graphics2d

I'm writing a simple program to test out basic GUI. The program prints a letter in the middle of the screen and allows the user to move it with the arrow keys. Everything works fine, but when I try to center the letter at the start of the program, it seems that the getWidth and getHeight functions aren't returning the proper numbers. Here's the snippet containing my Panel class static class LinePanel extends JPanel{ int xCenter = getWidth() /2; int yCenter = getHeight() /2; private int x = xCenter; private int y = yCenter; private char keyChar = 'A'; public LinePanel(){ addKeyListener(new

I have a JFrame in my Java application that contains a JPanel where I have some drawing objects created at run-time. The problem is while scrolling the JFrame for large figures the scrolling slows up and scroll bar does not move smoothly. Please note I am using Graphics 2D object and doing repaint on scroll action. Is there any way of smoothing the scrolling action of JFrame . Here is some part of the code public class DiagramPanel implements MouseListener{ int click=0; Point p1; Point p2; private Dimension panelDimension; .... // variables public void go() { p1 = new Point(); p2 = new Point()

As the title says, I'm having a hard time trying to draw some rectangles (filled) in JApplet. The exact goal is to have a 50x50 table and when you click on a targeted cell, to make it filled (possibly done by drawing a filled rectangle). I have done the maths about the coordinates of the starting point, but for some reason I can't draw the new rectangle in the MouseClicked method. Any suggestions? public class Main extends JApplet { public static final int DIMX = 800; public static final int DIMY = 800; public static final int ratio = 16; Graphics g; boolean drawing; public int cX; public int

I'm trying to build a simple paint tool. The mouseDrag events creates a new ellipse and causes my JPanel to repaint() . This works fine so far. However, if I press any button (or any other UI component) before firing the mouseDrag event for the first time, the button is painted in the upper left corner of my panel. I have isolated the code into this test application: import java.awt.BasicStroke; import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing

Here's the function which draws a shape at the given coordinates: public void drawTank(int x,int y){ int h = 50; int w = 50; graphic.setColor(Color.darkGray); graphic.drawRect(x, y, h, w); graphic.fillRect(x, y, h, w); graphic.setColor(Color.GRAY); graphic.drawRect(x+50, y+20, 35, 10); graphic.fillRect(x+50, y+20, 35, 10); } I want to add one more variable to the above function called 'angle', so that the image is also rotated by the angle specified (drawTank(int x,int y,int angle). Updated with example What I tried to do is that I initialized Graphics2D and changed my code respectively: g2D

I am working on a Java project to simulate the flight of a helicopter in a frame. The helicopter moves on the screen using the arrow keys. I want the helicopter to be able to move infinitely, that is, when the helicopter reaches the edge of the frame, the background should move in the opposite direction to have the effect of endless terrain. Here is the code I have so far: import java.awt.Graphics; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.awt.image.BufferedImage; import java.net.URL; import java.io.IOException; import javax.imageio.ImageIO; import javax

I want to rotate a bitmap about its center point , and then draw it into a larger graphics context . The bitmap is 40x40 pixels . The graphics context is 500x500 pixels . This is what I'm doing: BufferedImage bi = new BufferedImage(500, 500, BufferedImage.TYPE_INT_ARGB); Graphics2D g = bi.createGraphics(); AffineTransform at = new AffineTransform(); at.quadrantRotate(1, -20, -20); // rotate 90 degrees around center point. at.translate(100, 40); // I want to put its top-left corner at 100,40. g.drawImage(smallerBitmap, at, null); ... I'm probably using quadrantRotate() incorrectly - if I remove