/*
 * @(#)Drawer.java                        2.1 2003/10/07
 *
 * Copyright (C) 1999, 2003 D.A. Watt and D.F. Brown
 * Dept. of Computing Science, University of Glasgow, Glasgow G12 8QQ Scotland
 * and School of Computer and Math Sciences, The Robert Gordon University,
 * St. Andrew Street, Aberdeen AB25 1HG, Scotland.
 * All rights reserved.
 *
 * This software is provided free for educational use only. It may
 * not be used for commercial purposes without the prior written permission
 * of the authors.
 */

package triangle.treeDrawer;

import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Point;

import triangle.abstractSyntaxTrees.Program;

public class Drawer {

	private DrawerFrame frame;
	private DrawerPanel panel;

	private Program theAST;
	private DrawingTree theDrawing;

	// Draw the AST representing a complete program.

	public void draw(Program ast) {
		theAST = ast;
		panel = new DrawerPanel(this);
		frame = new DrawerFrame(panel);

		Font font = new Font("SansSerif", Font.PLAIN, 12);
		frame.setFont(font);

		FontMetrics fontMetrics = frame.getFontMetrics(font);

		// another class of visitor is used for drawing the tree: LayoutVisitor
		// LayoutVisitor is passed to the AST which, in turn, calls visitProgram
		// and then each AST node is visited. This ultimately constructs a 
		// DrawingTree, which is structurally the same as the AST but is decorated
		// with coordinates (and has only DrawingTree objects as nodes)
		// Each DrawingTree object knows how to paint itself, so it's passed to a
		// DrawerPanel and DrawerFrame for display 
		LayoutVisitor layout = new LayoutVisitor(fontMetrics);
		theDrawing = (DrawingTree) theAST.visit(layout, null);
		theDrawing.position(new Point(2048, 10));

		frame.setVisible(true);
	}

	public void paintAST(Graphics g) {
		g.setColor(panel.getBackground());
		Dimension d = panel.getSize();
		g.fillRect(0, 0, d.width, d.height);

		if (theDrawing != null) {
			theDrawing.paint(g);
		}
	}
}