CurrentElm.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 CurrentElm extends CircuitElm {
	double currentValue;
	public CurrentElm(int xx, int yy) {
	    super(xx, yy);
	    currentValue = .01;
	}
	public CurrentElm(int xa, int ya, int xb, int yb, int f,
		   StringTokenizer st) {
	    super(xa, ya, xb, yb, f);
	    try {
		currentValue = new Double(st.nextToken()).doubleValue();
	    } catch (Exception e) {
		currentValue = .01;
	    }
	}
	String dump() {
	    return super.dump() + " " + currentValue;
	}
	int getDumpType() { return 'i'; }
	
	Polygon arrow;
	Point ashaft1, ashaft2, center;
	void setPoints() {
	    super.setPoints();
	    calcLeads(26);
	    ashaft1 = interpPoint(lead1, lead2, .25);
	    ashaft2 = interpPoint(lead1, lead2, .6);
	    center = interpPoint(lead1, lead2, .5);
	    Point p2 = interpPoint(lead1, lead2, .75);
	    arrow = calcArrow(center, p2, 4, 4);
	}
	void draw(Graphics g) {
	    int cr = 12;
	    draw2Leads(g);
	    setVoltageColor(g, (volts[0]+volts[1])/2);
	    setPowerColor(g, false);
	    
	    drawThickCircle(g, center.x, center.y, cr);
	    drawThickLine(g, ashaft1, ashaft2);

	    g.fillPolygon(arrow);
	    setBbox(point1, point2, cr);
	    doDots(g);
	    if (sim.showValuesCheckItem.getState()) {
		String s = getShortUnitText(currentValue, "A");
		if (dx == 0 || dy == 0)
		    drawValues(g, s, cr);
	    }
	    drawPosts(g);
	}
	
	// we defer stamping current sources until we can tell if they have a current path or not
	void stampCurrentSource(boolean broken) {
	    if (broken) {
		// no current path; stamping a current source would cause a matrix error.
		sim.stampResistor(nodes[0], nodes[1], 1e8);
		current = 0;
	    } else {
		// ok to stamp a current source
		sim.stampCurrentSource(nodes[0], nodes[1], currentValue);
		current = currentValue;
	    }
	}
	
	public EditInfo getEditInfo(int n) {
	    if (n == 0)
		return new EditInfo("Current (A)", currentValue, 0, .1);
	    return null;
	}
	public void setEditValue(int n, EditInfo ei) {
	    currentValue = ei.value;
	}
	void getInfo(String arr[]) {
	    arr[0] = "current source";
	    getBasicInfo(arr);
	}
	double getVoltageDiff() {
	    return volts[1] - volts[0];
	}
    }