[英]Drag a Line in d3
我在d3中創建了一條線,我想拖拽它。
var line = d3.select("svg")
.append("line")
.attr("x1",10)
.attr("y1",10)
.attr("x2",200)
.attr("y2",200)
.attr("stroke-width",10)
.attr("stroke","black")
.call(drag);
我現在遇到的問題是如何從相對於我的鼠標位置的線移動點(x1,y1)(x2,y2),因為我可能也需要dragstart鼠標位置。
let drag = d3.behavior.drag()
.on('dragstart', null)
.on('drag', function(){
// move circle
let x1New = d3.select(this).attr('x1')+ ???;
let y1New = d3.select(this).attr('y1')+ ???;
let x2New = d3.select(this).attr('x2')+ ???;
let y2New = d3.select(this).attr('y2')+ ???;
line.attr("x1",x1New)
.attr("y1",y1New)
.attr("x2",x2New)
.attr("y2",y2New);
})
.on('dragend', function(){
});
我希望你能幫助我。
在你的拖拽功能中這樣做:
.on('drag', function(d){
// move circle
var dx = d3.event.dx;//this will give the delta x moved by drag
var dy = d3.event.dy;//this will give the delta y moved by drag
var x1New = parseFloat(d3.select(this).attr('x1'))+ dx;
var y1New = parseFloat(d3.select(this).attr('y1'))+ dy;
var x2New = parseFloat(d3.select(this).attr('x2'))+ dx;
var y2New = parseFloat(d3.select(this).attr('y2'))+ dy;
line.attr("x1",x1New)
.attr("y1",y1New)
.attr("x2",x2New)
.attr("y2",y2New);
}).on('dragend', function(){
});
在這里工作代碼
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