/* -*- tab-width: 4 -*-
*
* Electric(tm) VLSI Design System
*
* File: ViaStack.java
*
* Copyright (c) 2003 Sun Microsystems and Static Free Software
*
* Electric(tm) 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.
*
* Electric(tm) 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 Electric(tm); see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, Mass 02111-1307, USA.
*/
package com.sun.electric.tool.generator.layout;
import com.sun.electric.database.EditingPreferences;
import com.sun.electric.database.hierarchy.Cell;
import com.sun.electric.database.prototype.NodeProto;
import com.sun.electric.database.topology.NodeInst;
import com.sun.electric.database.topology.PortInst;
import com.sun.electric.technology.ArcProto;
import com.sun.electric.technology.PrimitiveNode;
class ViaStack {
// ------------------------------private data -----------------------------
private PortInst port1, port2;
private final TechType tech;
// ---------------------------- private methods --------------------------
private void swap() {
PortInst tp = port1;
port1 = port2;
port2 = tp;
}
private void buildStack(int hLo, int hHi, double x, double y, double width,
double height, Cell f) {
PortInst viaBelow = null;
for (int h=hLo; h<hHi; h++) {
PrimitiveNode via = tech.viaAbove(h);
// Don't let via width or height drop below minimum required for
// 1 cut.
double wid = Math.max(width, LayoutLib.getNodeProtoWidth(via));
double hei = Math.max(height, LayoutLib.getNodeProtoHeight(via));
PortInst viaAbove = LayoutLib.newNodeInst(via, x, y, wid, hei, 0,
f).getOnlyPortInst();
if (viaBelow == null) {
// First via in stack
port1 = viaAbove;
} else {
// connect to lower via
LayoutLib.newArcInst(tech.layerAtHeight(h), 1, viaBelow,
viaAbove);
}
port2 = viaAbove;
viaBelow = viaAbove;
}
}
// ----------------------------- public methods --------------------------
// square vias
public ViaStack(ArcProto arc1, ArcProto arc2, double x, double y,
double width, TechType tech, Cell f) {
this(arc1, arc2, x, y, width, width, tech, f);
}
// rectangular vias
public ViaStack(ArcProto arc1, ArcProto arc2, double x, double y,
double width, double height, TechType tech, Cell f) {
this.tech = tech;
int h1 = tech.layerHeight(arc1);
int h2 = tech.layerHeight(arc2);
int deltaZ = h2 - h1;
if (arc1==arc2) {
EditingPreferences ep = f.getEditingPreferences();
NodeProto pin = arc1.findOverridablePinProto(ep);
double defSz = LayoutLib.DEF_SIZE;
NodeInst pinInst = LayoutLib.newNodeInst(pin,x,y,defSz,defSz,0,f);
port1 = port2 = pinInst.getOnlyPortInst();
} else if (deltaZ>0) {
// arc2 higher than arc1
buildStack(h1, h2, x, y, width, height, f);
} else {
buildStack(h2, h1, x, y, width, height, f);
swap();
}
}
public PortInst getPort1() {return port1;}
public PortInst getPort2() {return port2;}
public double getCenterX() {return port1.getCenter().getX() /*LayoutLib.roundCenterX(port1)*/;}
public double getCenterY() {return port1.getCenter().getY() /*LayoutLib.roundCenterY(port1)*/;}
}