JfetElm.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 JfetElm extends MosfetElm {
	JfetElm(int xx, int yy, boolean pnpflag) {
	    super(xx, yy, pnpflag);
	    noDiagonal = true;
	}
	public JfetElm(int xa, int ya, int xb, int yb, int f,
		       StringTokenizer st) {
	    super(xa, ya, xb, yb, f, st);
	    noDiagonal = true;
	}
	
	Polygon gatePoly;
	Polygon arrowPoly;
	Point gatePt;

	void draw(Graphics g) {
	    setBbox(point1, point2, hs);
	    setVoltageColor(g, volts[1]);
	    drawThickLine(g, src[0], src[1]);
	    drawThickLine(g, src[1], src[2]);
	    setVoltageColor(g, volts[2]);
	    drawThickLine(g, drn[0], drn[1]);
	    drawThickLine(g, drn[1], drn[2]);
	    setVoltageColor(g, volts[0]);
	    drawThickLine(g, point1, gatePt);
	    g.fillPolygon(arrowPoly);
	    setPowerColor(g, true);
	    g.fillPolygon(gatePoly);
	    curcount = updateDotCount(-ids, curcount);
	    if (curcount != 0) {
		drawDots(g, src[0], src[1], curcount);
		drawDots(g, src[1], src[2], curcount+8);
		drawDots(g, drn[0], drn[1], -curcount);
		drawDots(g, drn[1], drn[2], -(curcount+8));
	    }
	    drawPosts(g);
	}
	void setPoints() {
	    super.setPoints();

	    // find the coordinates of the various points we need to draw
	    // the JFET.
	    int hs2 = hs*dsign;
	    src = newPointArray(3);
	    drn = newPointArray(3);
	    interpPoint2(point1, point2, src[0], drn[0], 1, -hs2);
	    interpPoint2(point1, point2, src[1], drn[1], 1, -hs2/2);
	    interpPoint2(point1, point2, src[2], drn[2], 1-10/dn, -hs2/2);

	    gatePt = interpPoint(point1, point2, 1-14/dn);

	    Point ra[] = newPointArray(4);
	    interpPoint2(point1, point2, ra[0], ra[1], 1-13/dn, hs);
	    interpPoint2(point1, point2, ra[2], ra[3], 1-10/dn, hs);
	    gatePoly = createPolygon(ra[0], ra[1], ra[3], ra[2]);
	    if (pnp == -1) {
		Point x = interpPoint(gatePt, point1, 18/dn);
		arrowPoly = calcArrow(gatePt, x, 8, 3);
	    } else
		arrowPoly = calcArrow(point1, gatePt, 8, 3);
	}
	int getDumpType() { return 'j'; }
	// these values are taken from Hayes+Horowitz p155
	double getDefaultThreshold() { return -4; }
	double getDefaultBeta() { return .00125; }
	void getInfo(String arr[]) {
	    getFetInfo(arr, "JFET");
	}
	@Override String getScopeText(int v) { 
	    return sim.LS(((pnp == -1) ? "p-" : "n-") + "JFET");
	}
    }