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FMElm.java
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FMElm.java
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import java.awt.*;
import java.util.StringTokenizer;
// contributed by Edward Calver
class FMElm extends CircuitElm {
static final int FLAG_COS = 2;
double carrierfreq,signalfreq, maxVoltage, freqTimeZero,deviation;
double lasttime=0;
double funcx=0;
public FMElm(int xx, int yy) {
super(xx, yy);
deviation=200;
maxVoltage = 5;
carrierfreq =800;
signalfreq=40;
reset();
}
public FMElm(int xa, int ya, int xb, int yb, int f,
StringTokenizer st) {
super(xa, ya, xb, yb, f);
carrierfreq = new Double(st.nextToken()).doubleValue();
signalfreq= new Double(st.nextToken()).doubleValue();
maxVoltage = new Double(st.nextToken()).doubleValue();
deviation = new Double(st.nextToken()).doubleValue();
if ((flags & FLAG_COS) != 0) {
flags &= ~FLAG_COS;
}
reset();
}
int getDumpType() { return 201; }
String dump() {
return super.dump() + " " +carrierfreq+" " + signalfreq + " " +maxVoltage + " " +deviation;
}
/*void setCurrent(double c) {
current = c;
System.out.print("v current set to " + c + "\n");
}*/
void reset() {
freqTimeZero = 0;
curcount = 0;
}
int getPostCount() { return 1; }
void stamp() {
sim.stampVoltageSource(0, nodes[0], voltSource);
}
void doStep() {
sim.updateVoltageSource(0, nodes[0], voltSource, getVoltage());
}
double getVoltage() {
double deltaT=sim.t-lasttime;
lasttime=sim.t;
double signalamplitude=Math.sin((2*pi*(sim.t-freqTimeZero))*signalfreq);
funcx+=deltaT*(carrierfreq+(signalamplitude*deviation));
double w = 2*pi*funcx;
return Math.sin(w)*maxVoltage;
}
final int circleSize = 17;
void draw(Graphics g) {
setBbox(point1, point2, circleSize);
setVoltageColor(g, volts[0]);
drawThickLine(g, point1, lead1);
Font f = new Font("SansSerif", 0, 12);
g.setFont(f);
g.setColor(needsHighlight() ? selectColor : whiteColor);
setPowerColor(g, false);
double v = getVoltage();
String s = "FM";
drawCenteredText(g, s, x2, y2, true);
drawWaveform(g, point2);
drawPosts(g);
curcount = updateDotCount(-current, curcount);
if (sim.dragElm != this)
drawDots(g, point1, lead1, curcount);
}
void drawWaveform(Graphics g, Point center) {
g.setColor(needsHighlight() ? selectColor : Color.gray);
setPowerColor(g, false);
int xc = center.x; int yc = center.y;
drawThickCircle(g, xc, yc, circleSize);
int wl = 8;
adjustBbox(xc-circleSize, yc-circleSize,
xc+circleSize, yc+circleSize);
}
void setPoints() {
super.setPoints();
lead1 = interpPoint(point1, point2, 1-circleSize/dn);
}
double getVoltageDiff() { return volts[0]; }
boolean hasGroundConnection(int n1) { return true; }
int getVoltageSourceCount() {
return 1;
}
double getPower() { return -getVoltageDiff()*current; }
void getInfo(String arr[]) {
arr[0] = "FM Source";
arr[1] = "I = " + getCurrentText(getCurrent());
arr[2] = "V = " +
getVoltageText(getVoltageDiff());
arr[3] = "cf = " + getUnitText(carrierfreq, "Hz");
arr[4] = "sf = " + getUnitText(signalfreq, "Hz");
arr[5]= "dev =" + getUnitText(deviation, "Hz");
arr[6] = "Vmax = " + getVoltageText(maxVoltage);
}
public EditInfo getEditInfo(int n) {
if (n == 0)
return new EditInfo("Max Voltage", maxVoltage, -20, 20);
if (n == 1)
return new EditInfo("Carrier Frequency (Hz)", carrierfreq, 4, 500);
if (n == 2)
return new EditInfo("Signal Frequency (Hz)", signalfreq, 4, 500);
if (n == 3)
return new EditInfo("Deviation (Hz)", deviation, 4, 500);
return null;
}
public void setEditValue(int n, EditInfo ei) {
if (n == 0)
maxVoltage = ei.value;
if (n == 1)
carrierfreq = ei.value;
if (n == 2)
signalfreq=ei.value;
if (n == 3)
deviation=ei.value;
}
}