java - 饼图未显示预期输出

Question

我试图使我的饼图与模拟器运行期间更改的数据保持同步。

我的问题是饼图没有以正确的方式显示数据，我不知道问题是什么。

 public void paintComponent(Graphics g) {
        super.paintComponent(g); 

        int totalAmountOfCars = this.adhocCars + this.reservationCars + this.parkpassCars;
        float percentageAdHoc = totalAmountOfCars <= 0 || this.adhocCars <= 0 ? 0 : adhocCars/totalAmountOfCars * 100;
        float percentageParkPass = totalAmountOfCars <= 0 || this.parkpassCars <= 0 ? 0 :parkpassCars/totalAmountOfCars * 100;
        float percentageReservation = totalAmountOfCars <= 0 || this.reservationCars <= 0 ? 0 :reservationCars/totalAmountOfCars * 100;


        float adHocAngle = totalAmountOfCars <= 0 || this.adhocCars <= 0 ? 0 : 360/percentageAdHoc*100;
        float parkPassAngle = totalAmountOfCars <= 0 || this.parkpassCars <= 0 ? 0 : 360/percentageParkPass*100;
        float reservationAngle = totalAmountOfCars <= 0 || this.reservationCars <= 0 ? 0 : 360/percentageReservation*100;

        Dimension prefSize = this.getPreferredSize();
        g.setColor(Color.WHITE);
        g.fillRect(prefSize.width/2, prefSize.height/2, 200, 200);

这里我计算弧的角度..

g.setColor(Color.RED);
g.fillArc(prefSize.width/2 + 10, prefSize.height/2 + 10, 180, 180, 0,(int)adHocAngle);
g.setColor(Color.BLUE);
g.fillArc(prefSize.width/2 + 10, prefSize.height/2 + 10, 180, 180, (int)adHocAngle, (int)adHocAngle+(int)parkPassAngle);
g.setColor(Color.ORANGE);
g.fillArc(prefSize.width/2 + 10, prefSize.height/2 + 10, 180, 180,(int)adHocAngle+(int)parkPassAngle, (int)reservationAngle);

这部分应该填充它，在某些情况下，整个字符填充为橙色，而在其他情况下，它为 99% 红色，并带有一条细小的蓝色线。而不是例如 30%、40%、30%。

黄色图表:

红/蓝图表:

Answer 1

也许您想首先确保百分比计算正确。

adhocCars/totalAmountOfCars * 100;

应该是

100/totalAmountOfCars * adhocCars;