Javascript D3使用滚动条进行缩放,滚动条的宽度和高度可根据缩放比例进行调整
我要创建以下内容:Javascript D3使用滚动条进行缩放,滚动条的宽度和高度可根据缩放比例进行调整,javascript,d3.js,Javascript,D3.js,我要创建以下内容: 制作一个动态图表 它是可缩放的(在当前显示的中心进行缩放)(单击某些按钮时进行缩放,禁用鼠标滚轮进行缩放) 元素是可拖动的(拖动时不受力图排列的影响)(当元素拖动到svg外部时,svg的大小会增加) 它使用滚动条作为平移 到目前为止,我已经取得了成功 创建力图 创建缩放 图元已可拖动,且在拖动后不包含在力中 滚动条也 我对这些组合项目有两个问题: 通过拖动元素,它不再包含在力图中。如果有新的元素,可能会导致其他元素的重叠 带有缩放功能的滚动条并没有发挥神奇的作用,当您缩放->
function drawGraph(Data){
setDefault();
svg = d3.select("#graphingArea").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.call(zoom)
.on("dblclick.zoom", false)
.on("mousewheel.zoom", false)
.on("DOMMouseScroll.zoom", false) // disables older versions of Firefox
.on("wheel.zoom", false); // disables newer versions of Firefox;
//Needed for canvas to be dragged
rect = svg.append("rect")
.attr("width", width)
.attr("height", height)
.style("fill", "none")
.style("pointer-events", "all");
//Holds all that is to be dragged by the canvas
container = svg.append("g");
//Call zoom before drawing
svg.call(zoomUpdate);
//FOR DRAG
var drag = d3.behavior.drag()
.origin(function(d) { return d; })
.on("dragstart", dragstarted)
.on("drag", dragged)
.on("dragend", dragended);
//Creating data that is drawn
populateD3Data(container, drag);
// Set data to be Force Arranged
force = self.force = d3.layout.force()
.nodes(nodes)
.links(links)
.distance(150)
.charge(-1000)
.size([width,height])
.start();
//Event to call arrange
force.on("tick", tick);
}
缩放js:
var zoom = d3.behavior.zoom()
.scaleExtent([zoom_min_scale, zoom_max_scale])
.on("zoom", zoomed);
function zoomed() {
if(container != null && container != undefined) {
var translate = zoom.translate(),
scale = zoom.scale();
tx = Math.min(0, Math.max(width * (1 - scale), translate[0]));
ty = Math.min(0, Math.max(height * (1 - scale), translate[1]));
zoom.translate([tx, ty]);
container.attr("transform", "translate(" + [0,0] + ")scale(" + zoom.scale() + ")");
svg.attr("width", AreaWidth_ * zoom.scale());
svg.attr("height", AreaHeight_ * zoom.scale());
$("#graphingArea").scrollLeft(Math.abs(zoom.translate()[0]));
$("#graphingArea").scrollTop(Math.abs(zoom.translate()[1]));
}
}
//Button event for zoom in
d3.select("#zoom_in")
.on("click", zoomInOrOut);
//Button event for zoom out
d3.select("#zoom_out")
.on("click", zoomInOrOut);
//Gets the center of currently seen display
function interpolateZoom (translate, scale) {
return d3.transition().duration(1).tween("zoom", function () {
var iTranslate = d3.interpolate(zoom.translate(), translate),
iScale = d3.interpolate(zoom.scale(), scale);
return function (t) {
zoom
//Round number to nearest int because expected scale for now is whole number
.scale(Math.floor(iScale(t)))
.translate(iTranslate(t));
zoomed();
};
});
}
function zoomInOrOut() {
var direction = 1,
target_zoom = 1,
center = [graph_area_width / 2, graph_area_height / 2],
extent = zoom.scaleExtent(),
translate = zoom.translate(),
translate0 = [],
l = [],
view = {x: translate[0], y: translate[1], k: zoom.scale()};
d3.event.preventDefault();
direction = (this.id === 'zoom_in') ? 1 : -1;
target_zoom = zoom.scale() + (direction * zoom_scale);
if (target_zoom < extent[0] || target_zoom > extent[1]) { return false; }
translate0 = [(center[0] - view.x) / view.k, (center[1] - view.y) / view.k];
view.k = target_zoom;
l = [translate0[0] * view.k + view.x, translate0[1] * view.k + view.y];
view.x += center[0] - l[0];
view.y += center[1] - l[1];
interpolateZoom([view.x, view.y], view.k);
}
function zoomUpdate() {
var target_zoom = 1,
center = [graph_area_width / 2, graph_area_height / 2],
extent = zoom.scaleExtent(),
translate = zoom.translate(),
translate0 = [],
l = [],
view = {x: translate[0], y: translate[1], k: zoom.scale()};
target_zoom = zoom.scale();
if (target_zoom < extent[0] || target_zoom > extent[1]) { return false; }
translate0 = [(center[0] - view.x) / view.k, (center[1] - view.y) / view.k];
view.k = target_zoom;
l = [translate0[0] * view.k + view.x, translate0[1] * view.k + view.y];
view.x += center[0] - l[0];
view.y += center[1] - l[1];
interpolateZoom([view.x, view.y], view.k);
}
var zoom=d3.behavior.zoom()
.scaleExtent([zoom\u min\u scale,zoom\u max\u scale])
。打开(“缩放”,缩放);
函数缩放(){
if(container!=null&&container!=未定义){
var translate=zoom.translate(),
scale=zoom.scale();
tx=数学最小值(0,数学最大值(宽度*(1-刻度),平移[0]);
ty=Math.min(0,Math.max(高度*(1-刻度),平移[1]);
缩放。平移([tx,ty]);
container.attr(“transform”、“translate”(++[0,0]+”)比例(“+zoom.scale()+”));
attr(“width”,AreaWidth_*zoom.scale());
attr(“height”,AreaHeight_*zoom.scale());
$(“#graphingArea”).scrollLeft(Math.abs(zoom.translate()[0]);
$(“#graphingArea”).scrollTop(Math.abs(zoom.translate()[1]);
}
}
//放大按钮事件
d3.选择(“放大”)
。打开(“单击”,zoomInOrOut);
//用于缩小的按钮事件
d3.选择(“缩小”)
。打开(“单击”,zoomInOrOut);
//获取当前显示的中心
函数插值空间(平移、缩放){
返回d3.transition().duration(1.tween(“缩放”),函数(){
var iTranslate=d3.interpolate(zoom.translate(),translate),
iScale=d3.插值(zoom.scale(),scale);
返回函数(t){
快速移动
//将数字舍入为最接近的整数,因为目前预期的小数位数为整数
.比例(数学楼层(iScale(t)))
.翻译(iTranslate(t));
缩放();
};
});
}
函数zoomInOrOut(){
var方向=1,
目标缩放=1,
中心=[图形面积宽度/2,图形面积高度/2],
extent=zoom.scaleExtent(),
translate=zoom.translate(),
translate0=[],
l=[],
视图={x:translate[0],y:translate[1],k:zoom.scale()};
d3.event.preventDefault();
方向=(this.id=='zoom_in')?1:-1;
target_zoom=zoom.scale()+(方向*缩放比例);
if(target_zoomextent[1]){return false;}
translate0=[(中间[0]-view.x)/view.k,(中间[1]-view.y)/view.k];
view.k=目标\缩放;
l=[translate0[0]*view.k+view.x,translate0[1]*view.k+view.y];
视图x+=中心[0]-l[0];
视图y+=中心[1]-l[1];
插值空间([view.x,view.y],view.k);
}
函数zoomUpdate(){
var target_zoom=1,
中心=[图形面积宽度/2,图形面积高度/2],
extent=zoom.scaleExtent(),
translate=zoom.translate(),
translate0=[],
l=[],
视图={x:translate[0],y:translate[1],k:zoom.scale()};
target_zoom=zoom.scale();
if(target_zoomextent[1]){return false;}
translate0=[(中间[0]-view.x)/view.k,(中间[1]-view.y)/view.k];
view.k=目标\缩放;
l=[translate0[0]*view.k+view.x,translate0[1]*view.k+view.y];
视图x+=中心[0]-l[0];
视图y+=中心[1]-l[1];
插值空间([view.x,view.y],view.k);
}
以下是我对d3缩放与滚动条相结合的看法:
除了处理d3的缩放以更新滚动条位置外,您还需要通过调用
translateTo()
来处理滚动条以更新d3的内部缩放表示,您是否得到了答案?因为我也在尝试实现带有缩放的滚动条。