[Library] Turing-like drawing functions

rizzix · **Posted:** Sat Feb 21, 2004 11:22 pm

it's like turing with "offscreenonly" mode on always. I'll be adding more to it soon.

Java:

import javax.swing.*;
import java.awt.*;
import java.awt.image.*;

public abstract class BufferedCanvas extends Canvas {

private Image bImage; // offscreen buffer
private Graphics bg = null; // offscreen graphics context
private Graphics2D g2d = null; // onscreen graphics context
private int w, h; // width and height of canvas (Component)
private Container parent;

BufferedCanvas(Container parent) {
super();
setBackground(Color.black);
this.parent = parent;
}

public void paint(Graphics g) {
g2d = (Graphics2D) g; // cast to Graphics2D (just in case)
// create a new buffer image
bImage = createImage(maxx(), maxy());
bg = bImage.getGraphics();// get Graphics context for image

offscreenPaint();

bg.dispose(); // dispose graphics context
bImage.flush(); // flush (empty) image
bg = null;
}

abstract protected void offscreenPaint();

public void update() {
g2d.drawImage(bImage, 0, 0, this); // load buffer to screen
}

public void setColor(Color clr) {
if (bg != null) {
bg.setColor(clr);
}
}

public void setFont(Font fnt) {
if (bg != null) {
bg.setFont(fnt);
}
}

public void setXORMode(Color clr) {
if (bg != null) {
bg.setXORMode(clr);
}
}

public void drawline(int x1, int y1, int x2, int y2) {
if (bg != null) {
bg.drawLine(x1, y1, x2, y2);
}
}

public void drawline(int x1, int y1, int x2, int y2, Color clr) {
if (bg != null) {
Color currentColor = bg.getColor();
bg.setColor(clr);
bg.drawLine(x1, y1, x2, y2);
bg.setColor(currentColor);
}
}

public void drawarc(int x, int y, int w, int h, int startAngle, int arcAngle) {
if (bg != null) {
bg.drawArc(x, y, w, h, startAngle, arcAngle);
}
}

public void drawarc(int x, int y, int w, int h, int startAngle, int arcAngle, Color clr) {
if (bg != null) {
Color currentColor = bg.getColor();
bg.setColor(clr);
bg.drawArc(x, y, w, h, startAngle, arcAngle);
bg.setColor(currentColor);
}
}

public void drawfillarc(int x, int y, int w, int h, int startAngle, int arcAngle) {
if (bg != null) {
bg.fillArc(x, y, w, h, startAngle, arcAngle);
}
}

public void drawfillarc(int x, int y, int w, int h, int startAngle, int arcAngle, Color clr) {
if (bg != null) {
Color currentColor = bg.getColor();
bg.setColor(clr);
bg.fillArc(x, y, w, h, startAngle, arcAngle);
bg.setColor(currentColor);
}
}

public void drawoval(int x, int y, int w, int h) {
if (bg != null) {
bg.drawOval(x, y, w, h);
}
}

public void drawoval(int x, int y, int w, int h, Color clr) {
if (bg != null) {
Color currentColor = bg.getColor();
bg.setColor(clr);
bg.drawOval(x, y, w, h);
bg.setColor(currentColor);
}
}

public void drawfilloval(int x, int y, int w, int h) {
if (bg != null) {
bg.fillOval(x, y, w, h);
}
}

public void drawfilloval(int x, int y, int w, int h, Color clr) {
if (bg != null) {
Color currentColor = bg.getColor();
bg.setColor(clr);
bg.fillOval(x, y, w, h);
bg.setColor(currentColor);
}
}

public void drawroundbox(int x, int y, int w, int h, int arcw, int arch) {
if (bg != null) {
bg.drawRoundRect(x, y, w, h, arcw, arch);
}
}

public void drawroundbox(int x, int y, int w, int h, int arcw, int arch, Color clr) {
if (bg != null) {
Color currentColor = bg.getColor();
bg.setColor(clr);
bg.drawRoundRect(x, y, w, h, arcw, arch);
bg.setColor(currentColor);
}
}

public void drawfillroundbox(int x, int y, int w, int h, int arcw, int arch) {
if (bg != null) {
bg.fillRoundRect(x, y, w, h, arcw, arch);
}
}

public void drawfillroundbox(int x, int y, int w, int h, int arcw, int arch, Color clr) {
if (bg != null) {
Color currentColor = bg.getColor();
bg.setColor(clr);
bg.fillRoundRect(x, y, w, h, arcw, arch);
bg.setColor(currentColor);
}
}

public void drawbox(int x, int y, int w, int h) {
if (bg != null) {
bg.drawRect(x, y, w, h);
}
}

public void drawbox(int x, int y, int w, int h, Color clr) {
if (bg != null) {
Color currentColor = bg.getColor();
bg.setColor(clr);
bg.drawRect(x, y, w, h);
bg.setColor(currentColor);
}
}

public void drawfillbox(int x, int y, int w, int h) {
if (bg != null) {
bg.fillRect(x, y, w, h);
}
}

public void drawfillbox(int x, int y, int w, int h, Color clr) {
if (bg != null) {
Color currentColor = bg.getColor();
bg.setColor(clr);
bg.fillRect(x, y, w, h);
bg.setColor(currentColor);
}
}

public void draw3Dbox(int x, int y, int w, int h, boolean raised) {
if (bg != null) {
bg.draw3DRect(x, y, w, h, raised);
}
}

public void draw3Dbox(int x, int y, int w, int h, boolean raised, Color clr) {
if (bg != null) {
Color currentColor = bg.getColor();
bg.setColor(clr);
bg.draw3DRect(x, y, w, h, raised);
bg.setColor(currentColor);
}
}

public void drawString(String str, int x, int y) {
if (bg != null) {
bg.drawString(str, x, y);
}
}

public void delay(int msec) {
try {
Thread.sleep(msec);
} catch (Exception e) {
System.err.println(e);
}
}

public int maxx() {
return parent.getBounds().width;
}

public int maxy() {
return parent.getBounds().height;
}
}

here's how you use it:

Java:

import java.awt.*;
import javax.swing.JFrame;

class DrawView extends BufferedCanvas {

DrawView(JFrame parent) {
super(parent);
}

protected void offscreenPaint() {
setXORMode(Color.white); // set white as the XORed colour

for (int i = 0; i < maxx(); i++)
{
drawline(0, 0 ,i, 400); // drawn in white (on buffer)
drawoval(i, i % 200, 100, 100);
update();
drawline(0, 0, i, 400); // drawn in background color (XORed)
drawoval(i, i % 200, 100, 100);
}
}
}

Homer_simpson · **Posted:** Fri Feb 27, 2004 6:10 pm

this is purty awsome dude...
i made some 3d engine graphical thingy too... i'll post it up soon...

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