I am trying to develop an application where users can click on the D3 pie chart and see information which relates to the selection. How can I rotate the arc's so that the clicked arc comes to the bottom (the centre of the arc clicked on should be at the bottom)? I have been playing around with rotating the pie by selecting the arc group but I would appreciate any idea on how to achieve this. Here is some code I have so far.
var self = this;
var instanceId = Math.floor(Math.random() * 100000);
var margin = {
top: 5,
right: 15,
bottom: 50,
left: 20
};
self.width = this.htmlElement.parentElement.parentElement.offsetWidth - margin.right - margin.left;
self.height = window.innerHeight / 3 ;
self.curAngle = 0;
self.svgParent.html("<h4 style='color:green;'>Sponsors </h4><br>");
// Update data for the chart
self.updateChartData = function () {
if(!self.svg) {
this.svg = this.svgParent
.classed("svg-container", true)
.append("svg")
.attr("preserveAspectRatio", "xMinYMin meet")
.attr("viewBox", "0 0 " + this.width + " " + this.height)
.append("g")
.classed("svg-content-responsive", true);
//.attr("transform", "translate(" + this.width / 2 + "," + this.height / 2 + ")");
}
var svgg = this.svg
.append("g")
.classed("svg-content-responsive", true)
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
self.svg.selectAll(".arctext").remove();
self.svg.selectAll(".pie-widget-total-label").remove();
var pie = d3.pie().sort(sort)(self.selectedData.map(function (d: any) {
return d.count;
}));
var path = d3.arc()
.outerRadius(radius)
.innerRadius(radius / 2);
var outsideLabel = d3.arc()
.outerRadius(radius * 0.9)
.innerRadius(radius * 0.9);
var middleLabel = d3.arc()
.outerRadius(radius * 0.75)
.innerRadius(radius * 0.75);
var insideLabel = d3.arc()
.outerRadius(radius * 0.6)
.innerRadius(radius * 0.6);
var g = self.svg
.attr("width", self.width + margin.left + margin.right)
.attr("height", self.height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + self.width / 2 + "," + self.height / 2 + ")");
var defs = g.append("defs");
var lightGradients = defs.selectAll(".arc")
.data(pie)
.enter()
.append("radialGradient")
.attr("id", function (d: any) {
return "lightGradient-" + instanceId + "-" + d.index;
})
.attr("gradientUnits", "userSpaceOnUse")
.attr("cx", "0")
.attr("cy", "0")
.attr("r", "120%");
var darkGradients = defs.selectAll(".arc")
.data(pie)
.enter()
.append("radialGradient")
.attr("id", function (d: any) {
return "darkGradient-" + instanceId + "-" + d.index;
})
.attr("gradientUnits", "userSpaceOnUse")
.attr("cx", "0")
.attr("cy", "0")
.attr("r", "120%");
lightGradients.append("stop")
.attr("offset", "0%")
.attr("style", function (d: any) {
return "stop-color: " + d3.color(color(d.index)) + ";";
});
lightGradients.append("stop")
.attr("offset", "100%")
.attr("style", function (d: any) {
return "stop-color: black;";
});
darkGradients.append("stop")
.attr("offset", "0%")
.attr("style", function (d: any) {
return "stop-color: " + d3.color(color(d.index)).darker(0.5) + ";";
});
darkGradients.append("stop")
.attr("offset", "100%")
.attr("style", function (d: any) {
return "stop-color: black;";
});
self.tooltip = d3.select("body")
.append("div")
.attr("class", "pie-widget-tooltip")
.style("opacity", 0);
self.arc = g.selectAll(".arc")
.data(pie)
.enter()
.append("g")
.attr("class", "arc");
var arcpath = self.arc.append("path")
.attr("id", function (d: any) {
return d.index;
})
.attr("d", path)
.attr("stroke", "white")
.attr("stroke-width", "2px")
.attr("fill", function (d: any) {
return "url(#lightGradient-" + instanceId + "-" + d.index + ")";
})
.on("click", function (d: any) {
console.log("About to send::::" + getStudyLabel(d.index));
self.selectedIndustryTypeService.sendMessage(getStudyLabel(d.index));
self.showDialog();
self.rotateChart();
})
.transition()
.duration(function(d:any, i:any) {
return i * 800;
})
.attrTween('d', function(d:any) {
var i = d3.interpolate(d.startAngle + 0.1, d.endAngle);
return function (t: any) {
d.endAngle = i(t);
return path(d);
}
});
function arcTween(a: any) {
var i = d3.interpolate(this._current, a);
this._current = i(0);
return function(t: any) {
return path(i(t));
};
}
var gtext = self.svg
.append("g")
.attr("transform", "translate(" + self.width / 2 + "," + self.height / 2 + ")");
var arctext = gtext.selectAll(".arctext")
.data(pie)
.enter()
.append("g")
.attr("class", "arctext");
var primaryLabelText = arctext.append("text")
.on("click", function (d: any) {
console.log("About to send::::" + getStudyLabel(d.index));
self.selectedIndustryTypeService.sendMessage(getStudyLabel(d.index));
self.showDialog();
})
.transition()
.duration(750)
.attr("transform", function (d: any) {
return "translate(" + middleLabel.centroid(d) + ")";
})
.attr("dy", "-0.75em")
.attr("font-family", "sans-serif")
.attr("font-size", "15px")
.attr("class", "sponsor-pie-widget-label")
.text(function (d: any) {
if (d.endAngle - d.startAngle < 0.3) {
return "";
} else {
return getStudyLabel(d.index);
}
});
var secondaryLabelText = arctext.append("text")
.on("click", function (d: any) {
console.log("About to send::::" + getStudyLabel(d.index));
self.selectedIndustryTypeService.sendMessage(getStudyLabel(d.index));
self.showDialog();
})
.transition()
.duration(750)
.attr("transform", function (d: any) {
return "translate(" + middleLabel.centroid(d) + ")";
})
.attr("dy", "0.75em")
.attr("font-family", "sans-serif")
.attr("font-size", "10px")
.attr("class", "sponsor-pie-widget-label")
.text(function (d: any) {
if (d.endAngle - d.startAngle < 0.3) {
return "";
} else {
return getPatientsLabel(d.index);
}
});
var n = 0;
for (var i = 0; i < self.selectedData.length; i++) {
n = n + this.selectedData[i]["count"];
}
var total = self.svg
.append("g")
.attr("transform", "translate(" + (self.width / 2 - 20 ) + "," + self.height / 2 + ")")
total.append("text")
.attr("class", "pie-widget-total-label")
.text("Total\r\n" + n);
}.bind(self);
self.showDialog = function() {
this.router.navigateByUrl('/myRouteName');
}.bind(self);
self.rotateChart = function() {
self.arc.attr("transform", "rotate(-45)");
}.bind(self);