
{"source":2,"target":3},
{"source":2,"target":4}
],
"constraints":[
{"type":"alignment",
"axis":"x",
"offsets":[
{"node":"1", "offset":"0"},
{"node":"2", "offset":"0"},
{"node":"3", "offset":"0"}
]},
{"type":"alignment",
"axis":"y",
"offsets":[
{"node":"0", "offset":"0"},
{"node":"1", "offset":"0"},
{"node":"4", "offset":"0"}
]}
]
}
var width = 350,
height = 320
var color = d3.scale.category20();
var d3cola = cola.d3adaptor()
.linkDistance(120)
.avoidOverlaps(true)
.size([width, height]);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
graph.nodes.forEach(function (v) { v.x = 400, v.y = 50 });
d3cola
.nodes(graph.nodes)
.links(graph.links)
.constraints(graph.constraints)
.start(10,10,10);
var link = svg.selectAll(".link")
.data(graph.links)
.enter().append("line")
.attr("class", "link");
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("rect")
.attr("class", "node")
.attr("width", function (d) { return d.width; })
.attr("height", function (d) { return d.height; })
.attr("rx", 5).attr("ry", 5)
.style("fill", function (d) { return color(1); })
.call(d3cola.drag);
var label = svg.selectAll(".label")
.data(graph.nodes)
.enter().append("text")
.attr("class", "label")
.text(function (d) { return d.name; })
.call(d3cola.drag);
node.append("title")
.text(function (d) { return d.name; });
var xTest=1;
var yTest=1;
d3cola.on("tick", function () {
xTest+=5;
yTest+=5;
link.attr("x1", function (d) { return d.source.x; })
.attr("y1", function (d) { return d.source.y; })
.attr("x2", function (d) { return d.target.x; })
.attr("y2", function (d) { return d.target.y; });
node.attr("x", function (d) { return d.x - d.width / 2; })
.attr("y", function (d) { return d.y - d.height / 2; });
label.attr("x", function (d) { return d.x; })
.attr("y", function (d) {
var h = this.getBBox().height;
return d.y + h/4;
});
progDrag();
});
function progDrag() {
var evObjStart = document.createEvent('MouseEvents');
var evObj = document.createEvent("MouseEvents");
var evObjEnd = document.createEvent("MouseEvents");
node.each( function (el) {
console.log(evObj);
evObjStart.initMouseEvent("mousedown", true, true, window, 1, xTest, yTest, xTest, yTest, false, false, false, false, 0, null);
evObj.initMouseEvent("mousemove", true, true, window, 1, xTest, yTest, xTest, yTest, false, false, false, false, 0, null);
//evObjEnd.initMouseEvent("mouseup", true, true, window, 1, xTest, yTest, xTest, yTest, false, false, false, false, 0, null);
this.dispatchEvent(evObjStart);
this.dispatchEvent(evObj);
//this.dispatchEvent(evObjEnd);
});
}
答案 0 :(得分:1)
您可以使用以下功能
创建自定义鼠标事件function createCustomMouseEvent (type,x,y) {
var event = document.createEvent("MouseEvents");
event.initMouseEvent(type, true, (type != "mousemove"), window, 0, x, y, x, y, false, false, false, false, 0, document.body.parentNode);
return event;
}
然后d3选择元素并调度mousedown,mousemove和mouseup事件以编程方式实现拖动功能
var node = d3.select('.node').node();
var x = 0.1, y = 0.1;
node.dispatchEvent(createCustomMouseEvent('mousedown', x,y,false));
node.dispatchEvent(createCustomMouseEvent('mousemove', x,y,false));
node.dispatchEvent(createCustomMouseEvent('mouseup', x,y,false));