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append a circle in middle of all my path (sunburst)


append a circle in middle of all my path (sunburst)

By : MRB
Date : November 22 2020, 11:17 AM
it should still fix some issue This is in part a repeat of Lars' equations from the comments, but I thought it was worth recapping all at once because the trig identities for converting from angles to x/y coordinates won't match your trig text book.
Most text books assume that angles start at the right horizontal axis and increase counter-clockwise, and that the vertical axis has larger values higher up on the page.
code :
  g.append("circle") //circles inherit pie chart data from the <g>
      .attr("r", 5) 
      .attr("cx", function(d) { 
          return Math.sin((d.startAngle + d.endAngle)/2) *radius;
      })
      .attr("cy", function(d) { 
          return -Math.cos((d.startAngle + d.endAngle)/2) *radius;
      });


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Inserting map overlays on circle path according to some point in the middle

Inserting map overlays on circle path according to some point in the middle


By : William J. Hale II
Date : March 29 2020, 07:55 AM
To fix the issue you can do Let's say I have a point like lat:41.01522 and lon:28.95221. I need to calculate X latx and lonx so that these points create a circle (evenly distrubuted) around this point with a given radius. , This is how I'm doing it:
code :
@Override
public void draw(Canvas canvas, MapView mapview, boolean shadow) {
    super.draw(canvas, mapview, shadow);

        if(location != null){
            //---translate the GeoPoint with center to screen pixels---
            screenPts = new Point();
            mapview.getProjection().toPixels(new GeoPoint((int)(location.getLatitude()*1E6),(int)(location.getLongitude()*1E6)) , screenPts);


            //Draw accuracy marker
            GeoPoint g0 = mapview.getProjection().fromPixels(0, screenPts.y);
            GeoPoint g1 = mapview.getProjection().fromPixels(width, screenPts.y);
            l0.setLatitude(g0.getLatitudeE6()/1E6);
            l0.setLongitude(g0.getLongitudeE6()/1E6);
            l1.setLatitude(g1.getLatitudeE6()/1E6);
            l1.setLongitude(g1.getLongitudeE6()/1E6);
            float d01=l0.distanceTo(l1);
            int size=(int)(location.getAccuracy() * width / d01);
            canvas.drawCircle(screenPts.x, screenPts.y, size, paintAccuracyFill);
            canvas.drawCircle(screenPts.x, screenPts.y, size, paintAccuracyStroke);
        }
}
How do i draw a circle in the middle of a Form and how do i find the circle center?

How do i draw a circle in the middle of a Form and how do i find the circle center?


By : Shruthi S Jarali
Date : March 29 2020, 07:55 AM
Hope that helps the properties this.Width and this.Height are the same as this.Bounds which describes itself as:
code :
public partial class Form1 : Form
{
    int circleDiameter  = 100;

    public Form1()
    {
        InitializeComponent();
    }

     private void Form1_Paint(object sender, PaintEventArgs e)
    {

        Point CenterPoint = new Point()
        {
            X = this.ClientRectangle.Width/2,
            Y = this.ClientRectangle.Height/2
        };
        Point topLeft = new Point()
        {
            X=(this.ClientRectangle.Width - circleDiameter) / 2,
            Y=(this.ClientRectangle.Height - circleDiameter) / 2
        };
        Point topRight = new Point()
        {
            X=(this.ClientRectangle.Width + circleDiameter) / 2,
            Y=(this.ClientRectangle.Height - circleDiameter) / 2
        };
        Point bottomLeft = new Point()
        {
            X=(this.ClientRectangle.Width - circleDiameter) / 2,
            Y=(this.ClientRectangle.Height + circleDiameter) / 2
        };
        Point bottomRight = new Point()
        {
            X=(this.ClientRectangle.Width + circleDiameter) / 2,
            Y=(this.ClientRectangle.Height + circleDiameter) / 2
        };

         e.Graphics.DrawRectangle(Pens.Red, topLeft.X, topLeft.Y, circleDiameter, circleDiameter);
         e.Graphics.DrawLine(Pens.Red, CenterPoint, topLeft);
         e.Graphics.DrawLine(Pens.Red, CenterPoint, topRight);
         e.Graphics.DrawLine(Pens.Red, CenterPoint, bottomLeft);
         e.Graphics.DrawLine(Pens.Red, CenterPoint, bottomRight);
    }

    private void Form1_Resize(object sender, EventArgs e)
    {
        this.Invalidate();
    }

}
How can I add a background circle to a sunburst plot?

How can I add a background circle to a sunburst plot?


By : G.f
Date : March 29 2020, 07:55 AM
this will help All you need to do is append a circle to the SVG as the first thing after creating it:
code :
svg.append("circle").attr("r", radius).style("fill", "pink");
Adding labels to the middle of a sunburst on mouseover

Adding labels to the middle of a sunburst on mouseover


By : user3614684
Date : March 29 2020, 07:55 AM
this will help This problem is solved by first of all appending text elements to a g element and not svg element. Second you want to create a text element outside the mousehandler with a specific id then call it using that Id within the event handler like so.
code :
d3.json("flare.json", function(error, root) {
var g = svg.selectAll("g")
  .data(partition.nodes(root))
.enter().append("g");

var path = 
        g.append("path")
        .attr("display", function(d) { return d.depth ? null : 'none';}) //hide inner ring 
        .attr("d", arc)//used whenever I come across a path 
        .attr("id", "part")
        .style("stroke", "#fff")
        .style("fill", function(d) { return color((d.children ? d : d.parent).name);})
        .style("fill-rule", "evenodd")
        .each(stash)
        .on("mouseover", mouseover)
        .on("mouseout", mouseout);

var text = g.selectAll("text")
            .data(partition.nodes(root))
            .enter()
            .append("text")
            .attr("id", "tip")
            .attr("x", 10)
            .attr("y", 50)
            .attr("font-size", "11px")
            .style("opacity", 0);


function mouseover(d) {

  d3.select(this)
        .transition()
        .duration(1000)
        .ease('elastic')
        .style("opacity", 0.3);

//label.style("opacity", .9);
d3.select("#tip").text(d.name).style("opacity", 0.9);

console.log('mouseover', mouseover);    
};

function mouseout(d) {
d3.select(this)
        .transition()
        .duration(100)
        .style("opacity", 1);

d3.select("#tip").text(d.name).style("opacity", 0);

console.log('mouseout', mouseout);  
  };
How can I change the size of the innermost circle in a D3 zoomable sunburst?

How can I change the size of the innermost circle in a D3 zoomable sunburst?


By : Chalupacabra
Date : March 29 2020, 07:55 AM
I wish this helpful for you Please find this edited example in plunker here: https://plnkr.co/edit/9iDdZ2auIJQokr1Yb9il?p=preview
I have added this variable innerCircleScale that you can edit to change the size of the inner circle. Initially it was 20. I find 100 to be ideal here.
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