import java.applet.*; import java.awt.*; import java.util.*; public class Euclid extends Applet{ Button cont,buttonRE; int number = 0; int P_array[] = new int[20]; int Q_array[] = new int[20]; int count = 0; Panel introPanel,cards,euclidPanel,leftCard,doubleCard; TextField P_Field, Q_Field ; int P,Q; int P_start,Q_start; TopCanvas topCanvas; LeftCanvas leftCanvas; MiddleCanvas middleCanvas; RightCanvas rightCanvas; BottomCanvas bottomCanvas, otherbottomCanvas; SubstituePanel substitutePanel; AnimateCanvas animateCanvas; final static String INTROPANEL = "Start Panel" ; final static String EUCLIDPANEL = "Euclid Panel" ; final static String SUBSTITUTEPANEL = "Substitute Panel" ; final static String RECTANGLE = "Rectangle Canvas" ; final static String ANIMATE = "Animate Canvas" ; public String getAppletInfo(){ return "Name: Euclid\n" + "Author: Steve Traylen\n"; } public void init(){ Graphics g = getGraphics(); // Set Up The Intro Page. Dimension dim = size(); introPanel = new Panel(); introPanel.setBackground(Color.white); introPanel.setLayout(new GridLayout(4,1)); introPanel.setFont(new Font("Helvetica", Font.PLAIN,14)); introPanel.setBackground(Color.yellow); // Question Panel. Panel questionPanel = new Panel(); //questionPanel.setLayout(new GridLayout(1,2)); Label question = new Label("Enter two co-prime numbers, P and Q, to solve\n"); questionPanel.add(question); questionPanel.add(new Label("Px + Qy = 1")); introPanel.add(questionPanel); // Values Panels. Panel P_Panel = new Panel(); Label P_label = new Label("P ="); P_Field = new TextField("19",5); P_Field.setBackground(Color.white); P_Panel.add(P_label); P_Panel.add(P_Field); introPanel.add(P_Panel); Panel Q_Panel = new Panel(); Label Q_label = new Label("Q ="); P_Field.setBackground(Color.white); Q_Field = new TextField("83",5); Q_Field.setBackground(Color.white); Q_Panel.add(Q_label); Q_Panel.add(Q_Field); introPanel.add(Q_Panel); // Continue Panel Panel contPanel = new Panel(); cont = new Button("Continue"); cont.setBackground(Color.white); contPanel.add(cont); introPanel.add(contPanel); //Euclid Panel to make up the other card. euclidPanel = new Panel(); euclidPanel.setBackground(Color.yellow); euclidPanel.setFont(new Font("Helvetica", Font.PLAIN,12)); euclidPanel.setLayout(new BorderLayout()); // Top Panel Panel topPanel = new Panel(); topCanvas = new TopCanvas(4*Globals.Width/5,1*Globals.Height/20); //topCanvas.setBackground(Color.green); topPanel.add(topCanvas); buttonRE = new Button("Restart"); buttonRE.setBackground(Color.white); //buttonRE.setForeground(Color.white); //buttonRE.setBackground(Color.black); topPanel.add(buttonRE); euclidPanel.add("North",topPanel); // Left Rectangle Canvas leftCanvas = new LeftCanvas(4*Globals.Width/10,15*Globals.Height/20); //leftCanvas.setBackground(Color.white); // Animate Canvas animateCanvas = new AnimateCanvas(4*Globals.Width/10,15*Globals.Height/20); //animateCanvas.setBackground(Color.white); // Left Cards. leftCard = new Panel(); leftCard.setLayout(new CardLayout()); leftCard.add(RECTANGLE,leftCanvas); leftCard.add(ANIMATE,animateCanvas); euclidPanel.add("West",leftCard); // Middle Canvas middleCanvas = new MiddleCanvas(3*Globals.Width/10,15*Globals.Height/20); //middleCanvas.setBackground(Color.yellow); euclidPanel.add("Center",middleCanvas); // Right Canvas rightCanvas = new RightCanvas(3*Globals.Width/10,15*Globals.Height/20); //rightCanvas.setBackground(Color.red); euclidPanel.add("East",rightCanvas); // Bottom Panel bottomCanvas = new BottomCanvas(Globals.Width,4*Globals.Height/20); bottomCanvas.setBackground(Color.yellow); //bottomCanvas.setBackground(Color.green); euclidPanel.add("South",bottomCanvas); // Substitute Panel cards = new Panel(); cards.setLayout(new CardLayout ()); substitutePanel = new SubstituePanel(Globals.Width,Globals.Height,cards); substitutePanel.setBackground(Color.yellow); substitutePanel.setFont(new Font("Helvetica", Font.PLAIN,10)); // Cards Panel cards.add(INTROPANEL, introPanel); cards.add(EUCLIDPANEL, euclidPanel); cards.add(SUBSTITUTEPANEL, substitutePanel); cards.setBackground(Color.white); setBackground(Color.white); add(cards); validate(); g.dispose(); } public boolean action(Event event,Object arg){ if (event.target == cont){ String P_string = P_Field.getText(); String Q_string = Q_Field.getText(); P = Integer.valueOf(P_string).intValue(); Q = Integer.valueOf(Q_string).intValue(); // Force P to be the Largest. if ( Q > P ){ int dummy ; dummy = P ; P = Q ; Q = dummy ; } //Graphics g = topPanel.getGraphics ; P_start = P; Q_start = Q; //cont.disable(); rightCanvas.disable(); bottomCanvas.messageAdd('A'); number = 0; count = 0 ; leftCanvas.displayBoxes(P,Q,number); leftCanvas.enable(); topCanvas.displayEquation(P,Q); middleCanvas.displayEquation(P,Q,number); ((CardLayout)cards.getLayout()).show(cards,EUCLIDPANEL); ((CardLayout)leftCard.getLayout()).show(leftCard,RECTANGLE); return(true); } if ( event.target == buttonRE ){ ((CardLayout)cards.getLayout()).show(cards,INTROPANEL); cont.enable(); // Set things back to the start. count = 0; number = 0; return(true); } return(true); } public void start(){ count = 0 ; number = 0; cont.enable(); ((CardLayout)cards.getLayout()).show(cards,INTROPANEL); } public boolean mouseDown(Event event, int x, int y){ int remainder; remainder = P - (number*Q) ; if(event.target == leftCanvas){ if( remainder > Q ){ number = number + 1 ; leftCanvas.displayBoxes(P,Q,number); middleCanvas.displayEquation(P,Q,number); } if( remainder < 2*Q && remainder > Q ){ P_array[count] = P; Q_array[count] = Q; bottomCanvas.messageAdd('B'); rightCanvas.addStuff(P_array,Q_array,count); count = count + 1; return(true); } if( remainder < Q && remainder != 1 ){ ((CardLayout)leftCard.getLayout()).show(leftCard,ANIMATE); animateCanvas.slide(P,Q); bottomCanvas.messageAdd('C'); return(true); } if(remainder == 1){ bottomCanvas.messageAdd('D'); leftCanvas.disable(); rightCanvas.enable(); return(true); } if(remainder == Q){ bottomCanvas.messageAdd('E'); return(true); } return(true); } if(event.target == animateCanvas){ P = Q; Q = remainder; number = 0; ((CardLayout)leftCard.getLayout()).show(leftCard,RECTANGLE); leftCanvas.displayBoxes(P,Q,number); middleCanvas.displayEquation(P,Q,number); return(true); } if(event.target == rightCanvas){ substitutePanel.go(P_array,Q_array,count,0); ((CardLayout)cards.getLayout()).show(cards,SUBSTITUTEPANEL); return(true); } return(true); } } class TopCanvas extends Canvas { int P,Q; Euclid display ; int width,height ; public TopCanvas (int width,int height){ super(); this.width = width ; this.height = height ; } public void displayEquation(int P,int Q){ this.P = P ; this.Q = Q ; repaint(); } public void paint(Graphics g){ //g.fillRect(0,0,200,200); Dimension d = size(); g.drawString("Your Problem: " + P+"x + "+Q+"y = 1", 50, 20); } public Dimension preferredSize(){ return new Dimension(width,height); } public synchronized Dimension minimumSize(){ return new Dimension(width,height); } } class LeftCanvas extends Canvas { int P,Q ; int number; float dummy ; int width,height; Euclid display; Dimension d; public LeftCanvas (int width,int height){ super(); this.width = width; this.height = height; } public void displayBoxes(int P, int Q, int number){ this.P = P; this.Q = Q; this.number = number; repaint(); } public void paint(Graphics g){ g.setColor(Color.white); g.fillRect(2,2,width-5,height-3); g.setColor(Color.black); Dimension d = size(); float moveup = 0 ; float moveright = 0; int border = 20; float boxwidth = (float)width - ((float)2 * (float)border); float boxheight = ((float)P/(float)Q)*boxwidth ; if(boxheight > (float)height - ((float)2*(float)border)){ dummy = ((float)height-((float)2*(float)border))/(float)boxheight ; dummy = dummy * (float)boxwidth ; boxwidth = dummy ; boxheight = (float)height-((float)2*(float)border); } moveright = (((float)width - ((float)2*(float)border)) - (float)boxwidth)/(float)2 ; moveright = (float)border+moveright ; moveup = (((float)height - ((float)2*(float)border)) - boxheight)/(float)2 ; moveup = (float)border + moveup; g.setColor(Color.blue); g.fillRect((int)(moveright+1),(int)(moveup+1),(int)(boxwidth+1),(int)(boxheight+1)); if( number > 0){ g.setColor(Color.yellow); g.fillRect((int)(moveright+1),(int)(moveup+1),(int)(boxwidth+1),(int)((number*boxwidth))); } g.setColor(Color.black); g.drawString(""+P+"",(int)((width/2)-(boxwidth/2)-((3*border)/4))-4,(int)((height/2)+1)); g.drawString(""+Q+"",(int)((width/2)+1)-3,(int)((height/2)-(boxheight/2)-(border/4))); for(int i = 0; i < number; i++){ g.drawLine((int)(moveright+boxwidth+1),(int)(moveup+((i+1)*boxwidth)),(int)(moveright+1),(int)(moveup+((i+1)*boxwidth))); g.drawString(""+Q+"",(int)(moveright+3),(int)(moveup+(i+0.5)*boxwidth+5)); } g.drawRect((int)(moveright+1),(int)(moveup+1),(int)(boxwidth+1),(int)(boxheight+1)); g.drawRect(2,2,width-5,height-3); } public Dimension preferredSize(){ return new Dimension(width,height); } public synchronized Dimension minimumSize(){ return new Dimension(width,height); } } class MiddleCanvas extends Canvas { int width; int height; int number; int P,Q; public MiddleCanvas (int width,int height){ this.width = width; this.height = height; } public void displayEquation(int P,int Q, int number){ this.P = P; this.Q = Q; this.number = number; repaint(); } public void paint(Graphics g){ int x = 20 ; int y = 20 ; int step = 20; int value = 0; g.setColor(Color.white); g.fillRect(2,2,width-3,height-3); g.setColor(Color.black); for(int i = 0; i<=number ; i++){ value = P - (i*Q); g.drawString(""+P+" = "+i+"("+Q+") + "+value+"",x,y); y = y + step; } g.drawRect(2,2,width-3,height-3); } public Dimension preferredSize(){ return new Dimension(width,height); } public synchronized Dimension minimumSize(){ return new Dimension(width,height); } } class RightCanvas extends Canvas { int width; int height; int count; int P,Q; int P_array[] = new int[20]; int Q_array[] = new int[20]; public RightCanvas (int width,int height){ this.width = width; this.height = height; } public void addStuff(int P_array[],int Q_array[],int count){ this.P_array = P_array; this.Q_array = Q_array; this.count = count; repaint (); } public void paint(Graphics g){ int x = 5; int y = 20; int step = 20; int remainder = 0 ; int devisor = 0 ; g.setColor(Color.white); g.fillRect(2,2,width-5,height-3); g.setColor(Color.black); for(int i = 0;i<=count;i++){ P = P_array[i]; Q = Q_array[i]; if( Q != 0){ remainder = P%Q; devisor = P/Q; } if ( remainder != 0){ g.drawString(""+remainder+" = "+P+" - "+devisor+"("+Q+")",x,y); y = y + step; } } g.drawRect(2,2,width-5,height-3); } public Dimension preferredSize(){ return new Dimension(width,height); } public synchronized Dimension minimumSize(){ return new Dimension(width,height); } } class AnimateCanvas extends Canvas { int P,Q ; int number; int j; int width,height; float vec_x[] = new float[4]; float vec_y[] = new float[4]; boolean frozen = false; int start_x[] = new int[4]; //top_l,top_r,bott_r,bott_l int start_y[] = new int[4]; int end_x[] = new int[4]; int end_y[] = new int[4]; // Double Buffer Stuff Dimension offDimension; Image offImage; Graphics offGraphics; public AnimateCanvas (int width,int height){ super(); this.width = width; this.height = height; } public void slide(int P, int Q){ this.P = P; this.Q = Q; int border = 20; int delay = 1; float boxwidth = 0; float boxheight = 0; float moveright = 0; float movedown = 0 ; int devisor = 1 ; int steps = 150; int remainder = 1; devisor = P/Q; remainder = P%Q; boxwidth = width - ( 2*border); boxheight = ((float)P/(float)Q)*boxwidth; if(boxheight > height - ( 2*border)){ boxwidth = ((height-(2*border))/boxheight * boxwidth) ; boxheight = height-(2*border); } moveright = border + ((width -2*border) - boxwidth)/2; movedown = border + ((height -2*border) - boxheight)/2; start_x[0] = (int)(moveright) ; start_y[0] = (int)(movedown + ((float)devisor * boxwidth)); start_x[1] = (int)(moveright + boxwidth); start_y[1] = (int)(movedown + ((float)devisor * boxwidth)); start_x[2] = (int)(moveright + boxwidth); start_y[2] = (int)(movedown + boxheight); start_x[3] = (int)(moveright ); start_y[3] = (int)(movedown + boxheight); boxwidth = width - ( 2*border); boxheight = ((float)Q/(float)remainder)*boxwidth; if(boxheight > height - ( 2*border)){ boxwidth = ((height-(2*border))/boxheight * boxwidth) ; boxheight = height-(2*border); } moveright = border + ((width -2*border) - boxwidth)/2; movedown = border + ((height -2*border) - boxheight)/2; end_x[0] = (int)(moveright) ; end_y[0] = (int)(movedown ); end_x[1] = (int)(moveright + boxwidth); end_y[1] = (int)(movedown ); end_x[2] = (int)(moveright + boxwidth); end_y[2] = (int)(movedown + boxheight); end_x[3] = (int)(moveright ); end_y[3] = (int)(movedown + boxheight); for(int i = 0 ; i<=4-1;i++){ vec_x[i] = (float)(end_x[(i+1)%4] - start_x[i])/(float)steps; vec_y[i] = (float)(end_y[(i+1)%4] - start_y[i])/(float)steps; } long startTime = System.currentTimeMillis(); for ( j = 0 ; j<= steps ; j++){ startTime = startTime + delay; while(System.currentTimeMillis() < startTime); Graphics g = getGraphics(); update(g); } } public void paint(Graphics g){ update(g); } public void update(Graphics g){ float x[] = new float[4]; float y[] = new float[4]; Polygon poly = new Polygon(); Dimension d = size(); if ( (offGraphics == null) || (d.width != offDimension.width ) || (d.height != offDimension.height ) ){ offDimension = d; offImage = createImage(d.width,d.height); offGraphics = offImage.getGraphics(); } offGraphics.setColor(Color.white); offGraphics.fillRect(0,0,width,height); for(int i = 0;i<=4-1;i++){ x[i] = start_x[i] + ((float)j*vec_x[i] + 1); y[i] = start_y[i] + ((float)j*vec_y[i] + 1); poly.addPoint((int)(x[i]+1),(int)(y[i]+1)); } offGraphics.setColor(Color.blue); offGraphics.fillPolygon(poly); offGraphics.setColor(Color.black); offGraphics.drawRect(2,2,width-3,height-3); g.drawImage(offImage,0,0,this); } public Dimension preferredSize(){ return new Dimension(width,height); } public synchronized Dimension minimumSize(){ return new Dimension(width,height); } } class SubstituePanel extends Panel { int P,Q; int solution = 1; int low = 0; int w_last = 0; int x_last = 0; int y_last = 0; int z_last = 0; int width,height ; int num_x,num_y; Panel cards; String buff[] = new String[6]; Button butt[] = new Button[20]; Button button,cont,restart,down; TextField W_field,Y_field; int W_real; int Y_real; Panel leftSub; BottomCanvas messages; Sub rightSub; int a[] = new int[20]; int b[] = new int[20]; int c[] = new int[20]; int d[] = new int[20]; int f[] = new int[20]; int X_array[] = new int[20]; int Z_array[] = new int[20]; int count = 0; int index = 0; int stage = 0; public SubstituePanel (int width,int height,Panel cards){ super(); this.cards = cards; this.width = width; this.height = height; setLayout(new BorderLayout()); } public void go(int P_array[],int Q_array[],int count,int index ){ this.X_array = X_array; this.Z_array = Z_array; this.count = count ; this.index = index ; int j; int P,Q; Label A; Sub bitPanel; leftSub = new Sub(3*width/4,5*height/6); leftSub.setLayout(new CardLayout()); leftSub.setFont(new Font("Helvetica", Font.PLAIN,14)); rightSub = new Sub(width/4,5*height/6); rightSub.setLayout(new GridLayout(10,1)); messages = new BottomCanvas(width,height/5); messages.setBackground(Color.yellow); messages.setFont(new Font("Helvetica", Font.PLAIN,14)); add("West",leftSub); add("East",rightSub); add("South",messages); messages.messageAdd('F'); f[0] = 1; for(int i = 0;i 0){ if(event.target == butt[index-1]){ for (int i = index - 1; i >= 0; i--) butt[i].disable(); index--; messages.messageAdd('G'); messages.show(); drawALine(a,b,c,d,f,count,index,1); leftSub.show(); return(true); } for( int i = index-2 ; i >= 0 ;i--){ //They clicked the wrong button. if ( event.target == butt[i] ){ messages.messageAdd('I'); return(true); } } } if(event.target == button){ int w, y; String string; try{ string = W_field.getText(); w = Integer.valueOf(string).intValue(); string = Y_field.getText(); y = Integer.valueOf(string).intValue(); } catch (NumberFormatException err){ w = -1; y = -1; } if ( W_real == w && Y_real == y ){ if(index != 0){ messages.messageAdd('F'); drawALine(a,b,c,d,f,count,index,2); for ( int i = 0 ; i <=index -1 ;i++) butt[i].enable(); } if(index == 0){ solution = 1; low = 1; wellDone(w,P,y,Q,low,solution); messages.messageAdd('H'); } return(true); } else{ messages.messageAdd('J'); return(true); } } if ( event.target == cont ){ if ( count == 1 ){ wellDone(1,b[0],c[0],d[0],low,++solution); } if ( count > 1 ){ wellDone(W_real,P,Y_real,Q,low,++solution); } return(true); } if ( event.target == down){ if ( count == 1 ){ wellDone(1,b[0],c[0],d[0],--low,solution); } if ( count > 1 ){ wellDone(W_real,P,Y_real,Q,--low,solution); } return(true); } if ( event.target == restart ){ //Applet a = getAppletContext().getApplet(Euclid); removeAll(); count = 0 ; index = 0 ; ((CardLayout)cards.getLayout()).show(cards,"Start Panel"); return(true); } return(true); } public void wellDone(int w, int P, int y, int Q,int low,int solution){ this.solution = solution; this.low = low; LinePanel linePanel; Panel bitPanel = new Panel(); bitPanel.setLayout(new BorderLayout()); Sub topPanel = new Sub(3*width/4,3*height/12); topPanel.setLayout(new GridLayout(0,1)); topPanel.add(new Label("WELL DONE YOU HAVE SOLVED",Label.CENTER)); topPanel.add(new Label(P+"x + "+Q+"y = 1",Label.CENTER)); topPanel.add(new Label("Your solution is",Label.CENTER)); topPanel.add(new Label(P+"("+w+") + "+Q+"(-"+y+") = 1",Label.CENTER)); bitPanel.add("North",topPanel); Sub bottomPanel = new Sub(3*width/4,7*height/12); bottomPanel.setLayout(new BorderLayout()); bottomPanel.setForeground(Color.blue); Sub L_pan = new Sub(2*width/12,3*height/12); Sub C_pan = new Sub(1*width/12,3*height/12); Sub R_pan = new Sub(6*width/12,3*height/12); L_pan.setLayout(new GridLayout(0,1)); C_pan.setLayout(new GridLayout(0,1)); R_pan.setLayout(new GridLayout(0,1)); L_pan.add(new Label("")); C_pan.add(new Label("")); R_pan.add(new Label("")); L_pan.add(new Label("x",Label.CENTER)); C_pan.add(new Label("y",Label.CENTER)); R_pan.add(new Label("Equation",Label.CENTER)); L_pan.add(new Label("---",Label.CENTER)); C_pan.add(new Label("---",Label.CENTER)); R_pan.add(new Label("---",Label.CENTER)); for (int i = low ; i< solution ;i++){ int one = w - (i * Q); int two = -y + (i * P); if ( i > solution - 8 +low ){ L_pan.add(new Label(one+"",Label.CENTER)); C_pan.add(new Label(two+"",Label.CENTER)); if ( two < 0 ){ Label equ = new Label(P+"("+one+") + "+Q+"("+two+") = 1",Label.CENTER); R_pan.add(equ); } if ( two >= 0 ){ Label equ = new Label(P+"("+one+") + "+Q+"("+two+") = 1",Label.CENTER); R_pan.add(equ); } } } cont = new Button("Up"); down = new Button("Down"); restart = new Button("Restart"); cont.setForeground(Color.black); down.setForeground(Color.black); restart.setForeground(Color.black); cont.setBackground(Color.white); down.setBackground(Color.white); restart.setBackground(Color.white); L_pan.add(cont); C_pan.add(down); R_pan.add(restart); //C_pan.add(new Label("")); //R_pan.add(new Label("")); for ( int i = solution ;i<=8 ; i++){ L_pan.add(new Label("")); C_pan.add(new Label("")); R_pan.add(new Label("")); } bottomPanel.add("West",L_pan); bottomPanel.add("Center",C_pan); bottomPanel.add("East",R_pan); bitPanel.add("South",bottomPanel); leftSub.add("BITSPANEL",bitPanel); ((CardLayout)leftSub.getLayout()).show(leftSub,"BITSPANEL"); } public void drawALine(int a[],int b[],int c[],int d[],int f[],int count,int index,int stage){ this.a = a; this.b = b; this.c = c; this.d = d; this.f = f; this.count = count; this.index = index; this.stage = stage; int w,x,y,z ; w = 1; x = b[count-1]; y = c[count-1]; z = d[count-1]; int which = 0; int last = 0; Panel bitPanel = new Panel(); bitPanel.setLayout(new GridLayout(13,1)); LinePanel linePanel = new LinePanel(); if ( count != 1 ){ if( x==a[count-2] && index == count - 1) which=1; if( z==a[count-2] && index == count - 1) which=2; } linePanel.addWXYZ(w,x,y,z,which ); bitPanel.add(linePanel); w_last = w ; x_last = x ; y_last = y ; z_last = z ; for ( int i = count-2 ; i >= index ; i-- ){ f[i] = 1; if (x_last == a[i]){ which = 1; z = z_last ; if ( z_last == d[i] ){ w = w_last * f[i]; x = b[i]; last = y_last; y = w_last * c[i] + y_last; } } if (z_last == a[i]){ which = 2 ; x = x_last; if ( x_last == d[i]){ last = w_last; w = w_last + y_last*c[i]; z = b[i]; y = y_last*f[i]; } } if ( stage == 1 && i == index){ linePanel = new LinePanel(); linePanel.addWXYXsub(last,w,x,y,z,f[i],b[i],c[i],d[i],which); bitPanel.add(linePanel); linePanel = new LinePanel(); } if ( i != index ) which = 0; if ( i != index || stage == 2){ int newwhich = 0; linePanel = new LinePanel(); if (which == 1) newwhich = 2; if (which == 2) newwhich = 1; linePanel.addWXYZ(w,x,y,z,newwhich); bitPanel.add(linePanel); } if ( index == i && stage == 1){ linePanel = new LinePanel(); linePanel.add(new Label("1 =")); W_field = new TextField("?",3); W_field.setBackground(Color.white); linePanel.add(W_field); linePanel.add(new Label("("+x+") -")); Y_field = new TextField("?",3); Y_field.setBackground(Color.white); linePanel.add(Y_field); linePanel.add(new Label("("+z+")")); button = new Button("Continue"); button.setBackground(Color.white); linePanel.add(button); bitPanel.add(linePanel); W_real = w ; Y_real = y; if ( index == 0 ){ P = x; Q = z; } } w_last = w ; x_last = x ; y_last = y ; z_last = z ; } leftSub.add("BITSPANEL",bitPanel); ((CardLayout)leftSub.getLayout()).show(leftSub,"BITSPANEL"); } public Dimension preferredSize(){ return new Dimension(width,height); } public synchronized Dimension minimumSize(){ return new Dimension(width,height); } } class LinePanel extends Panel { public LinePanel(){ } public void addWXYXsub(int last,int w,int x,int y,int z,int f,int b,int c,int d,int which){ //Label X,Z; add(new Label("1 =")); if ( which == 1 ){ Label W = new Label(""+w,Label.RIGHT); Label X = new Label("("+f+"("+b+") - "+c+"("+d+"))",Label.LEFT); X.setForeground(Color.red); Label Y = new Label("- "+last,Label.RIGHT); Label Z = new Label("("+z+")",Label.LEFT); add(W); add(X); add(Y) ; add(Z); } if ( which == 2 ){ Label W = new Label(""+last,Label.RIGHT); Label X = new Label("("+x+")",Label.LEFT); Label Y = new Label("- "+y,Label.RIGHT); Label Z = new Label("("+f+"("+b+") - "+c+"("+d+"))",Label.LEFT); Z.setForeground(Color.red); add(W); add(X); add(Y) ; add(Z); } //add(W); add(X); add(Y) ; add(Z); } public void addWXYZ(int w,int x, int y, int z,int which){ Label W = new Label(""+w,Label.RIGHT); Label X = new Label("("+x+")",Label.LEFT); if ( which == 1 ) X.setForeground(Color.red); Label Y = new Label(" - "+y,Label.RIGHT); Label Z = new Label("("+z+")",Label.LEFT); if ( which == 2 ) Z.setForeground(Color.red); add(new Label("1 =")); add(W); add(X); add(Y); add(Z); } } class Sub extends Panel { int width,height; public Sub(int width,int height){ this.width = width; this.height = height; //setLayout(new GridLayout(20,2)); } public Dimension preferredSize(){ return new Dimension(width,height); } public synchronized Dimension minimumSize(){ return new Dimension(width,height); } } class Globals{ static final int Width = 500 ; static final int Height = 500 ; } class BottomCanvas extends Canvas { int width; int height; int length = 5; char letter; String buff[] = new String[5]; public BottomCanvas (int width, int height){ this.width = width; this.height = height; } public void messageAdd(char letter){ this.letter = letter ; if ( letter == 'A' ){ buff[0] = "(A) Above you can see a rectangle representing"; buff[1] = "the expression shown in the middle."; buff[2] = "Click on the rectangle to proceed"; length = 3 ; } if ( letter == 'B' ){ buff[0] = "(B) This is the final result with this rectangle"; buff[1] = "It will be useful later so we have."; buff[2] = "made a note of it to the right."; buff[3] = "Click on the rectangle to proceed"; length = 4 ; } if ( letter == 'C' ){ buff[0] = "(C) We now repeat the process. "; buff[1] = "Click on the rectangle to proceed."; length = 2 ; } if ( letter == 'D' ){ buff[0] = "(D) Since we now have a remainder of one we have"; buff[1] = "finished the algorithm and we have obtained all"; buff[2] = "the information in the right column to solve" ; buff[3] = "the problem" ; buff[4] = "Click on the right column to proceed"; length = 5 ; } if ( letter == 'E' ){ buff[0] = "(E) You have just shown that the two numbers"; buff[1] = "you chose have a common prime factor."; buff[2] = "Click the restart button and this time use two co-prime"; buff[3] = "numbers to start the algorithm with."; length = 4 ; } if ( letter == 'F' ){ buff[0] = "(F) On the right are the results you found from the"; buff[1] = "previous section."; buff[2] = "You can replace the value in red brackets by"; buff[3] = "clicking on one of the equations on the right"; length = 4 ; } if ( letter == 'G' ){ buff[0] = "(G) Replace each of the \"?\" with"; buff[1] = "values so the expression is true."; buff[2] = "Simplify the line above to do this."; buff[3] = "Click on Continue."; length = 4 ; } if ( letter == 'H' ){ buff[0] = "(H) Well done. You have solved the problem"; buff[1] = "You can obtain furthur solutions by clicking"; buff[2] = "on up or down."; buff[3] = "Restart to choose different numbers"; length = 3; } if ( letter == 'I' ){ buff[0] ="(I) You selected the wrong button. Try again"; length = 1; } if ( letter == 'J'){ buff[0] = "(J) You entered the wrong numbers." ; buff[1] = "Please try again"; length = 2 ; } repaint(); } public void paint(Graphics g){ int x = 30; int y = 20; int step = 15; g.setColor(Color.black); for(int i = 0 ;i<=length-1;i++){ g.drawString(buff[i],x,y); y = y + step; } g.dispose(); } public Dimension preferredSize(){ return new Dimension(width,height); } public synchronized Dimension minimumSize(){ return new Dimension(width,height); } }