Plot
/*
* Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
* All rights reserved. Software written by Ian F. Darwin and others.
* $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
* cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
* pioneering role in inventing and promulgating (and standardizing) the Java
* language and environment is gratefully acknowledged.
*
* The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
* inventing predecessor languages C and C++ is also gratefully acknowledged.
*/
import javax.comm.*;
import java.util.*;
import java.io.*;
import java.lang.*;
import java.awt.*;
import java.awt.event.*;
/** Main program, driver for Plotter class.
* This is to simulate a larger graphics application such as GnuPlot.
*/
public class PlotDriver {
/** Construct a Plotter driver, and try it out. */
public static void main(String[] argv)
{
Plotter r ;
// if (argv.length != 1) {
// System.err.println("Usage: PlotDriver driverclass");
// return;
// }
try {
Class c = Class.forName("PlotterAWT");
Object o = c.newInstance();
if (!(o instanceof Plotter))
throw new ClassNotFoundException("Not instanceof Plotter");
r = (Plotter)o;
} catch (ClassNotFoundException e) {
System.err.println("Sorry, "+argv[0]+" not a plotter class");
return;
} catch (Exception e) {
e.printStackTrace();
return;
}
r.penDown();
r.penColor(1);
r.moveTo(200, 200);
r.penColor(2);
r.drawBox(123, 200);
r.rmoveTo(10, 20);
r.penColor(3);
r.drawBox(123, 200);
r.penUp();
r.moveTo(300, 100);
r.penDown();
r.setFont("Helvetica", 14);
r.drawString("Hello World");
r.penColor(4);
r.drawBox(10, 10);
}
}
/**
* Plotter abstract class. Must be subclassed
* for X, DOS, Penman, HP plotter, etc.
*
* Coordinate space: X = 0 at left, increases to right.
* Y = 0 at top, increases downward (same as AWT).
*
* @author Ian F. Darwin
*/
abstract class Plotter {
public final int MAXX = 800;
public final int MAXY = 600;
/** Current X co-ordinate (same reference frame as AWT!) */
protected int curx;
/** Current Y co-ordinate (same reference frame as AWT!) */
protected int cury;
/** The current state: up or down */
protected boolean penIsUp;
/** The current color */
protected int penColor;
Plotter() {
penIsUp = true;
curx = 0; cury = 0;
}
abstract void rmoveTo(int incrx, int incry);
abstract void moveTo(int absx, int absy);
abstract void penUp();
abstract void penDown();
abstract void penColor(int c);
abstract void setFont(String fName, int fSize);
abstract void drawString(String s);
/* Concrete methods */
/** Draw a box of width w and height h */
public void drawBox(int w, int h) {
penDown();
rmoveTo(w, 0);
rmoveTo(0, h);
rmoveTo(-w, 0);
rmoveTo(0, -h);
penUp();
}
/** Draw a box given an AWT Dimension for its size */
public void drawBox(java.awt.Dimension d) {
drawBox(d.width, d.height);
}
/** Draw a box given an AWT Rectangle for its location and size */
public void drawBox(java.awt.Rectangle r) {
moveTo(r.x, r.y);
drawBox(r.width, r.height);
}
}
/**
* A Plotter subclass for drawing into an AWT Window. Reflecting back
* to AWT gives us a "known working" plotter to test on.
* You can also steal this as a basis for your own plotter driver.
* @author Ian Darwin
*/
class PlotterAWT extends Plotter {
Frame f;
PCanvas p;
Graphics g;
Font font;
FontMetrics fontMetrics;
PlotterAWT() {
super();
f = new Frame("Plotter");
p = new PCanvas(MAXX, MAXY);
f.add(p);
f.pack();
f.setVisible(true);
g = p.getOsGraphics();
}
public void drawBox(int w, int h) {
g.drawRect(curx, cury, w, h);
p.repaint();
}
public void rmoveTo(int incrx, int incry){
moveTo(curx += incrx, cury += incry);
}
public void moveTo(int absx, int absy){
if (!penIsUp)
g.drawLine(curx, cury, absx, absy);
curx = absx;
cury = absy;
}
public void setdir(float deg){}
void penUp(){ penIsUp = true; }
void penDown(){ penIsUp = false; }
void penColor(int c){
switch(c) {
case 0: g.setColor(Color.white); break;
case 1: g.setColor(Color.black); break;
case 2: g.setColor(Color.red); break;
case 3: g.setColor(Color.green); break;
case 4: g.setColor(Color.blue); break;
default: g.setColor(new Color(c)); break;
}
}
void setFont(String fName, int fSize) {
font = new Font(fName, Font.BOLD, fSize);
fontMetrics = p.getFontMetrics(font);
}
void drawString(String s) {
g.drawString(s, curx, cury);
curx += fontMetrics.stringWidth(s);
}
/** A Member Class that contains an off-screen Image that is
* drawn into; this component's paint() copies from there to
* the screen. This avoids having to keep a list of all the
* things that have been drawn.
*/
class PCanvas extends Canvas {
Image offScreenImage;
int width;
int height;
Graphics pg;
PCanvas(int w, int h) {
width = w;
height = h;
setBackground(Color.white);
setForeground(Color.red);
}
public Graphics getOsGraphics() {
return pg;
}
/** This is called by AWT after the native window peer is created,
* and before paint() is called for the first time, so
* is a good time to create images and the like.
*/
public void addNotify() {
super.addNotify();
offScreenImage = createImage(width, height);
// assert (offScreenImage != null);
pg = offScreenImage.getGraphics();
}
public void paint(Graphics pg) {
pg.drawImage(offScreenImage, 0, 0, null);
}
public Dimension getPreferredSize() {
return new Dimension(width, height);
}
}
}
/** Plotter class for testing higher-level software. */
class PlotterDummy extends Plotter {
/** Constructor: nothing to do */
PlotterDummy() {
super();
}
/** move to absolute location */
void moveTo(int absx, int absy) {
curx = absx;
cury = absy;
System.out.println("moveTo ["+curx+","+cury+"]");
}
/** move to relative location */
void rmoveTo(int incrx, int incry) {
curx += incrx;
cury += incry;
System.out.println("rmoveTo ["+curx+","+cury+"]");
}
public void setFont(java.lang.String fName, int fSize) {
System.out.println("set Font to " + fName);
}
public void drawString(java.lang.String s) {
System.out.println("Draw the string \"" + s + "\"");
}
void setPenState(boolean up) {
penIsUp = up;
System.out.println("Pen Up is ["+penIsUp+"]");
}
void penUp() {
setPenState(true);
}
void penDown() {
setPenState(false);
}
void penColor(int c) {
penColor = c;
System.out.println("PenColor is ["+penColor+"]");
}
}
/**
* A Plotter subclass for drawing on a Penman plotter.
* These were made in the UK and sold into North American markets.
* It is a little "turtle" style robot plotter that communicates
* over a serial port. For this, we use the "Java Communicatons" API.
* Java Communications is a "standard extention" and must be downloaded
* and installed separately from the JDK before you can even compile this
* program.
*
* @author Ian Darwin, http://www.darwinsys.com/
*/
class Penman extends Plotter {
private final String OK_PROMPT = "\r\n!";
private final int MAX_REPLY_BYTES = 50; // paranoid upper bound
private SerialPort tty;
private DataInputStream is;
private DataOutputStream os;
/** Construct a Penman plotter object */
public Penman() throws NoSuchPortException,PortInUseException,
IOException,UnsupportedCommOperationException {
super();
init_comm("COM2"); // setup serial commx
init_plotter(); // set plotter to good state
}
private void init_plotter() {
send("I"); expect('!'); // eat VERSION etc., up to !
send("I"); expect('!'); // wait for it!
send("H"); // find home position
expect('!'); // wait for it!
send("A"); // Set to use absolute coordinates
expect('!');
curx = cury = 0;
penUp();
}
//
// PUBLIC DRAWING ROUTINES
//
public void setFont(String fName, int fSize) {
// Font name is ignored for now...
// Penman's size is in mm, fsize in points (inch/72).
int size = (int)(fSize*25.4f/72);
send("S"+size + ","); expect(OK_PROMPT);
System.err.println("Font set request: " + fName + "/" + fSize);
}
public void drawString(String mesg) {
send("L" + mesg + "\r"); expect(OK_PROMPT);
}
/** Move to a relative location */
public void rmoveTo(int incrx, int incry){
moveTo(curx + incrx, cury + incry);
}
/** move to absolute location */
public void moveTo(int absx, int absy) {
System.err.println("moveTo ["+absx+","+absy+"]");
curx = absx;
cury = absy;
send("M" + curx + "," + cury + ","); expect(OK_PROMPT);
}
private void setPenState(boolean up) {
penIsUp = up;
System.err.println("Pen Up is ["+penIsUp+"]");
}
public void penUp() {
setPenState(true);
send("U"); expect(OK_PROMPT);
}
public void penDown() {
setPenState(false);
send("D"); expect(OK_PROMPT);
}
public void penColor(int c) {
penColor = (c%3)+1; // only has 3 pens, 4->1
System.err.println("PenColor is ["+penColor+"]");
send("P" + c + ","); expect(OK_PROMPT);
}
//
// PRIVATE COMMUNICATION ROUTINES
//
/** Set up communication.
* <br/>
* XXX: Should probably re-use CommPortOpen instead.
*/
private void init_comm(String portName) throws NoSuchPortException,PortInUseException,
IOException,UnsupportedCommOperationException {
// get list of ports available on this particular computer.
// Enumeration pList = CommPortIdentifier.getPortIdentifiers();
// Print the list. A GUI program would put these in a chooser!
// while (pList.hasMoreElements()) {
// CommPortIdentifier cpi = (CommPortIdentifier)pList.nextElement();
// System.err.println("Port " + cpi.getName());
// }
// Open a port.
CommPortIdentifier port =
CommPortIdentifier.getPortIdentifier(portName);
// This form of open takes an Application Name and a timeout.
tty = (SerialPort) port.open("Penman Driver", 1000);
// set up the serial port
tty.setSerialPortParams(9600, SerialPort.DATABITS_8,
SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
tty.setFlowControlMode(SerialPort.FLOWCONTROL_RTSCTS_OUT|
SerialPort.FLOWCONTROL_RTSCTS_OUT);
// Get the input and output streams
is = new DataInputStream(tty.getInputStream());
os = new DataOutputStream(tty.getOutputStream());
}
/** Send a command to the plotter. Although the argument is a String,
* we send each char as a *byte*, so avoid 16-bit characters!
* Not that it matters: the Penman only knows about 8-bit chars.
*/
private void send(String s) {
System.err.println("sending " + s + "...");
try {
for (int i=0; i<s.length(); i++)
os.writeByte(s.charAt(i));
} catch(IOException e) {
e.printStackTrace();
}
}
/** Expect a given CHAR for a result */
private void expect(char s) {
byte b;
try {
for (int i=0; i<MAX_REPLY_BYTES; i++){
if ((b = is.readByte()) == s) {
return;
}
System.err.print((char)b);
}
} catch (IOException e) {
System.err.println("Penman:expect(char "+s+"): Read failed");
System.exit(1);
}
System.err.println("ARGHH!");
}
/** Expect a given String for a result */
private void expect(String s) {
byte ans[] = new byte[s.length()];
System.err.println("expect " + s + " ...");
try {
is.read(ans);
} catch (IOException e) {
System.err.println("Penman:expect(String "+s+"): Read failed");
System.exit(1);
};
for (int i=0; i<s.length() && i<ans.length; i++)
if (ans[i] != s.charAt(i)) {
System.err.println("MISMATCH");
break;
}
System.err.println("GOT: " + new String(ans));
}
}
Related examples in the same category
