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PODynamic Graphics Object Painting
 

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    <p>Trying to figure out the best way to do this (And without crossing any specifics DO NOTs that I don't know about).</p> <p>I'm working on visually displaying a graph (Various nodes, with edges connecting them) with circles and lines to represent such. Each node will be added during runtime and I can't hardcode this. From what I understand, all painting needs to be done in the paint(Graphics g) method - which isn't that helpful, since I can't be change the parameters and it seems this is only called during the initial creation?</p> <p>Right now I was thinking about having it call various other methods, passing the Graphics object, and depending on other variables - I'll decide whether that's what I even want to call (Since the paint() method is the only one I can call).</p> <p>Am I going about this completely wrong? Never bothered with this before.</p> <p>To give you a better idea of what I want to end up with: I want to be able to pass the coordinates of the shape I want to add for the node, and then add it to whatever I have on the graph so far. And then same with the edges, I want to be able to pass the beginning and end point of the line to repaint on top of whatever is existing at that time.</p> <p>Not exactly what I want right now - but you'll get the idea from what I patched together so far:</p> <pre><code>import java.awt.*; import javax.swing.*; public class MyCanvas extends Canvas { public MyCanvas() { } public void paint(Graphics graphics) { // Keep this until I figured out if it's painted on load or not. graphics.drawLine(10, 20, 350, 380); } public static void main(String[] args) { MyCanvas canvas = new MyCanvas(); JFrame frame = new JFrame(); int vertexes = 0; // Change this next part later to be dynamic. vertexes = 10; int canvasSize = vertexes * vertexes; frame.setSize(canvasSize, canvasSize); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().add(canvas); frame.setVisible(true); } public void drawNode(int x, int y, Graphics g) { // Treat each location as a 10x10 block. If position 1,1 then go to (5,5) - If position 3,5 then go to (25, 45) eg: (x*10)-5, (y*10)-5 int xLoc = (x*10) - 5; int yLoc = (y*10) - 5; g.setColor(Color.white); g.fillOval(xLoc, yLoc, 8, 8); g.drawOval(xLoc, yLoc, 8, 8); } public void drawArc(int x, int y, int xx, int yy, Graphics g) { int xLoc = (x*10) - 5; int yLoc = (y*10) - 5; int xxLoc = (xx*10) - 5; int yyLoc = (yy*10) - 5; g.drawLine(xLoc, yLoc, xxLoc, yyLoc); } } </code></pre> <p>Edit: (Response for Andrew)</p> <pre><code>import java.awt.*; import java.awt.image.BufferedImage; import javax.swing.*; public class MyCanvas extends JPanel { public MyCanvas() { } public void paintComponent(Graphics g) { super.paintComponent(g); } public static void main(String[] args) { int vertexes = 0; // Change this next part later to be dynamic. vertexes = 10; int canvasSize = vertexes * vertexes; JFrame frame = new JFrame(); JLabel label = new JLabel(); BufferedImage bImage = new BufferedImage(canvasSize, canvasSize, BufferedImage.TYPE_INT_ARGB); Graphics2D g2d = bImage.createGraphics(); g2d.drawLine(50, 50, 300, 300); ImageIcon iIcon = new ImageIcon(bImage); label.setIcon(iIcon); frame.add(label); frame.setVisible(true); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); g2d = drawNode(1,1,g2d); label.repaint(); } public static Graphics2D drawNode(int x, int y,Graphics2D g2d) { // Treat each location as a 10x10 block. If position 1,1 then go to (5,5) - If position 3,5 then go to (25, 45) eg: (x*10)-5, (y*10)-5 int xLoc = (x*10) - 5; int yLoc = (y*10) - 5; g2d.setColor(Color.white); g2d.fillOval(xLoc, yLoc, 8, 8); g2d.drawOval(xLoc, yLoc, 8, 8); return g2d; } public static void drawArc(int x, int y, int xx, int yy) { int xLoc = (x*10) - 5; int yLoc = (y*10) - 5; int xxLoc = (xx*10) - 5; int yyLoc = (yy*10) - 5; // g.drawLine(xLoc, yLoc, xxLoc, yyLoc); } } </code></pre>
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    1. CODon't mix Swing (e.g. `JFrame`) and AWT (e.g. `Canvas`) components. Instead of the `Canvas`, use a `JPanel` & override `paintComponent(Graphics)`.
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