Package com.cburch.logisim.std.memory

Source Code of com.cburch.logisim.std.memory.Random$StateData

/* 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.memory;

import java.awt.Graphics;

import com.cburch.logisim.data.Attribute;
import com.cburch.logisim.data.Attributes;
import com.cburch.logisim.data.BitWidth;
import com.cburch.logisim.data.Bounds;
import com.cburch.logisim.data.Direction;
import com.cburch.logisim.data.Value;
import com.cburch.logisim.instance.Instance;
import com.cburch.logisim.instance.InstanceData;
import com.cburch.logisim.instance.InstanceFactory;
import com.cburch.logisim.instance.InstanceLogger;
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.StringUtil;

public class Random extends InstanceFactory {
  private static final Attribute<Integer> ATTR_SEED
    = Attributes.forInteger("seed", Strings.getter("randomSeedAttr"));
 
  private static final int OUT = 0;
  private static final int CK  = 1;
  private static final int NXT = 2;
  private static final int RST = 3;

  public Random() {
    super("Random", Strings.getter("randomComponent"));
    setAttributes(new Attribute[] {
        StdAttr.WIDTH, ATTR_SEED, StdAttr.EDGE_TRIGGER,
        StdAttr.LABEL, StdAttr.LABEL_FONT
      }, new Object[] {
        BitWidth.create(8), Integer.valueOf(0), StdAttr.TRIG_RISING,
        "", StdAttr.DEFAULT_LABEL_FONT
      });
    setKeyConfigurator(new BitWidthConfigurator(StdAttr.WIDTH));

    setOffsetBounds(Bounds.create(-30, -20, 30, 40));
    setIconName("random.gif");
    setInstanceLogger(Logger.class);
   
    Port[] ps = new Port[4];
    ps[OUT] = new Port0,   0, Port.OUTPUT, StdAttr.WIDTH);
    ps[CK= new Port(-30, -10, Port.INPUT, 1);
    ps[NXT] = new Port(-3010, Port.INPUT, 1);
    ps[RST] = new Port(-2020, Port.INPUT, 1);
    ps[OUT].setToolTip(Strings.getter("randomQTip"));
    ps[CK].setToolTip(Strings.getter("randomClockTip"));
    ps[NXT].setToolTip(Strings.getter("randomNextTip"));
    ps[RST].setToolTip(Strings.getter("randomResetTip"));
    setPorts(ps);
  }
 
  @Override
  protected void configureNewInstance(Instance instance) {
    Bounds bds = instance.getBounds();
    instance.setTextField(StdAttr.LABEL, StdAttr.LABEL_FONT,
        bds.getX() + bds.getWidth() / 2, bds.getY() - 3,
        GraphicsUtil.H_CENTER, GraphicsUtil.V_BASELINE);
  }

  @Override
  public void propagate(InstanceState state) {
    StateData data = (StateData) state.getData();
    if (data == null) {
      data = new StateData(state.getAttributeValue(ATTR_SEED));
      state.setData(data);
    }

    BitWidth dataWidth = state.getAttributeValue(StdAttr.WIDTH);
    Object triggerType = state.getAttributeValue(StdAttr.EDGE_TRIGGER);
    boolean triggered = data.updateClock(state.getPort(CK), triggerType);

    if (state.getPort(RST) == Value.TRUE) {
      data.reset(state.getAttributeValue(ATTR_SEED));
    } else if (triggered && state.getPort(NXT) != Value.FALSE) {
      data.step();
    }

    state.setPort(OUT, Value.createKnown(dataWidth, data.value), 4);
  }

  @Override
  public void paintInstance(InstancePainter painter) {
    Graphics g = painter.getGraphics();
    Bounds bds = painter.getBounds();
    StateData state = (StateData) painter.getData();
    BitWidth widthVal = painter.getAttributeValue(StdAttr.WIDTH);
    int width = widthVal == null ? 8 : widthVal.getWidth();

    // draw boundary, label
    painter.drawBounds();
    painter.drawLabel();

    // draw input and output ports
    painter.drawPort(OUT, "Q", Direction.WEST);
    painter.drawPort(RST);
    painter.drawPort(NXT);
    painter.drawClock(CK, Direction.EAST);

    // draw contents
    if (painter.getShowState()) {
      int val = state == null ? 0 : state.value;
      String str = StringUtil.toHexString(width, val);
      if (str.length() <= 4) {
        GraphicsUtil.drawText(g, str,
            bds.getX() + 15, bds.getY() + 4,
            GraphicsUtil.H_CENTER, GraphicsUtil.V_TOP);
      } else {
        int split = str.length() - 4;
        GraphicsUtil.drawText(g, str.substring(0, split),
            bds.getX() + 15, bds.getY() + 3,
            GraphicsUtil.H_CENTER, GraphicsUtil.V_TOP);
        GraphicsUtil.drawText(g, str.substring(split),
            bds.getX() + 15, bds.getY() + 15,
            GraphicsUtil.H_CENTER, GraphicsUtil.V_TOP);
      }
    }
  }
 
  private static class StateData extends ClockState implements InstanceData {
    private final static long multiplier = 0x5DEECE66DL;
    private final static long addend = 0xBL;
    private final static long mask = (1L << 48) - 1;

    private long initSeed;
    private long curSeed;
    private int value;
 
    public StateData(Object seed) {
      reset(seed);
    }
   
    void reset(Object seed) {
      long start = seed instanceof Integer ? ((Integer) seed).intValue() : 0;
      if (start == 0) {
        // Prior to 2.7.0, this would reset to the seed at the time of
        // the StateData's creation. It seems more likely that what
        // would be intended was starting a new sequence entirely...
        start = (System.currentTimeMillis() ^ multiplier) & mask;
        if (start == initSeed) {
          start = (start + multiplier) & mask;
        }
      }
      this.initSeed = start;
      this.curSeed = start;
      this.value = (int) start;
    }
   
    void step() {
      long v = curSeed;
      v = (v * multiplier + addend) & mask;
      curSeed = v;
      value = (int) (v >> 12);
    }
  }
 
  public static class Logger extends InstanceLogger {
    @Override
    public String getLogName(InstanceState state, Object option) {
      String ret = state.getAttributeValue(StdAttr.LABEL);
      return ret != null && !ret.equals("") ? ret : null;
    }
 
    @Override
    public Value getLogValue(InstanceState state, Object option) {
      BitWidth dataWidth = state.getAttributeValue(StdAttr.WIDTH);
      if (dataWidth == null) dataWidth = BitWidth.create(0);
      StateData data = (StateData) state.getData();
      if (data == null) return Value.createKnown(dataWidth, 0);
      return Value.createKnown(dataWidth, data.value);
    }
  }
}
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