/* 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.gray;
import java.net.URL;
import javax.swing.ImageIcon;
import com.cburch.logisim.data.Attribute;
import com.cburch.logisim.data.BitWidth;
import com.cburch.logisim.data.Bounds;
import com.cburch.logisim.data.Direction;
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.util.GraphicsUtil;
import com.cburch.logisim.util.StringUtil;
/** Manufactures a counter that iterates over Gray codes. This demonstrates
* several additional features beyond the SimpleGrayCounter class. */
class GrayCounter extends InstanceFactory {
public GrayCounter() {
super("Gray Counter");
setOffsetBounds(Bounds.create(-30, -15, 30, 30));
setPorts(new Port[] {
new Port(-30, 0, Port.INPUT, 1),
new Port( 0, 0, Port.OUTPUT, StdAttr.WIDTH),
});
// We'll have width, label, and label font attributes. The latter two
// attributes allow us to associate a label with the component (though
// we'll also need configureNewInstance to configure the label's
// location).
setAttributes(
new Attribute[] { StdAttr.WIDTH, StdAttr.LABEL, StdAttr.LABEL_FONT },
new Object[] { BitWidth.create(4), "", StdAttr.DEFAULT_LABEL_FONT });
// The following method invocation sets things up so that the instance's
// state can be manipulated using the Poke Tool.
setInstancePoker(CounterPoker.class);
// These next two lines set it up so that the explorer window shows a
// customized icon representing the component type. This should be a
// 16x16 image.
URL url = getClass().getClassLoader().getResource("com/cburch/gray/counter.gif");
if (url != null) setIcon(new ImageIcon(url));
}
/** The configureNewInstance method is invoked every time a new instance
* is created. In the superclass, the method doesn't do anything, since
* the new instance is pretty thoroughly configured already by default. But
* sometimes you need to do something particular to each instance, so you
* would override the method. In this case, we need to set up the location
* for its label. */
@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) {
// This is the same as with SimpleGrayCounter, except that we use the
// StdAttr.WIDTH attribute to determine the bit width to work with.
BitWidth width = state.getAttributeValue(StdAttr.WIDTH);
CounterData cur = CounterData.get(state, width);
boolean trigger = cur.updateClock(state.getPort(0));
if (trigger) cur.setValue(GrayIncrementer.nextGray(cur.getValue()));
state.setPort(1, cur.getValue(), 9);
}
@Override
public void paintInstance(InstancePainter painter) {
// This is essentially the same as with SimpleGrayCounter, except for
// the invocation of painter.drawLabel to make the label be drawn.
painter.drawBounds();
painter.drawClock(0, Direction.EAST);
painter.drawPort(1);
painter.drawLabel();
if (painter.getShowState()) {
BitWidth width = painter.getAttributeValue(StdAttr.WIDTH);
CounterData state = CounterData.get(painter, width);
Bounds bds = painter.getBounds();
GraphicsUtil.drawCenteredText(painter.getGraphics(),
StringUtil.toHexString(width.getWidth(), state.getValue().toIntValue()),
bds.getX() + bds.getWidth() / 2,
bds.getY() + bds.getHeight() / 2);
}
}
}