/*
* Screen.java - Video Terminal v 0.4
* Copyright (C) 2000,2001 VERHILLE Arnaud
* gist@wanadoo.fr
* http://www.chez.com/apple1/
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
package apple1;
import java.awt.*;
import java.awt.event.*;
import java.io.FileInputStream;
import java.net.URL;
import java.io.DataInputStream;
/**
* The Screen Class Behave like the TV interface + The TV itself
*
* @author VERHILLE Arnaud
* @created 21 octobre 2000
*/
public class Screen extends Canvas {
private int charac[][];
private int screenTbl[][];
private int indexX, indexY;
private int pixelSize;
private boolean scanline;
private int terminalSpeed;
private Image offScrImg;
private long lastTime = System.currentTimeMillis();
private boolean appletMode = false;
private URL appletCodeBase;
/**
* Constructor for the Screen object
*
* @param pixelSize Choose your pixel Size
*/
public Screen(int pixelSize) {
charac = new int[0x80][8];
screenTbl = new int[40][24];
loadCharac();
this.pixelSize = pixelSize;
if (pixelSize == 1) {
scanline = false;
}
terminalSpeed = 60;
// 60 charac/s is the genuine speed
reset();
}
/**
* Constructor for the Screen object in Applet Mode
*
* @param pixelSize Choose your pixel Size
* @param appletCodeBase The Applet URL
* @param appletMode Must be true
*/
public Screen(int pixelSize,URL appletCodeBase,boolean appletMode) {
charac = new int[0x80][8];
screenTbl = new int[40][24];
this.appletMode = appletMode;
scanline = false;
this.appletCodeBase = appletCodeBase;
loadCharac();
this.pixelSize = pixelSize;
terminalSpeed = 60;
// 60 charac/s is the genuine speed
reset();
}
/**
* Sets the PixelSize attribute of the Screen object
*
* @param ps The new PixelSize value
*/
public void setPixelSize(int ps) {
pixelSize = ps;
}
/**
* Sets scanlines
*
* @param scanline Scanline on or off
*/
public void setScanline(boolean scanline) {
this.scanline = scanline;
}
/**
* Sets the TerminalSpeed attribute of the Screen object
*
* @param ts The new TerminalSpeed value
*/
public void setTerminalSpeed(int ts) {
terminalSpeed = ts;
}
/**
* Reset the Screen by Filling it with no character
*/
public void reset() {
indexX = indexY = 0;
initScreenTbl();
repaint();
}
//*************************************************
//************** Video Terminal *******************
//*************************************************
/**
* Read the Pia Output and Ouput a character on Display
*
* @param dsp Pia Output
*/
public void outputDsp(int dsp) {
switch (dsp) {
case 0x00:
// Nothing
break;
case 0x5F:
// Backspace
if (indexX == 0) {
indexY--;
indexX = 39;
}
else {
indexX--;
}
screenTbl[indexX][indexY] = 0x00;
break;
case 0x0A:
// End of Line
indexX = 0;
indexY++;
break;
case 0x0D:
// End of Line
indexX = 0;
indexY++;
break;
case 0x7F:
// Nothing (Dsp Register Mask)
break;
default:
// Standard Charac
screenTbl[indexX][indexY] = dsp;
indexX++;
// Place for next Charc
break;
}
if (indexX == 40) {
indexX = 0;
indexY++;
}
if (indexY == 24) {
newLine();
indexY--;
}
repaint();
synchronizeOutput();
}
//**************************************************
//*************** Graphical Methods ****************
//**************************************************
/**
* The Classic update() Method (Use of Double Buffering)
*
* @param gc The Graphic Context
*/
public void update(Graphics gc) {
if (offScrImg == null) {
// Double Buffering :-)
offScrImg = createImage(280 * pixelSize, 192 * pixelSize);
}
Graphics og = offScrImg.getGraphics();
paint(og);
gc.drawImage(offScrImg, 0, 0, this);
og.dispose();
}
/**
* The Classic paint() Method
*
* @param gc The Graphic Context
*/
public void paint(Graphics gc) {
int i;
int j;
int xPosition;
int yPosition;
// Charac Resolution 7x8 ; Matrix 5x7
// Screen Resolution 280x192
gc.setColor(Color.black);
gc.fillRect(0, 0, 280 * pixelSize, 192 * pixelSize);
gc.setColor(Color.green);
for (i = 0; i < 40; i++) {
for (j = 0; j < 24; j++) {
xPosition = i * (pixelSize * 7);
yPosition = j * (pixelSize * 8);
drawCharac(gc, xPosition, yPosition,screenTbl[i][j]);
}
} // Cursor
drawCharac(gc, indexX * (pixelSize * 7), indexY * (pixelSize * 8), 0x01);
}
/**
* Synchronize the Terminal Output on terminalSpeed char/s
* This method froze the whole program when it wait (This is not really a problem)
*/
private void synchronizeOutput() {
// Apple1 Terminal Output terminalSpeed Charac each second
int sleepMillis = (int) ((1000 / terminalSpeed) - (System.currentTimeMillis() - lastTime));
if (sleepMillis > 0) {
try {
Thread.sleep(sleepMillis);
}
catch (Exception e) {
System.out.println(e);
}
}
lastTime = System.currentTimeMillis();
}
/**
* Draw a Character from the Character Table on Display
*
* @param gc The Graphic Context
* @param xPosition The Upper Left X position
* @param yPosition The upper left Y position
* @param characNumber The Character Value [0x00 -> 0xFF]
*/
private void drawCharac(Graphics gc, int xPosition,
int yPosition, int characNumber) {
int k;
int l;
gc.setColor(Color.green);
for (k = 0; k < 8; k++) {
for (l = 1; l < 8; l++) {
// first bit unused (color in apple2)
if ((charac[characNumber][k] & (0x01 << l)) == (0x01 << l)) {
gc.fillRect(xPosition + pixelSize * (l - 1), yPosition + pixelSize * k, pixelSize, pixelSize - (scanline ? 1 : 0));
}
}
}
}
//******************************************************
//******************** Utility methods *****************
//******************************************************
/**
* Create the Charactere Table from apple1.vid
* Depend on appletMode (Executable or URL Access)
*/
private void loadCharac() {
if (appletMode == false){ // Normal File Access
String filename = System.getProperty("user.dir") + "/bios/apple1.vid";
FileInputStream fis = null;
try {
fis = new FileInputStream(filename);
int i;
int j;
for (i = 0; i < 0x80; i++) {
for (j = 0; j < 8; j++) {
charac[i][j] = fis.read();
}
}
fis.close();
}
catch (Exception e) {
System.out.println(e);
}
} else { //URL Applet File Access Mode
try {
URL u = new URL(appletCodeBase,"apple1.vid");
DataInputStream fis = null;
fis = new DataInputStream (u.openStream());
int i;
int j;
for (i = 0; i < 0x80; i++) {
for (j = 0; j < 8; j++) {
charac[i][j] = fis.read();
}
}
fis.close();
} catch (Exception e) {
System.out.println(e);
System.out.println("URL Error Access in Screen.class");
return;
}
}
}
/**
* Fill the Screen Table with No Character
*/
private void initScreenTbl() {
int i;
int j;
for (i = 0; i < 40; i++) {
for (j = 0; j < 24; j++) {
screenTbl[i][j] = 0x00;
}
}
}
/**
* Create a new line and scroll the old lines
*/
private void newLine() {
int i;
int j;
for (i = 0; i < 40; i++) {
for (j = 0; j < 23; j++) {
screenTbl[i][j] = screenTbl[i][j + 1];
}
}
for (i = 0; i < 40; i++) {
screenTbl[i][23] = 0x00;
}
}
}