A circle

		 Ellipse1 ellipse = new Ellipse1();
		// Set coordinates 
		 ellipse.setBounds(copy);
		 // Turn on background color settings 
		 ellipse.setOpaque(true);
		 // Set background color 
		 ellipse.setBackgroundColor(ColorConstants.white);
		 // Adds a circle to the current figure
		 add(ellipse);

Draw a dividing line

import org.eclipse.cdt.codan.core.model.cfg.IExitNode;
import org.eclipse.draw2d.ColorConstants;
import org.eclipse.draw2d.Ellipse;
import org.eclipse.draw2d.Graphics;
import org.eclipse.draw2d.Polyline;
import org.eclipse.draw2d.geometry.Point;
import org.eclipse.draw2d.geometry.PointList;
import org.eclipse.draw2d.geometry.Rectangle;
/** * @author jg *  Such inheritance draw2d Encapsulated circle drawing class  * 2022 year 4 month 15 Japan  */
public class Ellipse1 extends Ellipse {
    
	@Override
	public void paintFigure(Graphics graphics) {
    
		// TODO Auto-generated method stub
		super.paintFigure(graphics);
		// Get the position of the circle 
		Rectangle copy = getBounds().getCopy();
	
		
		drawScale(graphics,copy);
	    
	
	}


	
	/** *  Rendering content  */
	public void drawScale(Graphics graphics,Rectangle copy) {
    
		
		// reduce 2 Because the circle's parent control border width 
		int x = copy.x-2;
		int y = copy.y-2;
		int width = copy.width;
		int height = copy.height;
		// Center position 
		int circleCenterX= x + (width/2);
		int circleCenterY= y + (height/2);
		
		graphics.setBackgroundColor(ColorConstants.black);
		graphics.fillRoundRectangle(new Rectangle(circleCenterX,circleCenterY,10,10), 100, 100);
		// radius  -15  In order that the dividing line is not on the circle 
		int r = height/2 -15;
		
		SplitObj splitObj = meter.getSplitObj();
		// Line width 
		graphics.setLineWidth(splitObj.getSplitPointWidth());
		ArrayList<Point> coordinate = new ArrayList<>();
		//TextLayout layout = new TextLayout(null);
		
		//  Numerical calculation displayed on the split line 
		// Starting point value 、 Terminal value 、 Number of split lines 、 span  , Such as ：  Starting point value  0、 Terminal value 100、 Number of split lines 41、 span 4
		int interValValue = (100-0)/(40 /4);
		// Display value 
		int num = 0;
		//  Custom scale , Such as ： Display only 45 C to 315 Degree interval  , Point of division 41 individual 
		double angle = 45;
		for (int i = 0; i < 41; i++) {
    
			//  Calculate the radian of each scale 
			//  First calculate the angle 
			if (i == 0) {
    
				//  Fixed start angle 
				angle = 45;

			} else if (i == 40) {
    
				//  Fixed end angle （ It can be set or not ）
				angle = 315;
			} else {
    
				//  Be sure to add a decimal point here , The clock responsible for the calculation result gets an integer ,41 A scale represents the need for 40 Bisection angle 
				angle += ((315.0 - 45.0) / 40.0);
			}

			double radian = angle * (Math.PI / 180);
			// Set the property of large split point , They are span , Line width 、 Thread length 、 Color   Such as ：  span  4 、 Line width 4、 Thread length 15 、 Color 0x0
			
			int len = 10;
			if (i  % 4 ==0) {
    
				// Line width 
				graphics.setLineWidth(4);
				
				//  The line length of the split point is 
				 len = 15;
			   //  Large split point position setting value 
// graphics.drawLine( circleCenterX + (int) (Math.cos(radian) * (r-20)),
// circleCenterY + (int) (Math.sin(radian) * (r-20)), 
// circleCenterX + (int) (Math.cos(radian) * (r - 25)),
// circleCenterY + (int) (Math.sin(radian) * (r - 25)));
// graphics.drawRectangle( circleCenterX + (int) (Math.cos(radian) * (r-15)),
// circleCenterY + (int) (Math.sin(radian) * (r-15)) 
// ,40,30);
				
				
				 // When the angle is 0 To 180 Between   Put the coordinates up 15 spot 
				 if (0.0 < angle && angle< 180.0) {
    
					graphics.drawString(""+num, circleCenterX + (int) (Math.cos(radian) * (r -len-10)),
							circleCenterY + (int) (Math.sin(radian) * (r -len-30)));
// layout.setText(""+num);
// graphics.drawTextLayout(layout, circleCenterX + (int) (Math.cos(radian) * (r -len-10)),
// circleCenterY + (int) (Math.sin(radian) * (r -len-10)),
// 0, -1, ColorConstants.red,
// ColorConstants.black);
				}else {
    
					graphics.drawString(""+num,circleCenterX + (int) (Math.cos(radian) * (r - len-5)),
							circleCenterY + (int) (Math.sin(radian) * (r - len-5))	
							);
				}
			// Add radians  
			// Judge the starting point value 
			if (num  == 0 ) {
    
				graphics.setForegroundColor(Converter.Int2Color(Converter.Hex2Int("#ff0000")));
				// Add radians 
				/*for (int i = 0; i < coordinate.size(); i+=2) { graphics.drawLine(coordinate.get(i), coordinate.get(i+1)); }*/
				// Inner circle 
				Rectangle rectangle = new Rectangle();
				//15 According to the above  int r = height/2 -15;  have to 
				rectangle.x = x + 15;
				rectangle.y = y + 15;
				//30 Subtract... From both sides of the middle circle 15 have to 
				rectangle.width =width -30;
				rectangle.height =height-30;
				// 0 Starting angle ,90 Arc length 
				//graphics.drawArc(rectangle, 0, 90);
				// Note that the angle here is from 3 PM , Increase the angle counterclockwise , So everything is reversed 
				graphics.drawArc(rectangle, (int)(360-angle), -(270/10*4));
			}else if (num  == 80) {
    
				graphics.setForegroundColor(Converter.Int2Color(Converter.Hex2Int("#0000ff")));
				// Inner circle 
				Rectangle rectangle = new Rectangle();
				//15 According to the above  int r = height/2 -15;  have to 
				rectangle.x = x + 15;
				rectangle.y = y + 15;
				//30 Subtract... From both sides of the middle circle 15 have to 
				rectangle.width =width -30;
				rectangle.height =height-30;
				// 0 Starting angle ,90 Arc length 
				//graphics.drawArc(rectangle, 0, 90);
				// Note that the angle here is from 3 PM , Increase the angle counterclockwise  
				graphics.drawArc(rectangle, (int)(360-angle), -(270/10*2));
			}
			
			//  Color  0xaaaaaa
			graphics.setForegroundColor(Converter.Int2Color(0));
			num += interValValue; 
			}else {
    
				// Line width 
				graphics.setLineWidth(2);
				//  Color  0xaaaaaa
				graphics.setForegroundColor(Converter.Int2Color(Converter.Hex2Int("#aaaaaa")));
				//  The line length of the split point is 
				 len = 10;
				
				
			}
			//  Be careful ： Here I am with 3 Point as the starting point , The angle increases clockwise 
			graphics.drawLine(circleCenterX + (int) (Math.cos(radian) * r),
					circleCenterY + (int) (Math.sin(radian) * r),
					circleCenterX + (int) (Math.cos(radian) * (r - len)),
					circleCenterY + (int) (Math.sin(radian) * (r - len))
					);
			
			
		}

	}
	
	
	}

effect ：（ There's another pointer that hasn't been drawn ）