/*
Copyright 2006 Jerry Huxtable

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package cytoscape.visual.strokes; 

import java.awt.*;
import java.awt.geom.*;
import cytoscape.visual.LineStyle;

public abstract class ShapeStroke implements WidthStroke {
	private Shape shapes[];
	private float advance;
	private boolean repeat = true;
	private AffineTransform transform = new AffineTransform();
	private static final float FLATNESS = 0.1f;

	protected LineStyle lineStyle;
	protected float width;

	public ShapeStroke( Shape shapes[], float advance, LineStyle lineStyle, float width ) {
		this.advance = advance;
		this.shapes = new Shape[shapes.length];
		this.lineStyle = lineStyle;
		this.width = width;

		for ( int i = 0; i < this.shapes.length; i++ ) {
			Rectangle2D bounds = shapes[i].getBounds2D();
			transform.setToTranslation( -bounds.getCenterX(), -bounds.getCenterY() );
			this.shapes[i] = transform.createTransformedShape( shapes[i] );
		}
	}

	public Shape createStrokedShape( Shape shape ) {
		GeneralPath result = new GeneralPath();
		PathIterator it = new FlatteningPathIterator( shape.getPathIterator( null ), FLATNESS );
		float points[] = new float[6];
		float moveX = 0, moveY = 0;
		float lastX = 0, lastY = 0;
		float thisX = 0, thisY = 0;
		int type = 0;
		boolean first = false;
		float next = 0;
		int currentShape = 0;
		int length = shapes.length;

		float factor = 1;

		while ( currentShape < length && !it.isDone() ) {
			type = it.currentSegment( points );
			switch( type ){
			case PathIterator.SEG_MOVETO:
				moveX = lastX = points[0];
				moveY = lastY = points[1];
				result.moveTo( moveX, moveY );
				first = true;
				next = 0;
				break;

			case PathIterator.SEG_CLOSE:
				points[0] = moveX;
				points[1] = moveY;
				// Fall into....

			case PathIterator.SEG_LINETO:
				thisX = points[0];
				thisY = points[1];
				float dx = thisX-lastX;
				float dy = thisY-lastY;
				float distance = (float)Math.sqrt( dx*dx + dy*dy );
				if ( distance >= next ) {
					float r = 1.0f/distance;
					float angle = (float)Math.atan2( dy, dx );
					while ( currentShape < length && distance >= next ) {
						float x = lastX + next*dx*r;
						float y = lastY + next*dy*r;
						transform.setToTranslation( x, y );
						transform.rotate( angle );
						result.append( transform.createTransformedShape( shapes[currentShape] ), 
						               false );
						next += advance;
						currentShape++;
						if ( repeat )
							currentShape %= length;
					}
				}
				next -= distance;
				first = false;
				lastX = thisX;
				lastY = thisY;
				break;
			}
			it.next();
		}

		return result;
	}


	public LineStyle getLineStyle() {
		return lineStyle;
	}

	public String toString() { 
		return lineStyle.toString() + " " + Float.toString(width); 
	}
	
	abstract public WidthStroke newInstanceForWidth(float w);
}