/* 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.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.util.Map;
import com.cburch.logisim.analyze.model.Expression;
import com.cburch.logisim.circuit.ExpressionComputer;
import com.cburch.logisim.data.Attribute;
import com.cburch.logisim.data.AttributeSet;
import com.cburch.logisim.data.BitWidth;
import com.cburch.logisim.data.Bounds;
import com.cburch.logisim.data.Direction;
import com.cburch.logisim.data.Location;
import com.cburch.logisim.data.Value;
import com.cburch.logisim.file.Options;
import com.cburch.logisim.instance.Instance;
import com.cburch.logisim.instance.InstanceFactory;
import com.cburch.logisim.instance.InstancePainter;
import com.cburch.logisim.instance.InstanceState;
import com.cburch.logisim.instance.Port;
import com.cburch.logisim.instance.StdAttr;
import com.cburch.logisim.tools.key.BitWidthConfigurator;
import com.cburch.logisim.util.GraphicsUtil;
import com.cburch.logisim.util.Icons;
class Buffer extends InstanceFactory {
public static InstanceFactory FACTORY = new Buffer();
private Buffer() {
super("Buffer", Strings.getter("bufferComponent"));
setAttributes(new Attribute[] { StdAttr.FACING, StdAttr.WIDTH,
GateAttributes.ATTR_OUTPUT, StdAttr.LABEL, StdAttr.LABEL_FONT },
new Object[] { Direction.EAST, BitWidth.ONE,
GateAttributes.OUTPUT_01, "", StdAttr.DEFAULT_LABEL_FONT });
setIcon(Icons.getIcon("bufferGate.gif"));
setFacingAttribute(StdAttr.FACING);
setKeyConfigurator(new BitWidthConfigurator(StdAttr.WIDTH));
setPorts(new Port[] {
new Port(0, 0, Port.OUTPUT, StdAttr.WIDTH),
new Port(0, -20, Port.INPUT, StdAttr.WIDTH),
});
}
@Override
public Bounds getOffsetBounds(AttributeSet attrs) {
Direction facing = attrs.getValue(StdAttr.FACING);
if (facing == Direction.SOUTH) return Bounds.create(-9, -20, 18, 20);
if (facing == Direction.NORTH) return Bounds.create(-9, 0, 18, 20);
if (facing == Direction.WEST) return Bounds.create(0, -9, 20, 18);
return Bounds.create(-20, -9, 20, 18);
}
@Override
public void propagate(InstanceState state) {
Value in = state.getPort(1);
in = Buffer.repair(state, in);
state.setPort(0, in, GateAttributes.DELAY);
}
//
// methods for instances
//
@Override
protected void configureNewInstance(Instance instance) {
configurePorts(instance);
instance.addAttributeListener();
NotGate.configureLabel(instance, false, null);
}
@Override
protected void instanceAttributeChanged(Instance instance, Attribute<?> attr) {
if (attr == StdAttr.FACING) {
instance.recomputeBounds();
configurePorts(instance);
NotGate.configureLabel(instance, false, null);
}
}
private void configurePorts(Instance instance) {
Direction facing = instance.getAttributeValue(StdAttr.FACING);
Port[] ports = new Port[2];
ports[0] = new Port(0, 0, Port.OUTPUT, StdAttr.WIDTH);
Location out = Location.create(0, 0).translate(facing, -20);
ports[1] = new Port(out.getX(), out.getY(), Port.INPUT, StdAttr.WIDTH);
instance.setPorts(ports);
}
@Override
public Object getInstanceFeature(final Instance instance, Object key) {
if (key == ExpressionComputer.class) {
return new ExpressionComputer() {
public void computeExpression(Map<Location,Expression> expressionMap) {
Expression e = expressionMap.get(instance.getPortLocation(1));
if (e != null) {
expressionMap.put(instance.getPortLocation(0), e);
}
}
};
}
return super.getInstanceFeature(instance, key);
}
//
// painting methods
//
@Override
public void paintGhost(InstancePainter painter) {
paintBase(painter);
}
@Override
public void paintInstance(InstancePainter painter) {
Graphics g = painter.getGraphics();
g.setColor(Color.BLACK);
paintBase(painter);
painter.drawPorts();
painter.drawLabel();
}
private void paintBase(InstancePainter painter) {
Direction facing = painter.getAttributeValue(StdAttr.FACING);
Location loc = painter.getLocation();
int x = loc.getX();
int y = loc.getY();
Graphics g = painter.getGraphics();
g.translate(x, y);
double rotate = 0.0;
if (facing != Direction.EAST && g instanceof Graphics2D) {
rotate = -facing.toRadians();
((Graphics2D) g).rotate(rotate);
}
GraphicsUtil.switchToWidth(g, 2);
int[] xp = new int[4];
int[] yp = new int[4];
xp[0] = 0; yp[0] = 0;
xp[1] = -19; yp[1] = -7;
xp[2] = -19; yp[2] = 7;
xp[3] = 0; yp[3] = 0;
g.drawPolyline(xp, yp, 4);
if (rotate != 0.0) {
((Graphics2D) g).rotate(-rotate);
}
g.translate(-x, -y);
}
//
// static methods - shared with other classes
//
static Value repair(InstanceState state, Value v) {
AttributeSet opts = state.getProject().getOptions().getAttributeSet();
Object onUndefined = opts.getValue(Options.ATTR_GATE_UNDEFINED);
boolean errorIfUndefined = onUndefined.equals(Options.GATE_UNDEFINED_ERROR);
Value repaired;
if (errorIfUndefined) {
int vw = v.getWidth();
BitWidth w = state.getAttributeValue(StdAttr.WIDTH);
int ww = w.getWidth();
if (vw == ww && v.isFullyDefined()) return v;
Value[] vs = new Value[w.getWidth()];
for (int i = 0; i < vs.length; i++) {
Value ini = i < vw ? v.get(i) : Value.ERROR;
vs[i] = ini.isFullyDefined() ? ini : Value.ERROR;
}
repaired = Value.create(vs);
} else {
repaired = v;
}
Object outType = state.getAttributeValue(GateAttributes.ATTR_OUTPUT);
return AbstractGate.pullOutput(repaired, outType);
}
}