/*******************************************************************************
 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
 * in Industry THTH ry.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.trend.impl;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.font.GlyphVector;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;

import org.simantics.g2d.utils.GridUtil;
import org.simantics.scenegraph.ExportableWidget.OutputWidget;

/**
 * TextNode, the text is centered and scaled to fit inside the bounds.
 *
 * @author toni.kalajainen
 */
@OutputWidget("text")
public class TextNode extends TrendGraphicalNode {

    private static final long serialVersionUID = 8508750881358776559L;

    String      text   = null;
    Font        font   = null;
    Color       color  = Color.BLACK;
    
    transient double sx, sy, tw, th, tx, ty;

    @SyncField("font")
    public void setFont(Font font) {
        this.font = font;
    }
    
    @SyncField("text")
    public void setText(String text) {
        this.text = text;
    }
    
    @SyncField("color")
    public void setColor(Color color) {
        this.color = color;
    }
    
    public void layout() {
		GlyphVector glyphVector = font.createGlyphVector(GridUtil.frc, text);
    	Rectangle2D tr = glyphVector.getVisualBounds().getBounds2D();
    	tw = tr.getWidth();
    	th = tr.getHeight();
    	sx = getWidth() / tw;
    	sy = getHeight() / th;
    	tx = -tr.getX();
    	ty = -tr.getY();
    	
    	// Fix horiz scale param sx
    	if (sx<1.0) {
        	// Text is too wide
    		// Scale-down to fit rectangle width
    		tw *= sx;
    		th *= sx;
    		sy *= sx;
    		tx *= sx;
    		ty *= sx;
    	} else {
    		// Text is ok horizontally. No need to scale.
    		sx = 1.0;
    	}
    	
    	// Fix vert scale param sy
    	if (sy<1.0) {
    		// Text is too tall
    		// Scale-down to fit rectangle height
    		tw *= sy;
    		th *= sy;
    		sx *= sy;
    		tx *= sy;
    		ty *= sy;
    	} else {
    		// Text is ok vertically. No need to scale.
    		sy = 1.0;
    	}
    	
        tx += (bounds.getWidth() - tw) / 2;
        ty += (bounds.getHeight() - th) / 2;    	
    }

	@Override
	protected void doRender(Graphics2D g) {
        if (text == null || bounds == null || font == null || color == null)
            return;

        g.setFont(font);
        g.setColor(color);
        
        AffineTransform at = g.getTransform();
        
        g.translate( bounds.getX(), bounds.getY() );
        g.translate(tx, ty);
        g.scale(sx, sy);

        g.drawString(text, 0, 0);
        g.setTransform( at );
	}    
    
}