RailElm.java

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

class RailElm extends VoltageElm {
    public RailElm(int xx, int yy) { super(xx, yy, WF_DC); }
    RailElm(int xx, int yy, int wf) { super(xx, yy, wf); }
    public RailElm(int xa, int ya, int xb, int yb, int f,
		   StringTokenizer st) {
	super(xa, ya, xb, yb, f, st);
    }
    final int FLAG_CLOCK = 1;
    int getDumpType() { return 'R'; }
    int getPostCount() { return 1; }
	
    void setPoints() {
	super.setPoints();
	lead1 = interpPoint(point1, point2, 1-circleSize/dn);
    }
    void draw(Graphics g) {
	setBbox(point1, point2, circleSize);
	setVoltageColor(g, volts[0]);
	drawThickLine(g, point1, lead1);
	boolean clock = waveform == WF_SQUARE && (flags & FLAG_CLOCK) != 0;
	if (waveform == WF_DC || waveform == WF_VAR || clock) {
	    Font f = new Font("SansSerif", 0, 12);
	    g.setFont(f);
	    g.setColor(needsHighlight() ? selectColor : whiteColor);
	    setPowerColor(g, false);
	    double v = getVoltage();
	    String s = getShortUnitText(v, "V");
	    if (Math.abs(v) < 1)
		s = showFormat.format(v) + "V";
	    if (getVoltage() > 0)
		s = "+" + s;
	    if (this instanceof AntennaElm)
		s = "Ant";
	    if (clock)
		s = "CLK";
	    drawCenteredText(g, s, x2, y2, true);
	} else {
	    drawWaveform(g, point2);
	}
	drawPosts(g);
	curcount = updateDotCount(-current, curcount);
	if (sim.dragElm != this)
	    drawDots(g, point1, lead1, curcount);
    }
    double getVoltageDiff() { return volts[0]; }
    void stamp() {
	if (waveform == WF_DC)
	    sim.stampVoltageSource(0, nodes[0], voltSource, getVoltage());
	else
	    sim.stampVoltageSource(0, nodes[0], voltSource);
    }
    void doStep() {
	if (waveform != WF_DC)
	    sim.updateVoltageSource(0, nodes[0], voltSource, getVoltage());
    }
    boolean hasGroundConnection(int n1) { return true; }
    int getShortcut() { return 'V'; }
}