/* Copyright (c) 2010, Carl Burch. License information is located in the
* com.cburch.logisim.Main source code and at www.cburch.com/logisim/. */
package com.cburch.logisim.std.gates;
import java.awt.Graphics;
import com.cburch.logisim.analyze.model.Expression;
import com.cburch.logisim.analyze.model.Expressions;
import com.cburch.logisim.data.Value;
import com.cburch.logisim.instance.InstancePainter;
import com.cburch.logisim.instance.InstanceState;
import com.cburch.logisim.util.GraphicsUtil;
class NandGate extends AbstractGate {
public static NandGate FACTORY = new NandGate();
private NandGate() {
super("NAND Gate", Strings.getter("nandGateComponent"));
setNegateOutput(true);
setRectangularLabel(AndGate.FACTORY.getRectangularLabel(null));
setIconNames("nandGate.gif", "nandGateRect.gif", "dinNandGate.gif");
}
@Override
public void paintIconShaped(InstancePainter painter) {
Graphics g = painter.getGraphics();
int[] xp = new int[] { 8, 0, 0, 8 };
int[] yp = new int[] { 2, 2, 18, 18 };
g.drawPolyline(xp, yp, 4);
GraphicsUtil.drawCenteredArc(g, 8, 10, 8, -90, 180);
g.drawOval(16, 8, 4, 4);
}
@Override
protected void paintShape(InstancePainter painter, int width, int height) {
PainterShaped.paintAnd(painter, width, height);
}
@Override
protected void paintDinShape(InstancePainter painter, int width, int height,
int inputs) {
PainterDin.paintAnd(painter, width, height, true);
}
@Override
protected Value computeOutput(Value[] inputs, int numInputs,
InstanceState state) {
return GateFunctions.computeAnd(inputs, numInputs).not();
}
@Override
protected Expression computeExpression(Expression[] inputs, int numInputs) {
Expression ret = inputs[0];
for (int i = 1; i < numInputs; i++) {
ret = Expressions.and(ret, inputs[i]);
}
return Expressions.not(ret);
}
@Override
protected Value getIdentity() { return Value.TRUE; }
}