java - how to update/ repaint jpanel partially (background stuff is not painted again.it remains there as it is)

Question

We are developing Graphics based application where we need to call repaint method again and again. Now repaint method repaints the whole screen but we want it to repaint only a portion of the Screen keeping reamaining part painted. Is it possible ? if yes then how ?

Answer 1

您可以尝试重载形式的repaint()方法，例如重绘到特定的矩形

Answer 2

我不知道我的理解是否正确，但我首先想到的是覆盖 JPanel 中的 paint() 方法。如果您不清除此方法中的 JPanel，您可以在现有绘图上进行绘制。但是，这种逻辑似乎非常令人厌烦，我宁愿建议使用多个 JPanel 并将它们中的每一个用作大型 JPanel 场景中的实体。这将允许您重新绘制每个实体，然后将它们组合到您想要的场景中。