[英]d3js Moving SVG elements inside a transforming group
我正在研究一个查询生成器项目。 我正在尝试使用d3.js构建查询生成器。 我陷入了要在转换组内移动某些元素的部分。 这是回购协议 ,我被困在此功能中 。 连接后,我想移动操作员并更新连接的线。 谁能帮我?
var circleDrag = d3.behavior.drag()
.on('dragstart', function () {
d3.event.sourceEvent.stopPropagation();
})
.on('drag', function () {
var parentQboxGroupId = d3.select(this).select(function () {
return this.parentNode;
});
var grandParent = parentQboxGroupId.select(function(){
return this.parentNode;
});
var drawingGroup = d3.select('#'+grandParent.attr('id'));
var currentC = d3.select(this);
dragging = true;
drawingGroup
.select('.lineInsideQbox')
.attr('x1', currentC.attr('cx'))
.attr('y1', currentC.attr('cy'))
.style('stroke','green')
.style('stroke-width','2px');
dummyLine.src = currentC.attr('id');
console.log('CIRCLE IS BEING DRAGGED' + JSON.stringify(dummyLine));
})
.on('dragend', function () {
console.log('drag circle end');
//if(!selectedCircle.id){
// dummyLine.target = selectedQbox.id;
//}
dummyLine.target = selectedCircle.id;
dragging = false;
console.log('DRAG END : SELCTED NODE : '+ JSON.stringify(selectedCircle));
console.log('DRAG END : DUMMY LINE : '+ JSON.stringify(dummyLine));
var targetNode = d3.select('#'+dummyLine.target);
var srcNode = d3.select('#'+dummyLine.src);
console.log('split : ' + dummyLine.src.split('--'));
var group = '#' + (dummyLine.src).split('--')[1];
console.log('G: ' + group);
d3.select(group).append('line')
.attr('id', function () {
var a = (dummyLine.src).split('--');
var b = (dummyLine.target).split('--');
if( a[0]== 'nodeRight'){
return dummyLine.src + '__' + dummyLine.target;
}else{
return dummyLine.target + '__' + dummyLine.src;
}
})
.attr('class', function () {
var a = (dummyLine.src).split('--');
var b = (dummyLine.target).split('--');
return 'line '+ a[1]+' '+b[1];
})
.attr('x1', srcNode.attr('cx'))
.attr('y1',srcNode.attr('cy'))
.attr('x2',targetNode.attr('cx'))
.attr('y2',targetNode.attr('cy'))
.style('stroke', 'black')
.style('stroke-width', '3px')
;
dummyLine.src = null;
dummyLine.target = null;
});
编辑:当我尝试删除查询框。 我可以在其中放其他运算符。 然后,我应该可以将它们连接到内部。 这是显示我正在尝试的图像。
建立连接后,我尝试分别移动大型操作箱和小型操作员。 那就是代码中断的地方。
主要问题是要移动运算符,请使用平移来移动整个组(标签),其中包括图像,两个圆圈和一条直线。 然后,使用连接的另一运算符的CX,CY值设置该行的另一端。 这将行不通,因为执行平移时不会更新圆的CX和CY值,因此,第二步移动时,会将x,y值放在圆的原始点,而不是移动的点。 要解决,而不是翻译整个组,只翻译图像,更新圆的cx和cy值,然后使用新的圆cx,cy更新线x,y值:
所有需要的修改都在您的operatorDrag.js文件中。 首先,当您添加圆时,添加一个属性,该属性包含原始的cx和cy值。 在计算新的cx时需要这些,在拖动运算符时需要cy:
从此更改:
var op = currGroup
.append('image')
.attr('class', 'operator')
.attr('width', elem.attr('width') * 0.75)
.attr('height', elem.attr('height') * 0.75)
.attr('x', d3.mouse(this)[0])
.attr('y', d3.mouse(this)[1])
.attr('xlink:href', elem.attr('href'));
currGroup
.append('circle')
.attr('class', 'node nodeLeft')
.attr('id', function () {
return 'nodeLeft--' + currGroup.attr('id');
})
.attr('cx', op.attr('x'))
.attr('cy', op.attr('height') / 2 + Number(op.attr('y')))
.attr('r', 5)
.style('fill', 'red')
.on('mouseover', function () {
selectedCircle = {
id: d3.select(this).attr('id'),
cls: 'nodeLeft'
}
})
.call(circleDrag)
;
currGroup
.append('circle')
.attr('class', 'node nodeRight')
.attr('id', function () {
return 'nodeRight--' + currGroup.attr('id');
})
.attr('cx', Number(op.attr('x')) + Number(op.attr('width')))
.attr('cy', op.attr('height') / 2 + Number(op.attr('y')))
.attr('r', 5)
.style('fill', 'red')
.on('mouseover', function () {
selectedCircle = {
id: d3.select(this).attr('id'),
cls: 'nodeRight'
}
})
.call(circleDrag)
;
为此(更新的代码包含在以#SB开头的注释中):
var op = currGroup
.append('image')
.attr('class', 'operator')
.attr('width', elem.attr('width') * 0.75)
.attr('height', elem.attr('height') * 0.75)
.attr('x', d3.mouse(this)[0])
.attr('y', d3.mouse(this)[1])
.attr('xlink:href', elem.attr('href'));
currGroup
.append('circle')
.attr('class', 'node nodeLeft')
.attr('id', function () {
return 'nodeLeft--' + currGroup.attr('id');
})
.attr('cx', op.attr('x'))
.attr('cy', op.attr('height') / 2 + Number(op.attr('y')))
// #SB: add a reference to the original cx and cy position.
// we will need it to set new cx cy when moving operator
.attr('data-cx', op.attr('x'))
.attr('data-cy', op.attr('height') / 2 + Number(op.attr('y')))
//----------------------------------------------------------------------
.attr('r', 5)
.style('fill', 'red')
.on('mouseover', function () {
selectedCircle = {
id: d3.select(this).attr('id'),
cls: 'nodeLeft'
}
})
.call(circleDrag)
;
currGroup
.append('circle')
.attr('class', 'node nodeRight')
.attr('id', function () {
return 'nodeRight--' + currGroup.attr('id');
})
.attr('cx', Number(op.attr('x')) + Number(op.attr('width')))
.attr('cy', op.attr('height') / 2 + Number(op.attr('y')))
// #SB: add a reference to the original cx and cy position.
// we will need it to set new cx cy when moving operator
.attr('data-cx', Number(op.attr('x')) + Number(op.attr('width')))
.attr('data-cy', op.attr('height') / 2 + Number(op.attr('y')))
//----------------------------------------------------------------------
.attr('r', 5)
.style('fill', 'red')
.on('mouseover', function () {
selectedCircle = {
id: d3.select(this).attr('id'),
cls: 'nodeRight'
}
})
.call(circleDrag)
;
完成此操作后,请转到操作员的拖动方法。 这是我们要更改的代码:
.on('drag', function () {
var g = d3.select(this);
var currentOp = g.select('.operator');
var parent = g.select(function () {
return this.parentNode;
}).select('.qbox');
var dx = d3.event.x;
var dy = d3.event.y;
var mouse = {dx: d3.event.x, dy: d3.event.y};
var currentObj = {
x: currentOp.attr('x'),
y: currentOp.attr('y'),
width: currentOp.attr('width'),
height: currentOp.attr('height')
};
var parentObj = {
x: parent.attr('x'),
y: parent.attr('y'),
width: parent.attr('width'),
height: parent.attr('height')
};
//console.log('parent width : ' + parent.attr('width'));
//console.log('parent width : ' + currentOp.attr('width'));
//g.attr('transform', 'translate(' + x + ',' + y + ')');
var loc = getXY(mouse, currentObj, parentObj);
g.attr('transform', 'translate(' + loc.x + ',' + loc.y + ')');
d3.select('#' + g.attr('id')).selectAll('.line')[0].forEach(function (e1) {
var line = d3.select(e1);
console.log('-------------------');
console.log('line : ' + line.attr('id'));
console.log('-------------------');
var split = line.attr('id').split('__');
if(g.attr('id') == split[0]){
//change x2, y2
var otherNode = d3.select('#'+split[1]);
line.attr('x2', otherNode.attr('cx'));
line.attr('y2', otherNode.attr('cy'));
}else{
var otherNode = d3.select('#'+split[0]);
line.attr('x1', otherNode.attr('cx'));
line.attr('y1', otherNode.attr('cy'));
}
})
}))
第一件事是,不翻译整个对象,仅翻译图像:
var g = d3.select(this);
var currentOp = g.select('.operator');
var parent = g.select(function () {
return this.parentNode;
}).select('.qbox');
//#SB: added a reference to the parent id
var parent_id = g.select(function () {
return this.parentNode;
}).attr('id');
//---------------------------------------
var dx = d3.event.x;
var dy = d3.event.y;
var mouse = {dx: d3.event.x, dy: d3.event.y};
var currentObj = {
x: currentOp.attr('x'),
y: currentOp.attr('y'),
width: currentOp.attr('width'),
height: currentOp.attr('height')
};
var parentObj = {
x: parent.attr('x'),
y: parent.attr('y'),
width: parent.attr('width'),
height: parent.attr('height')
};
var loc = getXY(mouse, currentObj, parentObj);
//#SB: Do not translate everything, the cx, cy values of the circle are not updated
// when translating which will make future moves calculate incorrectly
g.selectAll('image').attr('transform', 'translate(' + loc.x + ',' + loc.y + ')');
然后,不要平移圆,而是使用原始cx,cy和translate值更改其cx和cy值:
g.selectAll('circle')
.attr('cx', function () {
return parseFloat(d3.select(this).attr('data-cx')) + parseFloat(loc.x);
})
.attr('cy', function () {
return parseFloat(d3.select(this).attr('data-cy')) + parseFloat(loc.y);
});
最后一件事是更新行。 在原始代码中,您选择了运算符组中的所有行,但实际上仅选择此组将错过某些行。 某些线路可以是另一个操作员组的一部分,但可以连接到正在移动的操作员。 在这种情况下,我们应该选择父组中的所有线路,并检查线路是否连接到我们要移动的操作员。 如果已连接,则我们更新x和y值:
//#SB: Select all the lines in the parent group instead of only group of the
// operator we are moving. There can be lines that exists on other groups that
// do not exist within the group that is being moved.
d3.select('#' + parent_id).selectAll('.line')[0].forEach(function (el) {
var parent_id = g.attr('id')
var line = d3.select(el)
var nodeType = line.attr('id').split("__"); // id tells us if the line is connected to the left or right node
var operators = line.attr('class').split(" "); // class holds info on what operators the line is connected to
var sourceCircleId = nodeType[0].split("--")[0] + '--' + operators[1];
var targetCircleId = nodeType[1].split("--")[0] + '--' + operators[2];
if (parent_id == operators[1] || parent_id == operators[2]) { // the line is connected to the operator we are moving
line.attr('x1', d3.select('#' + sourceCircleId).attr('cx'))
line.attr('y1', d3.select('#' + sourceCircleId).attr('cy'))
line.attr('x2', d3.select('#' + targetCircleId).attr('cx'))
line.attr('y2', d3.select('#' + targetCircleId).attr('cy'))
}
});
完整的OnDrag代码:
.on('drag', function () {
var g = d3.select(this);
var currentOp = g.select('.operator');
var parent = g.select(function () {
return this.parentNode;
}).select('.qbox');
//#SB: added a reference to the parent id
var parent_id = g.select(function () {
return this.parentNode;
}).attr('id');
//---------------------------------------
var dx = d3.event.x;
var dy = d3.event.y;
var mouse = {dx: d3.event.x, dy: d3.event.y};
var currentObj = {
x: currentOp.attr('x'),
y: currentOp.attr('y'),
width: currentOp.attr('width'),
height: currentOp.attr('height')
};
var parentObj = {
x: parent.attr('x'),
y: parent.attr('y'),
width: parent.attr('width'),
height: parent.attr('height')
};
var loc = getXY(mouse, currentObj, parentObj);
//#SB: Do not translate everything, the cx, cy values of the circle are not updated
// when translating which will make future moves calculate incorrectly
g.selectAll('image').attr('transform', 'translate(' + loc.x + ',' + loc.y + ')');
g.selectAll('circle')
.attr('cx', function () {
return parseFloat(d3.select(this).attr('data-cx')) + parseFloat(loc.x);
})
.attr('cy', function () {
return parseFloat(d3.select(this).attr('data-cy')) + parseFloat(loc.y);
});
//#SB: Select all the lines in the parent group instead of only group of the
// operator we are moving. There can be lines that exists on other groups that
// do not exist within the group that is being moved.
d3.select('#' + parent_id).selectAll('.line')[0].forEach(function (el) {
var parent_id = g.attr('id')
var line = d3.select(el)
var nodeType = line.attr('id').split("__"); // id tells us if the line is connected to the left or right node
var operators = line.attr('class').split(" "); // class holds info on what operators the line is connected to
var sourceCircleId = nodeType[0].split("--")[0] + '--' + operators[1];
var targetCircleId = nodeType[1].split("--")[0] + '--' + operators[2];
if (parent_id == operators[1] || parent_id == operators[2]) { // the line is connected to the operator we are moving
line.attr('x1', d3.select('#' + sourceCircleId).attr('cx'))
line.attr('y1', d3.select('#' + sourceCircleId).attr('cy'))
line.attr('x2', d3.select('#' + targetCircleId).attr('cx'))
line.attr('y2', d3.select('#' + targetCircleId).attr('cy'))
}
});
}))
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