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I would like to add one simple arc in the chart section like a circle:
vis.append("circle")
.style("stroke", "gray")
.style("fill", "white")
.attr("r", 40)
.attr("cx", 50)
.attr("cy", 50);
The provided examples of D3 are working with data properties but i would like to see it without any underlying data.
478
arc() returns a generator that when called automatically generates and returns a string of characters that can be assigned to the d attribute of a path element to define an arc, circle, or annulus. To create an arc generator simply call d3. arc() . var arcGen = d3.
var circle = d3. selectAll("circle"); With a selection, we can make various changes to selected elements.
In a pie chart, the arc length of each slice (and consequently its central angle and area) is proportional to the quantity it represents. While it is named for its resemblance to a pie which has been sliced, there are variations on the way it can be presented.
D3 uses a path generator for arcs. If you don't want to data-drive your arc just define the arc generator and add some methods...
var arc = d3.svg.arc()
.innerRadius(50)
.outerRadius(70)
.startAngle(45 * (Math.PI/180)) //convert from degs to radians
.endAngle(3) //just radians
vis.append("path")
.attr("d", arc)
.attr("transform", "translate(50,50)")
You can see a demo here: http://jsfiddle.net/h9XNz/
134
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