画圆

		 Ellipse1 ellipse = new Ellipse1();
		//设置坐标
		 ellipse.setBounds(copy);
		 //打开背景色设置
		 ellipse.setOpaque(true);
		 //设置背景色
		 ellipse.setBackgroundColor(ColorConstants.white);
		 //将圆添加到当前figure
		 add(ellipse);

画分割线

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 * 此类继承draw2d封装好的画圆的类 * 2022年4月15日 */
public class Ellipse1 extends Ellipse {
    
	@Override
	public void paintFigure(Graphics graphics) {
    
		// TODO Auto-generated method stub
		super.paintFigure(graphics);
		//得到圆的位置
		Rectangle copy = getBounds().getCopy();
	
		
		drawScale(graphics,copy);
	    
	
	}


	
	/** * 渲染内容 */
	public void drawScale(Graphics graphics,Rectangle copy) {
    
		
		//减2是因为圆的父控件边框宽度
		int x = copy.x-2;
		int y = copy.y-2;
		int width = copy.width;
		int height = copy.height;
		//圆心位置
		int circleCenterX= x + (width/2);
		int circleCenterY= y + (height/2);
		
		graphics.setBackgroundColor(ColorConstants.black);
		graphics.fillRoundRectangle(new Rectangle(circleCenterX,circleCenterY,10,10), 100, 100);
		//半径 -15 为了分割线不在圆上
		int r = height/2 -15;
		
		SplitObj splitObj = meter.getSplitObj();
		//线宽
		graphics.setLineWidth(splitObj.getSplitPointWidth());
		ArrayList<Point> coordinate = new ArrayList<>();
		//TextLayout layout = new TextLayout(null);
		
		// 分割线上显示的数值计算
		//起点值、终点值、分割线数量、跨度 ，如： 起点值 0、终点值100、分割线数量41、跨度4
		int interValValue = (100-0)/(40 /4);
		//显示值
		int num = 0;
		// 自定义刻度，如：只显示45度到315度区间 ，分割点41个
		double angle = 45;
		for (int i = 0; i < 41; i++) {
    
			// 计算每个刻度的弧度
			// 先计算角度
			if (i == 0) {
    
				// 固定起点角度
				angle = 45;

			} else if (i == 40) {
    
				// 固定终点角度（可以设置也可以不设置）
				angle = 315;
			} else {
    
				// 此处一定要加小数点，负责运算结果时钟得到的是整数，41个刻度代表需要40等分角度
				angle += ((315.0 - 45.0) / 40.0);
			}

			double radian = angle * (Math.PI / 180);
			//设置大分割点属性，分别是跨度，线宽、线长、颜色 如： 跨度 4 、线宽4、线长15 、颜色0x0
			
			int len = 10;
			if (i  % 4 ==0) {
    
				//线宽
				graphics.setLineWidth(4);
				
				// 分割点线长
				 len = 15;
			   // 大分割点位置设置数值
// 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);
				
				
				 //当角度在0到180之间 将坐标往上15点
				 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))	
							);
				}
			//添加弧度 
			//判断开始点数值
			if (num  == 0 ) {
    
				graphics.setForegroundColor(Converter.Int2Color(Converter.Hex2Int("#ff0000")));
				//添加弧度
				/*for (int i = 0; i < coordinate.size(); i+=2) { graphics.drawLine(coordinate.get(i), coordinate.get(i+1)); }*/
				//内圈圆
				Rectangle rectangle = new Rectangle();
				//15根据上面 int r = height/2 -15; 得
				rectangle.x = x + 15;
				rectangle.y = y + 15;
				//30为中间圆两边减15得
				rectangle.width =width -30;
				rectangle.height =height-30;
				// 0起始角度，90弧长
				//graphics.drawArc(rectangle, 0, 90);
				//注意此处的角度是从3点开始，逆时针增加角度,所以一切取反
				graphics.drawArc(rectangle, (int)(360-angle), -(270/10*4));
			}else if (num  == 80) {
    
				graphics.setForegroundColor(Converter.Int2Color(Converter.Hex2Int("#0000ff")));
				//内圈圆
				Rectangle rectangle = new Rectangle();
				//15根据上面 int r = height/2 -15; 得
				rectangle.x = x + 15;
				rectangle.y = y + 15;
				//30为中间圆两边减15得
				rectangle.width =width -30;
				rectangle.height =height-30;
				// 0起始角度，90弧长
				//graphics.drawArc(rectangle, 0, 90);
				//注意此处的角度是从3点开始，逆时针增加角度 
				graphics.drawArc(rectangle, (int)(360-angle), -(270/10*2));
			}
			
			// 颜色 0xaaaaaa
			graphics.setForegroundColor(Converter.Int2Color(0));
			num += interValValue; 
			}else {
    
				//线宽
				graphics.setLineWidth(2);
				// 颜色 0xaaaaaa
				graphics.setForegroundColor(Converter.Int2Color(Converter.Hex2Int("#aaaaaa")));
				// 分割点线长
				 len = 10;
				
				
			}
			// 注意：此处我是以3点为起点，角度顺时针增加
			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))
					);
			
			
		}

	}
	
	
	}

效果：（还有一个指针没有画）