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我是 GEF5 的新手。我正在使用热情/JFace 方法。我可以随意配置节点和边缘(字体、背景颜色、图标、边缘装饰等),但我不知道如何使用图像或颜色设置背景。看来我被白色背景困住了。如何更改绘制节点和边缘的背景属性?标记