AnalogSwitchElm.java

import java.awt.*;
import java.util.StringTokenizer;

class AnalogSwitchElm extends CircuitElm {
    final int FLAG_INVERT = 1;
    double resistance, r_on, r_off;
    public AnalogSwitchElm(int xx, int yy) {
	super(xx, yy);
	r_on = 20;
	r_off = 1e10;
    }
    public AnalogSwitchElm(int xa, int ya, int xb, int yb, int f,
			   StringTokenizer st) {
	super(xa, ya, xb, yb, f);
	r_on = 20;
	r_off = 1e10;
	try {
	    r_on = new Double(st.nextToken()).doubleValue();
	    r_off = new Double(st.nextToken()).doubleValue();
	} catch (Exception e) { }
	
    }
    String dump() {
	return super.dump() + " " + r_on + " " + r_off;
    }
    
    int getDumpType() { return 159; }
    boolean open;
	
    Point ps, point3, lead3;
    void setPoints() {
	super.setPoints();
	calcLeads(32);
	ps = new Point();
	int openhs = 16;
	point3 = interpPoint(point1, point2, .5, -openhs);
	lead3  = interpPoint(point1, point2, .5, -openhs/2);
    }
	
    void draw(Graphics g) {
	int openhs = 16;
	int hs = (open) ? openhs : 0;
	setBbox(point1, point2, openhs);

	draw2Leads(g);
	    
	g.setColor(lightGrayColor);
	interpPoint(lead1, lead2, ps, 1, hs);
	drawThickLine(g, lead1, ps);

	setVoltageColor(g, volts[2]);
	drawThickLine(g, point3, lead3);
	    
	if (!open)
	    doDots(g);
	drawPosts(g);
    }
    void calculateCurrent() {
	current = (volts[0]-volts[1])/resistance;
    }
	
    // we need this to be able to change the matrix for each step
    boolean nonLinear() { return true; }

    void stamp() {
	sim.stampNonLinear(nodes[0]);
	sim.stampNonLinear(nodes[1]);
    }
    void doStep() {
	open = (volts[2] < 2.5);
	if ((flags & FLAG_INVERT) != 0)
	    open = !open;
	resistance = (open) ? r_off : r_on;
	sim.stampResistor(nodes[0], nodes[1], resistance);
    }
    void drag(int xx, int yy) {
	xx = sim.snapGrid(xx);
	yy = sim.snapGrid(yy);
	if (abs(x-xx) < abs(y-yy))
	    xx = x;
	else
	    yy = y;
	int q1 = abs(x-xx)+abs(y-yy);
	int q2 = (q1/2) % sim.gridSize;
	if (q2 != 0)
	    return;
	x2 = xx; y2 = yy;
	setPoints();
    }
    int getPostCount() { return 3; }
    Point getPost(int n) {
	return (n == 0) ? point1 : (n == 1) ? point2 : point3;
    }
    void getInfo(String arr[]) {
	arr[0] = "analog switch";
	arr[1] = open ? "open" : "closed";
	arr[2] = "Vd = " + getVoltageDText(getVoltageDiff());
	arr[3] = "I = " + getCurrentDText(getCurrent());
	arr[4] = "Vc = " + getVoltageText(volts[2]);
    }
    // we have to just assume current will flow either way, even though that
    // might cause singular matrix errors
    boolean getConnection(int n1, int n2) {
	if (n1 == 2 || n2 == 2)
	    return false;
	return true;
    }
    public EditInfo getEditInfo(int n) {
	if (n == 0) {
	    EditInfo ei = new EditInfo("", 0, -1, -1);
	    ei.checkbox = new Checkbox("Normally closed",
				       (flags & FLAG_INVERT) != 0);
	    return ei;
	}
	if (n == 1)
	    return new EditInfo("On Resistance (ohms)", r_on, 0, 0);
	if (n == 2)
	    return new EditInfo("Off Resistance (ohms)", r_off, 0, 0);
	return null;
    }
    public void setEditValue(int n, EditInfo ei) {
	if (n == 0)
	    flags = (ei.checkbox.getState()) ?
		(flags | FLAG_INVERT) :
		(flags & ~FLAG_INVERT);
	if (n == 1 && ei.value > 0)
	    r_on = ei.value;
	if (n == 2 && ei.value > 0)
	    r_off = ei.value;
    }
}