//GraphCanvas.java
/* A Java class for
 * TwoWire.java
 * Electromagnetic Transmission Line Applet
 * Applet without Smith Chart - Prepared by Umberto Ravaioli 
 * for 6th edition of Fundamentals of Applied Electromagnetics Book
 * May 2009 - All Rights Reserved
 */   

import java.awt.*;

public class GraphCanvas extends Canvas{
    protected static final Color bgcolor = new Color(216,216,191);
    
    protected Image im;
    protected Graphics buf;
    protected int LeftMargin = 40;
    protected int TopSep = 40;
    protected int BottomSep = 40;
    protected int RightMargin = 40;
    protected int VPos=0;
    protected String XLabel, YLabel, ZLabel, TITLE;
    protected String X1, X2, X3, X1_mil, X2_mil;
    protected String Y1, Y2, Y3;
    protected int NumPoints;
    protected double x[];
    protected double y[];
    protected double ymin, ymax;
    protected double xmin, xmax;
    protected int xx[];
    protected int yy[];
    protected double xRef;
    protected boolean Should_Plot_Zero_Line;
    protected boolean Should_Plot_Ref_Point;
    protected boolean MilsLabel;
    protected boolean IsYRangeMinSet, IsYRangeMaxSet;
    protected boolean IsXRangeMinSet, IsXRangeMaxSet;
    protected boolean IsWZero;

    Font font1, font2; // = new Font("SanSerif",Font.PLAIN,11);
    //public static Font font1;
    public double sfactor;
    
    public GraphCanvas(){
	super();
	setBackground(bgcolor);
        
        XLabel="x-axis";
	YLabel="y-axis";
	TITLE ="Unknown Title";
	Y1 = " ";
	Y2 = " ";
	Y3 = " ";
	X1 = " ";
	X2 = " ";
	X1_mil = " ";
	X2_mil = " ";
	X3 = " ";
	NumPoints = 1001;
	x = new double[NumPoints];
	y = new double[NumPoints];
	xx = new int[NumPoints];
	yy = new int[NumPoints];
	for(int i=0;i<NumPoints;i++){
	    x[i]=i;
	    y[i]=0.0;
	}
        
        IsYRangeMinSet=false;
	IsYRangeMaxSet=false;
	IsXRangeMinSet=false;
	IsXRangeMaxSet=false;
	IsWZero = false;
	
	xRef = 0.0;
	
	Should_Plot_Zero_Line = false;
	Should_Plot_Ref_Point = false;
	MilsLabel = false;
    }
     
public void paint(Graphics g){
    if(im == null){
	im = createImage(getSize().width,getSize().height);
	buf = im.getGraphics();
	drawGraph(buf);
    }
    drawGraph(buf);
    g.drawImage(im,0,0,null);
}

//Addition to reduce flicker new routine
public void update(Graphics g){		// added to avoid clearing
	paint(g);
}

public void drawGraph(Graphics g){
	g.clearRect(0,0,getSize().width,getSize().height);
    	drawAxis(g);
	if(Should_Plot_Zero_Line){plotZeroLine(g);}
        g.setColor(Color.black);
	g.draw3DRect(0,0,getSize().width-1,getSize().height-1,false);
        
        LeftMargin = (int)Math.ceil(sfactor*45);
        TopSep = (int)Math.ceil(sfactor*40);
        BottomSep = (int)Math.ceil(sfactor*40);
        RightMargin = (int)Math.ceil(sfactor*35);
        
	font1 = new Font("SanSerif",Font.PLAIN,(int)Math.ceil(sfactor*11));
        font2 = new Font("Serif",Font.PLAIN,(int)Math.ceil(sfactor*12));
        
	drawTitle(g);
        drawTitle(g); // Print again or smoothed fonts are washed out on dark
        plotPoints(g);
	plotRefPoint(g);
}

protected void ignition(){
    int height=getSize().height;
    int width=getSize().width;
    if(!IsYRangeMinSet){ymin = MaestroA.getMin(y);}
    if(!IsYRangeMaxSet){ymax = MaestroA.getMax(y);}
    if(!IsXRangeMaxSet){xmax = x[x.length-1];}
    if(!IsXRangeMinSet){xmin = x[0];}
    if(IsYRangeMinSet || IsYRangeMaxSet){
	MaestroA.confiner(y,ymax,ymin);
    }
    if(IsXRangeMinSet || IsXRangeMaxSet){
	MaestroA.confiner(x,xmax,xmin);
    }
    
    if(ymin==ymax){ymax=2*ymin+1;}
    for(int i=0;i<xx.length;i++){
	xx[i]= (int)MaestroA.mapper(x[i],(double)(width-RightMargin),(double)(LeftMargin),xmax,xmin);
	yy[i]= (int)MaestroA.mapper(y[i],(double)TopSep,(double)(height-BottomSep),ymax,ymin);
    } 
    
    X1=""+MaestroA.rounder(x[0],3);
    X2=""+MaestroA.rounder(x[x.length-1],3);
    X1_mil=""+MaestroA.rounder(x[0]/0.0254,3);
    X2_mil=""+MaestroA.rounder(x[x.length-1]/0.0254,3);
    X3="|";
    Y1=""+MaestroA.rounder(ymin,3);
    if(ymax < 1.0e230){
	Y2=""+MaestroA.rounder(ymax,3);
    }
    else{
	Y2="\u221e";
    }
    Y3="_";
    
}

protected void plotZeroLine(Graphics g){
    if(ymin*ymax>0){return;}
    FontMetrics fm = g.getFontMetrics();
    g.setFont(font1);
    int yy;
    yy = (int)MaestroA.mapper(0.0,(double)TopSep,(double)(getSize().height-BottomSep),ymax,ymin);
    g.setColor(Color.red);
    g.drawLine(LeftMargin,yy,getSize().width-RightMargin,yy);
    g.drawString("0",LeftMargin-fm.stringWidth("0"),yy+fm.getHeight()/3);
}

public synchronized void plotZeroLine(boolean Should_Plot_Zero_Line){
    this.Should_Plot_Zero_Line = Should_Plot_Zero_Line;
}

protected void plotRefPoint(Graphics g){
    int myX=0, myY=0, i;
    
    Graphics2D g2d = (Graphics2D)g;
    g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
    
    i = (int)(NumPoints*(xRef-x[0])/(x[x.length-1]-x[0]));
    if(i<0) {i = 0;}
    if(i>=NumPoints){i=NumPoints-1;}
    myX = (int)MaestroA.mapper(xRef,(double)(getSize().width-RightMargin),(double)(LeftMargin),xmax,xmin);
    if(y[i]>0.0){
	myY = (int)MaestroA.mapper(y[i],(double)TopSep,(double)(getSize().height-BottomSep),ymax,ymin);
    }
    else{
	myY =getSize().height-BottomSep ;
    }
    
    g.setColor(Color.white);
    g.drawLine(myX,myY,myX,getSize().height-BottomSep+5);
    
    g.setColor(Color.red);
    MaestroG.fillCircle(myX,myY,(int)Math.ceil(sfactor*6),g);
    g.setColor(Color.white);
    MaestroG.drawCircle(myX,myY,(int)Math.ceil(sfactor*6),g);
    g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_OFF);
}

public synchronized void plotRefPoint(boolean Should_Plot_Ref_Point){
    this.Should_Plot_Ref_Point = Should_Plot_Ref_Point;
}

protected void plotPoints(Graphics g){
    ignition();
    g.setColor(Color.yellow);
    g.drawPolyline(xx,yy,xx.length);
}

protected void drawTitle(Graphics g){
    Graphics2D g2d = (Graphics2D)g;
    g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
    
    FontMetrics fm = g.getFontMetrics();
    g.setFont(font1);
    g.setColor(Color.white);
    g.drawString(XLabel,(getSize().width-fm.stringWidth(XLabel))/2,
			 getSize().height-BottomSep+3*fm.getHeight()/2-(int)Math.ceil(sfactor*3));
    g.setColor(Color.white);
    g.drawString(TITLE,(getSize().width-fm.stringWidth(TITLE))/2+(int)Math.ceil(sfactor*5),TopSep/2);
    
    g.setColor(Color.yellow);
    g.drawString(X1,LeftMargin-(int)Math.ceil(sfactor*6),getSize().height-BottomSep+3*fm.getHeight()/2);
    g.drawString(X2,getSize().width-RightMargin-fm.stringWidth(X2)+15,getSize().height-BottomSep+3*fm.getHeight()/2);
    //g.drawString(X3,getSize().width-RightMargin,getSize().height-BottomSep+(int)Math.ceil(sfactor*5));
    g.drawString(Y1,Math.max(4,LeftMargin-fm.stringWidth(Y1))-(int)Math.ceil(sfactor*7),getSize().height-BottomSep+(int)Math.ceil(sfactor*5));
    g.drawLine(getSize().width-RightMargin,getSize().height-BottomSep+(int)Math.ceil(sfactor*5),
               getSize().width-RightMargin,getSize().height-BottomSep);
    if(IsWZero){
	MaestroG.subscripterInfinityThree("","","","","",g,(int)Math.ceil(sfactor*11),(int)Math.ceil(sfactor*13),TopSep+(int)Math.ceil(sfactor*4));
        //g.setFont(new Font("SanSerif",Font.PLAIN,11));
        g.setFont(font1);
        g.drawLine((int)Math.ceil(sfactor*22),TopSep-(int)Math.ceil(sfactor*6),(int)Math.ceil(sfactor*22),TopSep-(int)Math.ceil(sfactor*16));
	MaestroG.drawArrowScaled((int)Math.ceil(sfactor*22),TopSep-(int)Math.ceil(sfactor*16),1,sfactor,g);   
    }
    else{
	g.drawString(Y2,Math.max(4,LeftMargin-fm.stringWidth(Y2))-(int)Math.ceil(sfactor*7),TopSep+(int)Math.ceil(sfactor*4));
    }
    
    g.drawString(Y3,LeftMargin-(int)Math.ceil(sfactor*6),TopSep-(int)Math.ceil(sfactor*1));
   
    g.setColor(Color.white);
    //MaestroG.subscripter("Z","0","",g,(int)Math.ceil(sfactor*11),LeftMargin-(int)Math.ceil(sfactor*22),getSize().height/2-(int)Math.ceil(sfactor*10));
    MaestroG.subscripter("Z","0","",g,(int)Math.ceil(sfactor*12),LeftMargin-(int)Math.ceil(sfactor*25),getSize().height/2-(int)Math.ceil(sfactor*10));
    
    g.setFont(font1);

    //MaestroG.subscripterSanSym("[","","\u03a9","]",g,(int)Math.ceil(sfactor*11),LeftMargin-(int)Math.ceil(sfactor*25),getSize().height/2+(int)Math.ceil(sfactor*15));
    g.setFont(font2);
    g.drawString("[ \u03a9 ]",(int)Math.ceil(sfactor*10),(int)Math.ceil(sfactor*120));
    g.setFont(font1);
    
    g.setFont(font1);
    g.setColor(Color.black);
}

protected void drawAxis(Graphics g){
    VPos = getSize().height-BottomSep;
    g.setColor(Color.white);
    //Vertical Axis
    g.drawLine(LeftMargin,TopSep/2,LeftMargin,getSize().height-BottomSep+(int)Math.ceil(sfactor*5));
    MaestroG.drawArrowScaled(LeftMargin,TopSep/2,1,sfactor,g);
    //Horizontal Axis
    g.drawLine(LeftMargin-(int)Math.ceil(sfactor*5),VPos,getSize().width-RightMargin+(int)Math.ceil(sfactor*10),VPos);
    MaestroG.drawArrowScaled(getSize().width-RightMargin+(int)Math.ceil(sfactor*10),VPos,3,sfactor,g);
}

public final synchronized void setXLabel(String XLabel){
    this.XLabel=XLabel;
}

public final synchronized void setYLabel(String YLabel){
    this.YLabel=YLabel;
} 

public final synchronized void setTitle(String TITLE){
    this.TITLE = TITLE;
}

public void setWZero(boolean IsWZero){
    this.IsWZero = IsWZero;
}

public final synchronized void setLabels(String TITLE, String YLabel, String XLabel, String ZLabel){
    this.TITLE=TITLE;
    this.YLabel = YLabel;
    this.XLabel = XLabel;
    this.ZLabel = ZLabel;
}
 
public void plot(double[] xdata, double[] ydata){
    if(NumPoints != xdata.length){
	NumPoints = xdata.length;
	x = new double[NumPoints];
	y = new double[NumPoints];
	xx = new int[NumPoints];
	yy = new int[NumPoints];
    }
    for(int i = 0; i < NumPoints; i++){
	x[i] = xdata[i];
	y[i] = ydata[i];
    }
    repaint();
}

public void setYRange(double ymax, double ymin){
    IsYRangeMaxSet=true;
    IsYRangeMinSet=true;
    this.ymax=ymax;
    this.ymin=ymin;
}

public void setYRangeMin(double ymin){
    IsYRangeMinSet=true;
    this.ymin=ymin;
}

public void setYRangeMax(double ymax){
    IsYRangeMaxSet=true;
    this.ymax=ymax;
}

public void setLabelAxis(boolean MilsLabel){
    this.MilsLabel = MilsLabel;
}

public void setAuto(){
    IsYRangeMaxSet=false;
    IsYRangeMinSet=false;
    IsXRangeMaxSet=false;
    IsXRangeMinSet=false;
}

public synchronized void setRefPoint(double xRef){
    this.xRef = xRef;
}

public synchronized void setScaling(double sfactor){
	this.sfactor = sfactor;
}    

}