Java画线段，并把角度画出来

妖狐艹你老母 2024-02-18 21:04 22阅读 0赞

private double getAngleByPoint(float x1, float y1)
    {
        double d = Math.acos(x1/Math.sqrt(x1*x1+y1*y1));
        logger.info(String.format("x: %f, y: %f,d: %f",x1,y1,(float)d));
        return y1>0 ? d : 2*Math.PI-d;
    }
    
    public void draw(Graphics g)
    {
        logger.info("");
        int x0 =  (int)getPointFirst().getX();
        int y0 =  (int)getPointFirst().getY();
        int x1 =  (int)getPointSecond().getX();
        int y1 =  (int)getPointSecond().getY();
        int radius = 50;
    
        double angle = getAngleByPoint(x1-x0,y1-y0);
        angle *=(180/Math.PI);
        System.out.println("angle: "+angle);
        if(angle >= 180)
        {
            g.drawArc(x0 - radius / 2, y0 - radius / 2, radius, radius, 0, (int) (360-angle));
            g.drawString(String.format("%d°", (int)(360-angle)),x0-2,y0-2);
        }
        else
        {
            g.drawArc(x0 - radius / 2, y0 - radius / 2, radius, radius, 0, (int)-angle);
            g.drawString(String.format("%d°", (int)angle),x0-2,y0-2);
        }
    
        g.drawLine(x0,y0,x1,y1);
        g.drawLine(x0,y0,x0+30,y0);
        g.drawString(String.format("(%d,%d)", (int)(getPointFirst().getX()), (int)(getPointFirst().getY())), (int)(getPointFirst().getX()), (int)(getPointFirst().getY())+20);
        g.drawString(String.format("(%d,%d)", (int)(getPointSecond().getX()), (int)(getPointSecond().getY())), (int)(getPointSecond().getX()), (int)(getPointSecond().getY())+20);
    
        //handleSelected(g);
        ArrayList<Point> points = new ArrayList<>();
        points.add(getPointFirst());
        points.add(getPointSecond());
    
        drawOutline(g, points);
    }

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[70]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/eb13cff2cf3340f588a8538b54fb0294.png