123 lines
3.3 KiB
Java
123 lines
3.3 KiB
Java
/*
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CoordDecor.java
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*
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* Copyright (c) 2000, Ted Nelson and Tuomas Lukka
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*
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* You may use and distribute under the terms of either the GNU Lesser
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* General Public License, either version 2 of the license or,
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* at your choice, any later version. Alternatively, you may use and
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* distribute under the terms of the XPL.
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*
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* See the LICENSE.lgpl and LICENSE.xpl files for the specific terms of
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* the licenses.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the README
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* file for more details.
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*
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*/
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/*
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* Written by Tuomas Lukka
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*/
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package org.gzigzag;
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import java.awt.*;
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import java.awt.event.*;
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import java.util.*;
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/** A base class from which to derive fast decorations with coordinates.
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*/
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abstract public class CoordDecor extends Renderable {
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public static final String rcsid = "$Id: CoordDecor.java,v 1.7 2000/12/26 20:15:14 bfallenstein Exp $";
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public static boolean dbg = false;
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static void p(String s) { if(dbg) System.out.println(s); }
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static void pa(String s) { System.out.println(s); }
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/** The number of coordinates.
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*/
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int n;
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/** The coordinates.
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* Note: the translate() method assumes that at each even index there's
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* an x coordinate, and at each odd index there's an y coordinate. If
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* that's not true, override translate() in subclasses (possibly returning
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* false, if the coords can't be translated).
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*/
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int[] coords;
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/** A simple class that knows how to efficiently build
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* these things. The efficiency comes from always allocating
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* an array and never letting go of it; adding the arrays to the
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* flob when they're full and starting fresh.
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*/
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static abstract public class Builder {
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/** The flobset the finished products go into. */
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FlobSet into;
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/** The depth of the finished product. */
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int d;
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/** The nth object being rendered. */
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int nth;
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/** The current point index. */
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int curp;
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/** The number of point coordinates to reserve. */
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int np;
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/** The coordinates. */
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int[] p;
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public Builder(FlobSet into) {
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this.into = into;
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}
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/** Start a set.
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* @param n The estimated number of coordinates to come.
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* @param d The depth of the set now begun.
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*/
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public void startl(int n, int d) {
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if(curp != 0) endl();
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this.d = d;
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curp = 0;
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np = n;
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p = null;
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}
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/** Make room for n coordinates. */
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protected void makeRoom(int l) {
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if(p!=null && curp + l > p.length)
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endl();
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if(p==null)
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alloc();
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}
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/** Allocate the arrays. */
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protected void alloc() {
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p = new int[np];
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curp = 0;
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nth = 0;
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}
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public void endl() {
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if(p==null) return;
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into.add(create());
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p = null; curp = 0;
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}
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abstract protected Renderable create();
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}
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public CoordDecor(int[] coords, int n, int d) {
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this.coords = coords;
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this.n = n;
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this.d = d;
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if(coords != null && coords.length < n)
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throw new Error("CoordDecor: less length than n!!!");
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}
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abstract public void render(Graphics g);
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public boolean translate(int x, int y) {
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for(int i=0; i<coords.length; i+=2) {
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coords[i] += x;
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if(i+1 < coords.length) coords[i+1] += y;
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}
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return true;
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}
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}
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