mxvmlcanvas.java

经典的java图像处理程序源码

/**
 * $Id: mxVmlCanvas.java,v 1.38 2008/11/25 17:32:52 gaudenz Exp $
 * Copyright (c) 2007, Gaudenz Alder
 */
package com.mxgraph.canvas;

import java.awt.Rectangle;
import java.util.Hashtable;
import java.util.List;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

import com.mxgraph.util.mxConstants;
import com.mxgraph.util.mxPoint;
import com.mxgraph.util.mxUtils;

/**
 * An implementation of a canvas that uses VML for painting.
 */
public class mxVmlCanvas extends mxBasicCanvas
{

	/**
	 * Holds the HTML document that represents the canvas.
	 */
	protected Document document;

	/**
	 * Constructs a new VML canvas for the specified dimension and scale.
	 * 
	 * @param width Width of the canvas to be constructed.
	 * @param height Height of the canvas to be constructed.
	 * @param scale Scale of the canvas to be constructed.
	 */
	public mxVmlCanvas()
	{
		this(null);
	}

	/**
	 * Constructs a new VML canvas for the specified bounds, scale and
	 * background color.
	 * 
	 * @param x X-coordinate of the origin of the canvas.
	 * @param y Y-coordinate of the origin of the canvas.
	 * @param width Width of the canvas to be constructed.
	 * @param height Height of the canvas to be constructed.
	 * @param scale Scale of the canvas to be constructed.
	 * @param backgroundColor Color of the background. Default is null
	 * (transparent).
	 */
	public mxVmlCanvas(Document document)
	{
		setDocument(document);
	}

	/**
	 * 
	 */
	public void setDocument(Document document)
	{
		this.document = document;
	}
	
	/**
	 * Returns a reference to the document that represents the canvas.
	 * 
	 * @return Returns the document.
	 */
	public Document getDocument()
	{
		return document;
	}
	
	/**
	 * 
	 */
	public void appendVmlElement(Element node)
	{
		if (document != null)
		{
			Node body = document.getDocumentElement().getFirstChild().getNextSibling();
			
			if (body != null)
			{
				body.appendChild(node);
			}
		}
		
	}

	/* (non-Javadoc)
	 * @see com.mxgraph.canvas.mxICanvas#drawVertex(java.lang.String, int, int, int, int, mxPoint, java.util.Hashtable)
	 */
	public Object drawVertex(int x, int y, int w, int h, Hashtable style)
	{
		Element elem = null;
		int start = mxUtils.getInt(style, mxConstants.STYLE_STARTSIZE);

		x += translate.x;
		y += translate.y;

		if (start == 0)
		{
			elem = drawShape(x, y, w, h, style);
		}
		else
		{
			start = (int) Math.round(start * scale);

			// Removes some styles to draw the content area
			Hashtable cloned = new Hashtable(style);
			cloned.remove(mxConstants.STYLE_FILLCOLOR);
			cloned.remove(mxConstants.STYLE_ROUNDED);

			if (mxUtils.isTrue(style, mxConstants.STYLE_HORIZONTAL, true))
			{
				elem = drawShape(x, y, w, start, style);
				drawShape(x, y + start, w, h - start, cloned);
			}
			else
			{
				elem = drawShape(x, y, start, h, style);
				drawShape(x + start, y, w - start, h, cloned);
			}
		}

		return elem;
	}

	/* (non-Javadoc)
	 * @see com.mxgraph.canvas.mxICanvas#drawEdge(java.lang.String, java.util.List, com.mxgraph.utils.mxPoint, java.util.Hashtable)
	 */
	public Object drawEdge(List pts, Hashtable style)
	{
		// Transpose all points by cloning into a new array
		pts = mxUtils.translatePoints(pts, translate.x, translate.y);

		// Draws the line
		Element elem = drawLine(pts, style);

		// Draws the markers
		String start = mxUtils.getString(style, mxConstants.STYLE_STARTARROW);
		String end = mxUtils.getString(style, mxConstants.STYLE_ENDARROW);

		if (start != null || end != null)
		{
			Element strokeNode = document.createElement("v:stroke");

			if (start != null)
			{
				strokeNode.setAttribute("startarrow", start);

				String startWidth = "medium";
				String startLength = "medium";
				double startSize = mxUtils.getFloat(style,
						mxConstants.STYLE_STARTSIZE,
						mxConstants.DEFAULT_MARKERSIZE)
						* scale;

				if (startSize < 6)
				{
					startWidth = "narrow";
					startLength = "short";
				}
				else if (startSize > 10)
				{
					startWidth = "wide";
					startLength = "long";
				}

				strokeNode.setAttribute("startarrowwidth", startWidth);
				strokeNode.setAttribute("startarrowlength", startLength);
			}

			if (end != null)
			{
				strokeNode.setAttribute("endarrow", end);

				String endWidth = "medium";
				String endLength = "medium";
				double endSize = mxUtils.getFloat(style,
						mxConstants.STYLE_ENDSIZE,
						mxConstants.DEFAULT_MARKERSIZE)
						* scale;

				if (endSize < 6)
				{
					endWidth = "narrow";
					endLength = "short";
				}
				else if (endSize > 10)
				{
					endWidth = "wide";
					endLength = "long";
				}

				strokeNode.setAttribute("endarrowwidth", endWidth);
				strokeNode.setAttribute("endarrowlength", endLength);
			}

			elem.appendChild(strokeNode);
		}

		return elem;
	}

	/*
	 * (non-Javadoc)
	 * @see com.mxgraph.canvas.mxICanvas#drawLabel(java.lang.String, int, int, int, int, java.util.Hashtable, boolean)
	 */
	public Object drawLabel(String label, int x, int y, int w, int h,
			Hashtable style, boolean isHtml)
	{
		if (drawLabels)
		{
			x += translate.x;
			y += translate.y;

			return drawText(label, x, y, w, h, style);
		}

		return null;
	}

	/**
	 * Draws the shape specified with the STYLE_SHAPE key in the given style.
	 * 
	 * @param x X-coordinate of the shape.
	 * @param y Y-coordinate of the shape.
	 * @param w Width of the shape.
	 * @param h Height of the shape.
	 * @param style Style of the the shape.
	 */
	public Element drawShape(int x, int y, int w, int h, Hashtable style)
	{
		String fillColor = mxUtils
				.getString(style, mxConstants.STYLE_FILLCOLOR);
		String gradientColor = mxUtils.getString(style,
				mxConstants.STYLE_GRADIENTCOLOR);

		String strokeColor = mxUtils.getString(style,
				mxConstants.STYLE_STROKECOLOR);
		float strokeWidth = (float) (mxUtils.getFloat(style,
				mxConstants.STYLE_STROKEWIDTH, 1) * scale);

		// Draws the shape
		String shape = mxUtils.getString(style, mxConstants.STYLE_SHAPE);
		Element elem = null;

		if (shape.equals(mxConstants.SHAPE_IMAGE))
		{
			String img = getImageForStyle(style);

			if (img != null)
			{
				elem = document.createElement("v:img");
				elem.setAttribute("src", img);
			}
		}
		else if (shape.equals(mxConstants.SHAPE_LINE))
		{
			String direction = mxUtils.getString(style,
					mxConstants.STYLE_DIRECTION, mxConstants.DIRECTION_EAST);
			String points = null;

			if (direction.equals(mxConstants.DIRECTION_EAST)
					|| direction.equals(mxConstants.DIRECTION_WEST))
			{
				int mid = (int) Math.round(h / 2);
				points = "m 0 " + mid + " l " + w + " " + mid;
			}
			else
			{
				int mid = (int) Math.round(w / 2);
				points = "m " + mid + " 0 L " + mid + " " + h;
			}

			elem = document.createElement("v:shape");
			elem.setAttribute("coordsize", w + " " + h);
			elem.setAttribute("path", points + " x e");
		}
		else if (shape.equals(mxConstants.SHAPE_ELLIPSE))
		{
			elem = document.createElement("v:oval");
		}
		else if (shape.equals(mxConstants.SHAPE_DOUBLE_ELLIPSE))
		{
			elem = document.createElement("v:shape");
			elem.setAttribute("coordsize", w + " " + h);