143 lines
4.2 KiB
Java
143 lines
4.2 KiB
Java
/*
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Vob.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.util.*;
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import java.awt.*;
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/** A vob or visual object shown on the screen.
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* Vobs are constant read-only objects like Strings.
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* <p>
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* Vobs should be able to render themselves quickly for animations;
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* caching relevant information in this structure is therefore a good idea.
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* <p>
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* The minimal vob implementation simply implements the
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* render(Graphics, int, int, int, int, int) method.
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*/
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public abstract class Vob extends Renderable {
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public static final String rcsid = "$Id: Vob.java,v 1.1 2001/01/20 08:56:19 bfallenstein Exp $";
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public int w, h;
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/** The cell associated with this vob.
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* This may be set to null for things that are - well - just
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* things rendered. But those should be in a minority always.
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*/
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public ZZCell c;
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/** The vob we are interpolating with.
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* Storing it here is a pure speed hack: in reality it'd belong in
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* a hashtable somewhere. But this is crucial for the frame rate.
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*/
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protected Vob interpTo;
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/** A 3-tuple with the global coordinates for this vob.
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* Conceptually this belongs in the VobStore, but I can't think of a
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* clean, not too wasteful implementation.
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*/
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protected int[] coords;
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/** The lowest-level VobSet this was placed into.
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*/
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public VobSet vobset;
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public Vob(ZZCell c) {
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this.c = c;
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}
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/** Get the visual center of this vob.
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*/
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public Point getCenter(Point p) {
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p.x = w/2; p.y = h/2;
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return p;
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}
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/** Get the visual center of this vob.
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*/
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public Point getCenter() {
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return getCenter(new Point());
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}
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/** Render this vob at the given coordinates.
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* Default: render nothing.
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* You may override either this function or one or both of
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* render(Graphics, int, int) and renderInterp(Graphics, int, int,
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int, int, float).
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*/
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public void render(Graphics g, int mx, int my, int md,
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int mw, int mh) {
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}
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/** Render this vob.
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* May be overridden; default implementation uses render(g, x, y, w, h, d);
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*/
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public void render(Graphics g, x, y, d) {
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render(g, x, y, d, w, h);
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}
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/** Render an interpolated version of this vob.
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* Default implementation uses render(g, x, y, d, w, h) with linearly
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* interpolated coordinates.
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*/
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public void renderInterp(Graphics g, float fract) {
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Vob r = interpTo;
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if(r==null) return;
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render(g,
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(int)(x + fract*(r.x-x)),
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(int)(y + fract*(r.y-y)),
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(int)(d + fract*(r.d-d)),
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(int)(w + fract*(r.w-w)),
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(int)(h + fract*(r.h-h))
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);
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}
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/** Whether it would make visually sense to interpolate
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* this vob.
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* Default implementation: whether the sum of the squares of
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* the differences of the coordinates and widths is more than 100.
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* Not a terribly useful measure but good enough.
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*/
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public boolean isInterpUseful() {
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Vob r = interpTo;
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if(r==null) return false;
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return (r.x - x) * (r.x - x) +
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(r.y - y) * (r.y - y) +
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(r.w - w) * (r.w - w) +
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(r.h - h) * (r.h - h) > 100;
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}
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/** Returns an object telling what was hit.
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* Default implementation: returns null.
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*/
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public Object hit(int x, int y) { return null; }
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/** A convenience routine to check whether a point
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* is inside the defining rectangle.
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* If the vob is (as many are) rectangular, this routine can
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* be used to check the hit.
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*/
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public final boolean insideRect(int x0, int y0) {
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return x0 >= x && y0 >= y && x0 < x+w && y0 < y+h;
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}
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}
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