我的程序有問題。我試圖在火車上移動火車,這些火車以橢圓形表示。當我嘗試移動這些物體時,它們被繪製在新的位置,但它們也被繪製在之前的位置。JAVA2D - 移動的對象都處於第一個和移動的位置
trensPretos是TREM類的鏈表:
'公共鏈表trensPretos =新鏈表();'
這裏是我的代碼:
public void AtualizaTrensPretos()
{
int currentX;
int currentY;
// trens pretos se movem
for (Trem t:trensPretos)
{
while(t.get_x() < 1100)
{
currentX = t.get_x();
currentY = t.get_y();
t.setNew_x(currentX + moveX);
// antes da linha reta
if (t.get_x() < 270)
{
t.setNew_y(currentY + moveY);
}
else if(t.get_x() > 730)
{// depois da linha reta
t.setNew_y(currentY - (moveY+1));
}
setChanged();
notifyObservers(t);
}
// removo o trem após ele passar pelo cruzamento
// trensPretos.remove(t);
}
}
// Observer
// recebo trem e desenho
g2d = (Graphics2D) this.getGraphics();
if (arg instanceof Trem)
{
if (g2d != null)
{
g2d.setColor(((Trem) arg).getColor());
g2d.fill(((Trem) arg).getEllipse());
}
}
//珍珍類
公共類珍珍{
private int posX;
private int posY;
private Color corTrem;
private Ellipse2D formaDoTrem;
private int sizeX = 30;
private int sizeY = 30;
public Trem(Color corDoTrem)
{
formaDoTrem = new Ellipse2D.Double();
this.corTrem = corDoTrem;
}
public Color getColor()
{
return this.corTrem;
}
public void setNew_x(int x)
{
this.posX = x;
}
public void setNew_y(int y)
{
this.posY = y;
}
public int get_x()
{
return this.posX;
}
public int get_y()
{
return this.posY;
}
public Ellipse2D getEllipse()
{
this.formaDoTrem.setFrame(posX, posY, sizeX, sizeY);
return this.formaDoTrem;
}
}
可能是什麼問題呢?
您提供的詳細信息不足以找到問題 – Ashish
我改變位置,然後嘗試再次繪製它... – user2928858
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