awt

I am trying to create colored headers and footers when printing a JTable. Specifically, I am looking at getPrintable() in javax.swing.JTable, but MessageFormat does not give me the option to specify the color of the header or footer. How can I do it? clarification I am interested in setting the header/footers while printing. For example, notepad appends the filename as a header to what you print. update Seems like there is no standard way of doing this, can someone give me some workarounds? The only answer posted so far has nothing to do with printing(as in send to a printer, not displaying to

最近工作需要在登录时使用滑动验证码验证。 网上能查到的做法基本上都是使用一张已存在的实际图片作为滑块的图形模板，然后按照此模板做二重循环逐像素地从源图像抠出滑块以及新图。 这种方式优点就是可以控制每个像素，如改变局部的 Alpha 值、做局部的高斯模糊等。缺点也显而易见——太麻烦，且二重循环对内存也是不小的负担。 笔者的想法是：首先生成滑块 1）根据规定好的路径生成闭合区间；2）设置 Graphics2D 的渲染区间（ setClip 方法）；3）使用原图来渲染当前 Image（ drawImage 方法）。最后在源图扣掉滑块的地方加上阴影。 研究了一下 Java 的 awt 图像处理，这里对这几天的成果做一个记录，本文仅涉及图像处理方面，去掉了其它业务逻辑。 生成闭合区间 Java awt中提供了 Shape 接口，来代表任意一种几何图形。考虑我们要实现如下滑块图形： 上图左边的滑块可以先简化为右侧，原理是一样的。右边的图像一共有A、B、C、D、E、F六个定点。其中CD之间是一段圆弧。Graphics2D的坐标系从左上角开始，x轴往下是正方向，y轴往右是正方向。先算出每个点坐标：A(0,0)、B(0,50)、C(15,50)、D(35,50)、E(50,50)、F(50,0)。 注意到H1'和H2'两个点，CD间的圆弧由三阶贝塞尔曲线表示，H1'和H2'就是此贝塞尔曲线的控制点

My basic bouncing ball Applet should have a ball moving around according to the values in loc variable, but nothing shows up. Printing out loc shows that the numbers/math behind moving it around and bouncing off boundaries is indeed working as it should, but nothing shows up. Looking at examples online I didn't see why my drawing/painting code wasn't working as intended. Here's what I have, issues are probably focused about halfway down where the Ball object is. I posted most of the program as it does compile/run if someone will run it. import java.awt.*; import java.applet.*; import java.awt

I'm stuck with a problem considering my Display class, which extends Canvas. A single thread is running within the very same class. In this thread, the repaint method is called. However, while the thread works fine, the paint method is never called! Here's my code (I left out everything unrelated): package display; public final class Display extends Canvas implements Runnable { private static final long serialVersionUID = 1L; private Frame frame; private GraphicsEnvironment ge; private GraphicsDevice gd; public BDisplay() { ge = GraphicsEnvironment.getLocalGraphicsEnvironment(); gd = ge

I have a generated post script file and want to print using it. How can it be achieved in java either using javax print API or AWT. Is it possible? Complicated. Does your printer(s) support PostScript? Is it networked? If so, most networked printers can talk LPR and you can shove the file over as-is. On Windows, you could also stream the file as-is to the lpt1: mapped port via something like NET USE LPT1: \\[Computer Name]\Printer /PERSISTENT:YES . If you're on a server and you do lots of PostScript handling and your printer infrastructure supports it, I would very much look into the LPR