package org.newdawn.slick.svg;
import java.util.ArrayList;
import org.newdawn.slick.geom.MorphShape;
/**
* A utility to allow morphing between a set of similar SVG diagrams
*
* @author kevin
*/
public class SVGMorph extends Diagram {
/** The list of figures being morphed */
private ArrayList figures = new ArrayList();
/**
* Create a new morph with a first diagram base
*
* @param diagram The base diagram which provides the first step of the morph
*/
public SVGMorph(Diagram diagram) {
for (int i=0;i<diagram.getFigureCount();i++) {
Figure figure = diagram.getFigure(i);
Figure copy = new Figure(figure.getType(), new MorphShape(figure.getShape()), figure.getData(), figure.getTransform());
figures.add(copy);
}
}
/**
* Add a subsquent step to the morphing
*
* @param diagram The diagram to add as the next step in the morph
*/
public void addStep(Diagram diagram) {
if (diagram.getFigureCount() != figures.size()) {
throw new RuntimeException("Mismatched diagrams, missing ids");
}
for (int i=0;i<diagram.getFigureCount();i++) {
Figure figure = diagram.getFigure(i);
String id = figure.getData().getMetaData();
for (int j=0;j<figures.size();j++) {
Figure existing = (Figure) figures.get(j);
if (existing.getData().getMetaData().equals(id)) {
MorphShape morph = (MorphShape) existing.getShape();
morph.addShape(figure.getShape());
break;
}
}
}
}
/**
* Set the current diagram we should morph from. This only really works with
* updateMorphTime() but can be used for smooth transitions between
* morphs.
*
* @param diagram The diagram to use as the base of the morph
*/
public void setExternalDiagram(Diagram diagram) {
for (int i=0;i<figures.size();i++) {
Figure figure = (Figure) figures.get(i);
for (int j=0;j<diagram.getFigureCount();j++) {
Figure newBase = diagram.getFigure(j);
if (newBase.getData().getMetaData().equals(figure.getData().getMetaData())) {
MorphShape shape = (MorphShape) figure.getShape();
shape.setExternalFrame(newBase.getShape());
break;
}
}
}
}
/**
* Update the morph time index by the amount specified
*
* @param delta The amount to update the morph by
*/
public void updateMorphTime(float delta) {
for (int i=0;i<figures.size();i++) {
Figure figure = (Figure) figures.get(i);
MorphShape shape = (MorphShape) figure.getShape();
shape.updateMorphTime(delta);
}
}
/**
* Set the "time" index for this morph. This is given in terms of diagrams, so
* 0.5f would give you the position half way between the first and second diagrams.
*
* @param time The time index to represent on this diagrams
*/
public void setMorphTime(float time) {
for (int i=0;i<figures.size();i++) {
Figure figure = (Figure) figures.get(i);
MorphShape shape = (MorphShape) figure.getShape();
shape.setMorphTime(time);
}
}
/**
* @see Diagram#getFigureCount()
*/
public int getFigureCount() {
return figures.size();
}
/**
* @see Diagram#getFigure(int)
*/
public Figure getFigure(int index) {
return (Figure) figures.get(index);
}
}