InverterElm.java

/*    
    Copyright (C) Paul Falstad and Iain Sharp
    
    This file is part of CircuitJS1.

    CircuitJS1 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
    (at your option) any later version.

    CircuitJS1 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 CircuitJS1.  If not, see <http://www.gnu.org/licenses/>.
*/

package com.lushprojects.circuitjs1.client;

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

    class InverterElm extends CircuitElm {
	double slewRate; // V/ns
	double highVoltage;
	public InverterElm(int xx, int yy) {
	    super(xx, yy);
	    noDiagonal = true;
	    slewRate = .5;
	    
	    // copy defaults from last gate edited
	    highVoltage = GateElm.lastHighVoltage;
	}
	public InverterElm(int xa, int ya, int xb, int yb, int f,
			      StringTokenizer st) {
	    super(xa, ya, xb, yb, f);
	    noDiagonal = true;
	    slewRate = .5;
	    highVoltage = 5;
	    try {
		slewRate = new Double (st.nextToken()).doubleValue();
		highVoltage = new Double (st.nextToken()).doubleValue();
	    } catch (Exception e) {
	    }
	}
	String dump() {
	    return super.dump() + " " + slewRate + " " + highVoltage;
	}
	
	int getDumpType() { return 'I'; }
	void draw(Graphics g) {
	    drawPosts(g);
	    draw2Leads(g);
	    g.setColor(needsHighlight() ? selectColor : lightGrayColor);
	    drawThickPolygon(g, gatePoly);
	    drawThickCircle(g, pcircle.x, pcircle.y, 3);
	    curcount = updateDotCount(current, curcount);
	    drawDots(g, lead2, point2, curcount);
	}
	Polygon gatePoly;
	Point pcircle;
	void setPoints() {
	    super.setPoints();
	    int hs = 16;
	    int ww = 16;
	    if (ww > dn/2)
		ww = (int) (dn/2);
	    lead1 = interpPoint(point1, point2, .5-ww/dn);
	    lead2 = interpPoint(point1, point2, .5+(ww+2)/dn);
	    pcircle = interpPoint(point1, point2, .5+(ww-2)/dn);
	    Point triPoints[] = newPointArray(3);
	    interpPoint2(lead1, lead2, triPoints[0], triPoints[1], 0, hs);
	    triPoints[2] = interpPoint(point1, point2, .5+(ww-5)/dn);
	    gatePoly = createPolygon(triPoints);
	    setBbox(point1, point2, hs);
	}
	int getVoltageSourceCount() { return 1; }
	void stamp() {
	    sim.stampVoltageSource(0, nodes[1], voltSource);
	}
	void doStep() {
	    double v0 = volts[1];
	    double out = volts[0] > highVoltage*.5 ? 0 : highVoltage;
	    double maxStep = slewRate * sim.timeStep * 1e9;
	    out = Math.max(Math.min(v0+maxStep, out), v0-maxStep);
	    sim.updateVoltageSource(0, nodes[1], voltSource, out);
	}
	double getVoltageDiff() { return volts[0]; }
	void getInfo(String arr[]) {
	    arr[0] = "inverter";
	    arr[1] = "Vi = " + getVoltageText(volts[0]);
	    arr[2] = "Vo = " + getVoltageText(volts[1]);
	}
	public EditInfo getEditInfo(int n) {
	    if (n == 0)
		return new EditInfo("Slew Rate (V/ns)", slewRate, 0, 0);
	    if (n == 1)
		return new EditInfo("High Voltage (V)", highVoltage, 1, 10);
	    return null;
	}
	public void setEditValue(int n, EditInfo ei) {
	    if (n == 0)
		slewRate = ei.value;
	    if (n == 1)
		highVoltage = GateElm.lastHighVoltage = ei.value;
	}
	// there is no current path through the inverter input, but there
	// is an indirect path through the output to ground.
	boolean getConnection(int n1, int n2) { return false; }
	boolean hasGroundConnection(int n1) {
	    return (n1 == 1);
	}
	int getShortcut() { return '1'; }
	
	@Override double getCurrentIntoPoint(int xa, int ya) {
	    if (xa == x2 && ya == y2)
		return current;
	    return 0;
	}

    }