/* 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.plexers;
import java.awt.Color;
import java.awt.Graphics;
import com.cburch.logisim.LogisimVersion;
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.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.tools.key.JoinedConfigurator;
import com.cburch.logisim.util.GraphicsUtil;
public class Multiplexer extends InstanceFactory {
public Multiplexer() {
super("Multiplexer", Strings.getter("multiplexerComponent"));
setAttributes(new Attribute[] {
StdAttr.FACING, Plexers.ATTR_SELECT_LOC, Plexers.ATTR_SELECT, StdAttr.WIDTH,
Plexers.ATTR_DISABLED, Plexers.ATTR_ENABLE
}, new Object[] {
Direction.EAST, Plexers.SELECT_BOTTOM_LEFT, Plexers.DEFAULT_SELECT, BitWidth.ONE,
Plexers.DISABLED_FLOATING, Boolean.TRUE
});
setKeyConfigurator(JoinedConfigurator.create(
new BitWidthConfigurator(Plexers.ATTR_SELECT, 1, 5, 0),
new BitWidthConfigurator(StdAttr.WIDTH)));
setIconName("multiplexer.gif");
setFacingAttribute(StdAttr.FACING);
}
@Override
public Object getDefaultAttributeValue(Attribute<?> attr, LogisimVersion ver) {
if (attr == Plexers.ATTR_ENABLE) {
int newer = ver.compareTo(LogisimVersion.get(2, 6, 3, 220));
return Boolean.valueOf(newer >= 0);
} else {
return super.getDefaultAttributeValue(attr, ver);
}
}
@Override
public Bounds getOffsetBounds(AttributeSet attrs) {
Direction dir = attrs.getValue(StdAttr.FACING);
BitWidth select = attrs.getValue(Plexers.ATTR_SELECT);
int inputs = 1 << select.getWidth();
if (inputs == 2) {
return Bounds.create(-30, -20, 30, 40).rotate(Direction.EAST, dir, 0, 0);
} else {
int offs = -(inputs / 2) * 10 - 10;
int length = inputs * 10 + 20;
return Bounds.create(-40, offs, 40, length).rotate(Direction.EAST, dir, 0, 0);
}
}
@Override
public boolean contains(Location loc, AttributeSet attrs) {
Direction facing = attrs.getValue(StdAttr.FACING);
return Plexers.contains(loc, getOffsetBounds(attrs), facing);
}
@Override
protected void configureNewInstance(Instance instance) {
instance.addAttributeListener();
updatePorts(instance);
}
@Override
protected void instanceAttributeChanged(Instance instance, Attribute<?> attr) {
if (attr == StdAttr.FACING || attr == Plexers.ATTR_SELECT_LOC
|| attr == Plexers.ATTR_SELECT) {
instance.recomputeBounds();
updatePorts(instance);
} else if (attr == StdAttr.WIDTH || attr == Plexers.ATTR_ENABLE) {
updatePorts(instance);
} else if (attr == Plexers.ATTR_DISABLED) {
instance.fireInvalidated();
}
}
private void updatePorts(Instance instance) {
Direction dir = instance.getAttributeValue(StdAttr.FACING);
Object selectLoc = instance.getAttributeValue(Plexers.ATTR_SELECT_LOC);
BitWidth data = instance.getAttributeValue(StdAttr.WIDTH);
BitWidth select = instance.getAttributeValue(Plexers.ATTR_SELECT);
boolean enable = instance.getAttributeValue(Plexers.ATTR_ENABLE).booleanValue();
int selMult = selectLoc == Plexers.SELECT_BOTTOM_LEFT ? 1 : -1;
int inputs = 1 << select.getWidth();
Port[] ps = new Port[inputs + (enable ? 3 : 2)];
Location sel;
if (inputs == 2) {
Location end0;
Location end1;
if (dir == Direction.WEST) {
end0 = Location.create(30, -10);
end1 = Location.create(30, 10);
sel = Location.create(20, selMult * 20);
} else if (dir == Direction.NORTH) {
end0 = Location.create(-10, 30);
end1 = Location.create( 10, 30);
sel = Location.create(selMult * -20, 20);
} else if (dir == Direction.SOUTH) {
end0 = Location.create(-10, -30);
end1 = Location.create( 10, -30);
sel = Location.create(selMult * -20, -20);
} else {
end0 = Location.create(-30, -10);
end1 = Location.create(-30, 10);
sel = Location.create(-20, selMult * 20);
}
ps[0] = new Port(end0.getX(), end0.getY(), Port.INPUT, data.getWidth());
ps[1] = new Port(end1.getX(), end1.getY(), Port.INPUT, data.getWidth());
} else {
int dx = -(inputs / 2) * 10;
int ddx = 10;
int dy = -(inputs / 2) * 10;
int ddy = 10;
if (dir == Direction.WEST) {
dx = 40; ddx = 0;
sel = Location.create(20, selMult * (dy + 10 * inputs));
} else if (dir == Direction.NORTH) {
dy = 40; ddy = 0;
sel = Location.create(selMult * dx, 20);
} else if (dir == Direction.SOUTH) {
dy = -40; ddy = 0;
sel = Location.create(selMult * dx, -20);
} else {
dx = -40; ddx = 0;
sel = Location.create(-20, selMult * (dy + 10 * inputs));
}
for (int i = 0; i < inputs; i++) {
ps[i] = new Port(dx, dy, Port.INPUT, data.getWidth());
dx += ddx;
dy += ddy;
}
}
Location en = sel.translate(dir, 10);
ps[inputs] = new Port(sel.getX(), sel.getY(), Port.INPUT, select.getWidth());
if (enable) {
ps[inputs + 1] = new Port(en.getX(), en.getY(), Port.INPUT, BitWidth.ONE);
}
ps[ps.length - 1] = new Port(0, 0, Port.OUTPUT, data.getWidth());
for (int i = 0; i < inputs; i++) {
ps[i].setToolTip(Strings.getter("multiplexerInTip", "" + i));
}
ps[inputs].setToolTip(Strings.getter("multiplexerSelectTip"));
if (enable) {
ps[inputs + 1].setToolTip(Strings.getter("multiplexerEnableTip"));
}
ps[ps.length - 1].setToolTip(Strings.getter("multiplexerOutTip"));
instance.setPorts(ps);
}
@Override
public void propagate(InstanceState state) {
BitWidth data = state.getAttributeValue(StdAttr.WIDTH);
BitWidth select = state.getAttributeValue(Plexers.ATTR_SELECT);
boolean enable = state.getAttributeValue(Plexers.ATTR_ENABLE).booleanValue();
int inputs = 1 << select.getWidth();
Value en = enable ? state.getPort(inputs + 1) : Value.TRUE;
Value out;
if (en == Value.FALSE) {
Object opt = state.getAttributeValue(Plexers.ATTR_DISABLED);
Value base = opt == Plexers.DISABLED_ZERO ? Value.FALSE : Value.UNKNOWN;
out = Value.repeat(base, data.getWidth());
} else if (en == Value.ERROR && state.isPortConnected(inputs + 1)) {
out = Value.createError(data);
} else {
Value sel = state.getPort(inputs);
if (sel.isFullyDefined()) {
out = state.getPort(sel.toIntValue());
} else if (sel.isErrorValue()) {
out = Value.createError(data);
} else {
out = Value.createUnknown(data);
}
}
state.setPort(inputs + (enable ? 2 : 1), out, Plexers.DELAY);
}
@Override
public void paintGhost(InstancePainter painter) {
Direction facing = painter.getAttributeValue(StdAttr.FACING);
BitWidth select = painter.getAttributeValue(Plexers.ATTR_SELECT);
Plexers.drawTrapezoid(painter.getGraphics(), painter.getBounds(),
facing, select.getWidth() == 1 ? 10 : 20);
}
@Override
public void paintInstance(InstancePainter painter) {
Graphics g = painter.getGraphics();
Bounds bds = painter.getBounds();
Direction facing = painter.getAttributeValue(StdAttr.FACING);
BitWidth select = painter.getAttributeValue(Plexers.ATTR_SELECT);
boolean enable = painter.getAttributeValue(Plexers.ATTR_ENABLE).booleanValue();
int inputs = 1 << select.getWidth();
// draw stubs for select/enable inputs that aren't on instance boundary
GraphicsUtil.switchToWidth(g, 3);
boolean vertical = facing != Direction.NORTH && facing != Direction.SOUTH;
Object selectLoc = painter.getAttributeValue(Plexers.ATTR_SELECT_LOC);
int selMult = selectLoc == Plexers.SELECT_BOTTOM_LEFT ? 1 : -1;
int dx = vertical ? 0 : -selMult;
int dy = vertical ? selMult : 0;
if (inputs == 2) { // draw select wire
Location pt = painter.getInstance().getPortLocation(inputs);
if (painter.getShowState()) {
g.setColor(painter.getPort(inputs).getColor());
}
g.drawLine(pt.getX() - 2 * dx, pt.getY() - 2 * dy,
pt.getX(), pt.getY());
}
if (enable) {
Location en = painter.getInstance().getPortLocation(inputs + 1);
if (painter.getShowState()) {
g.setColor(painter.getPort(inputs + 1).getColor());
}
int len = inputs == 2 ? 6 : 4;
g.drawLine(en.getX() - len * dx, en.getY() - len * dy,
en.getX(), en.getY());
}
GraphicsUtil.switchToWidth(g, 1);
// draw a circle indicating where the select input is located
Multiplexer.drawSelectCircle(g, bds, painter.getInstance().getPortLocation(inputs));
// draw a 0 indicating where the numbering starts for inputs
int x0;
int y0;
int halign;
if (facing == Direction.WEST) {
x0 = bds.getX() + bds.getWidth() - 3;
y0 = bds.getY() + 15;
halign = GraphicsUtil.H_RIGHT;
} else if (facing == Direction.NORTH) {
x0 = bds.getX() + 10;
y0 = bds.getY() + bds.getHeight() - 2;
halign = GraphicsUtil.H_CENTER;
} else if (facing == Direction.SOUTH) {
x0 = bds.getX() + 10;
y0 = bds.getY() + 12;
halign = GraphicsUtil.H_CENTER;
} else {
x0 = bds.getX() + 3;
y0 = bds.getY() + 15;
halign = GraphicsUtil.H_LEFT;
}
g.setColor(Color.GRAY);
GraphicsUtil.drawText(g, "0", x0, y0, halign, GraphicsUtil.V_BASELINE);
// draw the trapezoid, "MUX" string, the individual ports
g.setColor(Color.BLACK);
Plexers.drawTrapezoid(g, bds, facing, select.getWidth() == 1 ? 10 : 20);
GraphicsUtil.drawCenteredText(g, "MUX",
bds.getX() + bds.getWidth() / 2,
bds.getY() + bds.getHeight() / 2);
painter.drawPorts();
}
static void drawSelectCircle(Graphics g, Bounds bds, Location loc) {
int locDelta = Math.max(bds.getHeight(), bds.getWidth()) <= 50 ? 8 : 6;
Location circLoc;
if (bds.getHeight() >= bds.getWidth()) { // vertically oriented
if (loc.getY() < bds.getY() + bds.getHeight() / 2) { // at top
circLoc = loc.translate(0, locDelta);
} else { // at bottom
circLoc = loc.translate(0, -locDelta);
}
} else {
if (loc.getX() < bds.getX() + bds.getWidth() / 2) { // at left
circLoc = loc.translate(locDelta, 0);
} else { // at right
circLoc = loc.translate(-locDelta, 0);
}
}
g.setColor(Color.LIGHT_GRAY);
g.fillOval(circLoc.getX() - 3, circLoc.getY() - 3, 6, 6);
}
}