/*******************************************************************************
* This file is part of logisim-evolution.
*
* logisim-evolution 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 3 of the License, or
* (at your option) any later version.
*
* logisim-evolution 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 logisim-evolution. If not, see <http://www.gnu.org/licenses/>.
*
* Original code by Carl Burch (http://www.cburch.com), 2011.
* Subsequent modifications by :
* + Haute École Spécialisée Bernoise
* http://www.bfh.ch
* + Haute École du paysage, d'ingénierie et d'architecture de Genève
* http://hepia.hesge.ch/
* + Haute École d'Ingénierie et de Gestion du Canton de Vaud
* http://www.heig-vd.ch/
* The project is currently maintained by :
* + REDS Institute - HEIG-VD
* Yverdon-les-Bains, Switzerland
* http://reds.heig-vd.ch
*******************************************************************************/
/**
* Based on PUCTools (v0.9 beta) by CRC - PUC - Minas (pucmg.crc at gmail.com)
*/
package com.cburch.logisim.std.wiring;
import java.awt.Color;
import java.awt.Graphics2D;
import com.cburch.logisim.circuit.Wire;
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.WireRepair;
import com.cburch.logisim.tools.WireRepairData;
import com.cburch.logisim.tools.key.BitWidthConfigurator;
import com.cburch.logisim.util.GraphicsUtil;
public class TransmissionGate extends InstanceFactory {
static final int OUTPUT = 0;
static final int INPUT = 1;
static final int GATE0 = 2;
static final int GATE1 = 3;
public TransmissionGate() {
super("Transmission Gate", Strings.getter("transmissionGateComponent"));
setIconName("transmis.gif");
setAttributes(new Attribute[] { StdAttr.FACING, Wiring.ATTR_GATE,
StdAttr.WIDTH }, new Object[] { Direction.EAST,
Wiring.GATE_TOP_LEFT, BitWidth.ONE });
setFacingAttribute(StdAttr.FACING);
setKeyConfigurator(new BitWidthConfigurator(StdAttr.WIDTH));
}
private Value computeOutput(InstanceState state) {
BitWidth width = state.getAttributeValue(StdAttr.WIDTH);
Value input = state.getPortValue(INPUT);
Value gate0 = state.getPortValue(GATE0);
Value gate1 = state.getPortValue(GATE1);
if (gate0.isFullyDefined() && gate1.isFullyDefined() && gate0 != gate1) {
if (gate0 == Value.TRUE) {
return Value.createUnknown(width);
} else {
return input;
}
} else {
if (input.isFullyDefined()) {
return Value.createError(width);
} else {
Value[] v = input.getAll();
for (int i = 0; i < v.length; i++) {
if (v[i] != Value.UNKNOWN) {
v[i] = Value.ERROR;
}
}
return Value.create(v);
}
}
}
@Override
protected void configureNewInstance(Instance instance) {
instance.addAttributeListener();
updatePorts(instance);
}
@Override
public boolean contains(Location loc, AttributeSet attrs) {
if (super.contains(loc, attrs)) {
Direction facing = attrs.getValue(StdAttr.FACING);
Location center = Location.create(0, 0).translate(facing, -20);
return center.manhattanDistanceTo(loc) < 24;
} else {
return false;
}
}
private void drawInstance(InstancePainter painter, boolean isGhost) {
Bounds bds = painter.getBounds();
Object powerLoc = painter.getAttributeValue(Wiring.ATTR_GATE);
Direction facing = painter.getAttributeValue(StdAttr.FACING);
boolean flip = (facing == Direction.SOUTH || facing == Direction.WEST) == (powerLoc == Wiring.GATE_TOP_LEFT);
int degrees = Direction.WEST.toDegrees() - facing.toDegrees();
if (flip)
degrees += 180;
double radians = Math.toRadians((degrees + 360) % 360);
Graphics2D g = (Graphics2D) painter.getGraphics().create();
g.rotate(radians, bds.getX() + 20, bds.getY() + 20);
g.translate(bds.getX(), bds.getY());
GraphicsUtil.switchToWidth(g, Wire.WIDTH);
Color gate0 = g.getColor();
Color gate1 = gate0;
Color input = gate0;
Color output = gate0;
Color platform = gate0;
if (!isGhost && painter.getShowState()) {
gate0 = painter.getPortValue(GATE0).getColor();
gate1 = painter.getPortValue(GATE0).getColor();
input = painter.getPortValue(INPUT).getColor();
output = painter.getPortValue(OUTPUT).getColor();
platform = computeOutput(painter).getColor();
}
g.setColor(flip ? input : output);
g.drawLine(0, 20, 11, 20);
g.drawLine(11, 13, 11, 27);
g.setColor(flip ? output : input);
g.drawLine(29, 20, 40, 20);
g.drawLine(29, 13, 29, 27);
g.setColor(gate0);
g.drawLine(20, 35, 20, 40);
GraphicsUtil.switchToWidth(g, 1);
g.drawOval(18, 30, 4, 4);
g.drawLine(10, 30, 30, 30);
GraphicsUtil.switchToWidth(g, Wire.WIDTH);
g.setColor(gate1);
g.drawLine(20, 9, 20, 0);
GraphicsUtil.switchToWidth(g, 1);
g.drawLine(10, 10, 30, 10);
g.setColor(platform);
g.drawLine(9, 12, 31, 12);
g.drawLine(9, 28, 31, 28);
if (flip) { // arrow
g.drawLine(18, 17, 21, 20);
g.drawLine(18, 23, 21, 20);
} else {
g.drawLine(22, 17, 19, 20);
g.drawLine(22, 23, 19, 20);
}
g.dispose();
}
@Override
public Object getInstanceFeature(final Instance instance, Object key) {
if (key == WireRepair.class) {
return new WireRepair() {
public boolean shouldRepairWire(WireRepairData data) {
return true;
}
};
}
return super.getInstanceFeature(instance, key);
}
@Override
public Bounds getOffsetBounds(AttributeSet attrs) {
Direction facing = attrs.getValue(StdAttr.FACING);
return Bounds.create(0, -20, 40, 40).rotate(Direction.WEST, facing, 0,
0);
}
@Override
protected void instanceAttributeChanged(Instance instance, Attribute<?> attr) {
if (attr == StdAttr.FACING || attr == Wiring.ATTR_GATE) {
instance.recomputeBounds();
updatePorts(instance);
} else if (attr == StdAttr.WIDTH) {
instance.fireInvalidated();
}
}
@Override
public void paintGhost(InstancePainter painter) {
drawInstance(painter, true);
}
@Override
public void paintInstance(InstancePainter painter) {
drawInstance(painter, false);
painter.drawPorts();
}
@Override
public void propagate(InstanceState state) {
state.setPort(OUTPUT, computeOutput(state), 1);
}
private void updatePorts(Instance instance) {
int dx = 0;
int dy = 0;
Direction facing = instance.getAttributeValue(StdAttr.FACING);
if (facing == Direction.NORTH) {
dy = 1;
} else if (facing == Direction.EAST) {
dx = -1;
} else if (facing == Direction.SOUTH) {
dy = -1;
} else if (facing == Direction.WEST) {
dx = 1;
}
Object powerLoc = instance.getAttributeValue(Wiring.ATTR_GATE);
boolean flip = (facing == Direction.SOUTH || facing == Direction.WEST) == (powerLoc == Wiring.GATE_TOP_LEFT);
Port[] ports = new Port[4];
ports[OUTPUT] = new Port(0, 0, Port.OUTPUT, StdAttr.WIDTH);
ports[INPUT] = new Port(40 * dx, 40 * dy, Port.INPUT, StdAttr.WIDTH);
if (flip) {
ports[GATE1] = new Port(20 * (dx - dy), 20 * (dx + dy), Port.INPUT,
1);
ports[GATE0] = new Port(20 * (dx + dy), 20 * (-dx + dy),
Port.INPUT, 1);
} else {
ports[GATE0] = new Port(20 * (dx - dy), 20 * (dx + dy), Port.INPUT,
1);
ports[GATE1] = new Port(20 * (dx + dy), 20 * (-dx + dy),
Port.INPUT, 1);
}
instance.setPorts(ports);
}
}