graphics2d

I am trying to draw a line using the Graphics 2D but then the line appears over all the other components in the JFrame thus making them invisible. How do I correct this problem? Here's the code : import javax.swing.*; import java.awt.*; import java.awt.geom.*; class Success extends JFrame{ public Success(){ JPanel panel=new JPanel(); getContentPane().add(panel); setSize(450,450); JButton button =new JButton("press"); panel.add(button); } public void paint(Graphics g) { Graphics2D g2 = (Graphics2D) g; Line2D lin = new Line2D.Float(100, 100, 250, 260); g2.draw(lin); } public static void main

Im working on a paint application written in java and running into a few (more) problems. I have a gui and a working program(kinda), my only problem is that the lines and graphics that the user draws are not saved(disappear after next one is drawn). From a past question i learned that i will need to use a BufferedImage to store the drawings then paint that inside my paint class. My questions are, Can anyone provide a basic explanation/example of how to use a bufferedimage to store and paint the drawing and if i need to, how will i pass the color and thickness of the drawn line into a stored

I want to draw a PARTIALLY transparent image on top of another (Making shadows over things). I am currently using java's Graphics2D class to render, I've been told to set the composite to AlphaComposite, but that only sets it completely transparent. Can I do this with my current setup? What do I have to do to fix this? This is the code I was told that would make it partially transparent: AlphaComposite ac = java.awt.AlphaComposite.getInstance(AlphaComposite.CLEAR, 0.5F); g.setComposite(ac); (I am using png images by the way) Heres your sscce (these are all in different classes but i put them

I have a set of points on a plane. They are partitioned into subsets. I want to plot a closed curve around points that belong to the same subset, so that points that belong to a subset will be inside the curve, and those that aren't will be outside. Therefore simple circles, or a convex hull might not work. For a starter, let's say I just want to have a smooth curve around a set of point (without the requirement that it excludes other points) Any ideas how to do that in R? ---added later--- What I'm looking eventually, is something in the spirit of the graphics in here: https://tex

I'm trying to draw Images with Graphics2D on JFrame. But this code only displays blank background. How to do that? Java Version: SE-1.6 IDE: Eclipse My code looks like this: import java.awt.BasicStroke; import java.awt.Color; import java.awt.Graphics2D; import java.awt.image.BufferStrategy; import java.awt.geom.Line2D; import java.util.TimerTask; import javax.swing.JFrame; public class GraphicTest extends JFrame{ public static void main(String[] args) { GraphicTest gt = new GraphicTest(); gt.start(); } JFrame frame; BufferStrategy strategy; GraphicTest(){ int width = 320; int height = 240;