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mxUtils.java
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2541 lines (2243 loc) · 65.5 KB
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/**
* Copyright (c) 2007-2012, JGraph Ltd
*/
package com.mxgraph.util;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.font.FontRenderContext;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.ImageObserver;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Comparator;
import java.util.Formatter;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.SortedSet;
import java.util.Stack;
import java.util.TreeSet;
import javax.imageio.ImageIO;
import javax.swing.text.html.HTMLDocument;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import com.mxgraph.io.mxCodecRegistry;
import com.mxgraph.model.mxCellPath;
import com.mxgraph.model.mxICell;
import com.mxgraph.model.mxIGraphModel;
import com.mxgraph.view.mxCellState;
/**
* Contains various helper methods for use with mxGraph.
*/
public class mxUtils
{
/**
* True if the machine is a Mac.
*/
public static boolean IS_MAC = System.getProperty("os.name").toLowerCase()
.indexOf("mac") >= 0;
/**
* True if the machine is running a linux kernel.
*/
public static boolean IS_LINUX = System.getProperty("os.name")
.toLowerCase().indexOf("linux") >= 0;
/**
* Static Graphics used for Font Metrics.
*/
protected static transient Graphics fontGraphics;
// Creates a renderer for HTML markup (only possible in
// non-headless environment)
static
{
try
{
fontGraphics = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB)
.getGraphics();
}
catch (Exception e)
{
// ignore
}
}
/**
* Returns the size for the given label. If isHtml is true then any HTML
* markup in the label is computed as HTML and all newlines inside the HTML
* body are converted into linebreaks.
*/
public static mxRectangle getLabelSize(String label,
Map<String, Object> style, boolean isHtml, double scale)
{
return getLabelSize(label, style, isHtml, scale, 0);
}
/**
* Returns the size for the given label. If isHtml is true then any HTML
* markup in the label is computed as HTML and all newlines inside the HTML
* body are converted into linebreaks.
*/
public static mxRectangle getLabelSize(String label,
Map<String, Object> style, boolean isHtml, double scale,
double htmlWrapWidth)
{
mxRectangle size;
if (isHtml)
{
size = getSizeForHtml(getBodyMarkup(label, true), style, scale,
htmlWrapWidth);
}
else
{
size = getSizeForString(label, getFont(style), scale);
}
return size;
}
/**
* Returns the body part of the given HTML markup.
*/
public static String getBodyMarkup(String markup, boolean replaceLinefeeds)
{
String lowerCase = markup.toLowerCase();
int bodyStart = lowerCase.indexOf("<body>");
if (bodyStart >= 0)
{
bodyStart += 7;
int bodyEnd = lowerCase.lastIndexOf("</body>");
if (bodyEnd > bodyStart)
{
markup = markup.substring(bodyStart, bodyEnd).trim();
}
}
if (replaceLinefeeds)
{
markup = markup.replaceAll("\n", "<br>");
}
return markup;
}
/**
* Returns the paint bounds for the given label.
*/
public static mxRectangle getLabelPaintBounds(String label,
Map<String, Object> style, boolean isHtml, mxPoint offset,
mxRectangle vertexBounds, double scale)
{
return getLabelPaintBounds(label, style, isHtml, offset, vertexBounds,
scale, false);
}
/**
* Returns the paint bounds for the given label.
*/
public static mxRectangle getLabelPaintBounds(String label,
Map<String, Object> style, boolean isHtml, mxPoint offset,
mxRectangle vertexBounds, double scale, boolean isEdge)
{
double wrapWidth = 0;
if (isHtml
&& vertexBounds != null
&& mxUtils.getString(style, mxConstants.STYLE_WHITE_SPACE,
"nowrap").equals("wrap"))
{
wrapWidth = vertexBounds.getWidth();
}
mxRectangle size = mxUtils.getLabelSize(label, style, isHtml, scale,
wrapWidth);
// Measures font with full scale and scales back
size.setWidth(size.getWidth() / scale);
size.setHeight(size.getHeight() / scale);
double x = offset.getX();
double y = offset.getY();
double width = 0;
double height = 0;
if (vertexBounds != null)
{
x += vertexBounds.getX();
y += vertexBounds.getY();
if (mxUtils.getString(style, mxConstants.STYLE_SHAPE, "").equals(
mxConstants.SHAPE_SWIMLANE))
{
// Limits the label to the swimlane title
boolean horizontal = mxUtils.isTrue(style,
mxConstants.STYLE_HORIZONTAL, true);
double start = mxUtils.getDouble(style,
mxConstants.STYLE_STARTSIZE,
mxConstants.DEFAULT_STARTSIZE)
* scale;
if (horizontal)
{
width += vertexBounds.getWidth();
height += start;
}
else
{
width += start;
height += vertexBounds.getHeight();
}
}
else
{
width += (isEdge) ? 0 : vertexBounds.getWidth();
height += vertexBounds.getHeight();
}
}
return mxUtils.getScaledLabelBounds(x, y, size, width, height, style,
scale);
}
/**
* Returns the bounds for a label for the given location and size, taking
* into account the alignment and spacing in the specified style, as well as
* the width and height of the rectangle that contains the label. (For edge
* labels this width and height is 0.) The scale is used to scale the given
* size and the spacings in the specified style.
*/
public static mxRectangle getScaledLabelBounds(double x, double y,
mxRectangle size, double outerWidth, double outerHeight,
Map<String, Object> style, double scale)
{
double inset = mxConstants.LABEL_INSET * scale;
// Scales the size of the label
// FIXME: Correct rounded font size and not-rounded scale
double width = size.getWidth() * scale + 2 * inset;
double height = size.getHeight() * scale + 2 * inset;
// Gets the global spacing and orientation
boolean horizontal = isTrue(style, mxConstants.STYLE_HORIZONTAL, true);
int spacing = (int) (getInt(style, mxConstants.STYLE_SPACING) * scale);
// Gets the alignment settings
Object align = getString(style, mxConstants.STYLE_ALIGN,
mxConstants.ALIGN_CENTER);
Object valign = getString(style, mxConstants.STYLE_VERTICAL_ALIGN,
mxConstants.ALIGN_MIDDLE);
// Gets the vertical spacing
int top = (int) (getInt(style, mxConstants.STYLE_SPACING_TOP) * scale);
int bottom = (int) (getInt(style, mxConstants.STYLE_SPACING_BOTTOM) * scale);
// Gets the horizontal spacing
int left = (int) (getInt(style, mxConstants.STYLE_SPACING_LEFT) * scale);
int right = (int) (getInt(style, mxConstants.STYLE_SPACING_RIGHT) * scale);
// Applies the orientation to the spacings and dimension
if (!horizontal)
{
int tmp = top;
top = right;
right = bottom;
bottom = left;
left = tmp;
double tmp2 = width;
width = height;
height = tmp2;
}
// Computes the position of the label for the horizontal alignment
if ((horizontal && align.equals(mxConstants.ALIGN_CENTER))
|| (!horizontal && valign.equals(mxConstants.ALIGN_MIDDLE)))
{
x += (outerWidth - width) / 2 + left - right;
}
else if ((horizontal && align.equals(mxConstants.ALIGN_RIGHT))
|| (!horizontal && valign.equals(mxConstants.ALIGN_BOTTOM)))
{
x += outerWidth - width - spacing - right;
}
else
{
x += spacing + left;
}
// Computes the position of the label for the vertical alignment
if ((!horizontal && align.equals(mxConstants.ALIGN_CENTER))
|| (horizontal && valign.equals(mxConstants.ALIGN_MIDDLE)))
{
y += (outerHeight - height) / 2 + top - bottom;
}
else if ((!horizontal && align.equals(mxConstants.ALIGN_LEFT))
|| (horizontal && valign.equals(mxConstants.ALIGN_BOTTOM)))
{
y += outerHeight - height - spacing - bottom;
}
else
{
y += spacing + top;
}
return new mxRectangle(x, y, width, height);
}
/**
* Returns the font metrics of the static font graphics instance
* @param font The font whose metrics are to be returned
* @return the font metrics of the specified font
*/
public static FontMetrics getFontMetrics(Font font)
{
if (fontGraphics != null)
{
return fontGraphics.getFontMetrics(font);
}
return null;
}
/**
* Returns an <mxRectangle> with the size (width and height in pixels) of
* the given string.
*
* @param text
* String whose size should be returned.
* @param font
* Font to be used for the computation.
*/
public static mxRectangle getSizeForString(String text, Font font,
double scale)
{
FontRenderContext frc = new FontRenderContext(null, false, false);
font = font.deriveFont((float) (font.getSize2D() * scale));
FontMetrics metrics = null;
if (fontGraphics != null)
{
metrics = fontGraphics.getFontMetrics(font);
}
double lineHeight = mxConstants.LINESPACING;
if (metrics != null)
{
lineHeight += metrics.getHeight();
}
else
{
lineHeight += font.getSize2D() * 1.27;
}
String[] lines = text.split("\n");
Rectangle2D boundingBox = null;
if (lines.length == 0)
{
boundingBox = font.getStringBounds("", frc);
}
else
{
for (int i = 0; i < lines.length; i++)
{
Rectangle2D bounds = font.getStringBounds(lines[i], frc);
if (boundingBox == null)
{
boundingBox = bounds;
}
else
{
boundingBox
.setFrame(
0,
0,
Math.max(boundingBox.getWidth(),
bounds.getWidth()),
boundingBox.getHeight() + lineHeight);
}
}
}
return new mxRectangle(boundingBox);
}
/**
* Returns the specified text in lines that fit within the specified
* width when the specified font metrics are applied to the text
* @param text the text to wrap
* @param metrics the font metrics to calculate the text size for
* @param width the width that the text must fit within
* @return the input text split in lines that fit the specified width
*/
public static String[] wordWrap(String text, FontMetrics metrics,
double width)
{
List<String> result = new ArrayList<String>();
// First split the processing into lines already delimited by
// newlines. We want the result to retain all newlines in position.
String[] lines = text.split("\n");
for (int i = 0; i < lines.length; i++)
{
int lineWidth = 0; // the display width of the current line
int charCount = 0; // keeps count of current position in the line
StringBuilder currentLine = new StringBuilder();
// Split the words of the current line by spaces and tabs
// The words are trimmed of tabs, space and newlines, therefore
String[] words = lines[i].split("\\s+");
// Need to a form a stack of the words in reverse order
// This is because if a word is split during the process
// the remainder of the word is added to the front of the
// stack and processed next
Stack<String> wordStack = new Stack<String>();
for (int j = words.length - 1; j >= 0; j--)
{
wordStack.push(words[j]);
}
while (!wordStack.isEmpty())
{
String word = wordStack.pop();
// Work out what whitespace exists before this word.
// and add the width of the whitespace to the calculation
int whitespaceCount = 0;
if (word.length() > 0)
{
// Concatenate any preceding whitespace to the
// word and calculate the number of characters of that
// whitespace
char firstWordLetter = word.charAt(0);
int letterIndex = lines[i].indexOf(firstWordLetter,
charCount);
String whitespace = lines[i].substring(charCount,
letterIndex);
whitespaceCount = whitespace.length();
word = whitespace.concat(word);
}
double wordLength;
// If the line width is zero, we are at the start of a newline
// We don't proceed preceeding whitespace in the width
// calculation
if (lineWidth > 0)
{
wordLength = metrics.stringWidth(word);
}
else
{
wordLength = metrics.stringWidth(word.trim());
}
// Does the width of line so far plus the width of the
// current word exceed the allowed width?
if (lineWidth + wordLength > width)
{
if (lineWidth > 0)
{
// There is already at least one word on this line
// and the current word takes the overall width over
// the allowed width. Because there is something on
// the line, complete the current line, reset the width
// counter, create a new line and put the current word
// back on the stack for processing in the next round
result.add(currentLine.toString());
currentLine = new StringBuilder();
wordStack.push(word.trim());
lineWidth = 0;
}
else if (mxConstants.SPLIT_WORDS)
{
// There are no words on the current line and the
// current word does not fit on it. Find the maximum
// number of characters of this word that just fit
// in the available width
word = word.trim();
for (int j = 1; j <= word.length(); j++)
{
wordLength = metrics.stringWidth(word.substring(0,
j));
if (lineWidth + wordLength > width)
{
// The last character took us over the allowed
// width, deducted it unless there is only one
// character, in which case we have to use it
// since we can't split it...
j = j > 1 ? j - 1 : j;
String chars = word.substring(0, j);
currentLine = currentLine.append(chars);
// Return the unprocessed part of the word
// to the stack
wordStack
.push(word.substring(j, word.length()));
result.add(currentLine.toString());
currentLine = new StringBuilder();
lineWidth = 0;
// Increment char counter allowing for white
// space in the original word
charCount = charCount + chars.length()
+ whitespaceCount;
break;
}
}
}
else
{
// There are no words on the current line, but
// we are not splitting.
word = word.trim();
result.add(word);
currentLine = new StringBuilder();
lineWidth = 0;
// Increment char counter allowing for white
// space in the original word
charCount = word.length() + whitespaceCount;
}
}
else
{
// The current word does not take the total line width
// over the allowed width. Append the word, removing
// preceeding whitespace if it is the first word in the
// line.
if (lineWidth > 0)
{
currentLine = currentLine.append(word);
}
else
{
currentLine = currentLine.append(word.trim());
}
lineWidth += wordLength;
charCount += word.length();
}
}
result.add(currentLine.toString());
}
return result.toArray(new String[result.size()]);
}
/**
* Returns an mxRectangle with the size (width and height in pixels) of the
* given HTML markup.
*
* @param markup
* HTML markup whose size should be returned.
*/
public static mxRectangle getSizeForHtml(String markup,
Map<String, Object> style, double scale, double wrapWidth)
{
mxLightweightLabel textRenderer = mxLightweightLabel
.getSharedInstance();
if (textRenderer != null)
{
// First run measures size with no wrapping
textRenderer.setText(createHtmlDocument(style, markup));
Dimension size = textRenderer.getPreferredSize();
// Second run measures size with wrapping if required.
// Note that this is only required because max-width
// is not supported and we can't get the width of an
// inner HTML element (or is this possible?).
if (wrapWidth > 0)
{
textRenderer.setText(createHtmlDocument(
style,
markup,
1,
(int) Math.ceil(wrapWidth - mxConstants.LABEL_INSET
* scale)));
Dimension size2 = textRenderer.getPreferredSize();
// Uses wrapped text size if any text was actually wrapped
if (size2.width < size.width)
{
size = size2;
}
}
return new mxRectangle(0, 0, size.width * scale, size.height
* scale);
}
else
{
return getSizeForString(markup, getFont(style), scale);
}
}
/**
* Function: arcToCurves
*
* Converts the given arc to a series of curves.
*/
public static double[] arcToCurves(double x0, double y0, double r1,
double r2, double angle, double largeArcFlag, double sweepFlag,
double x, double y)
{
x -= x0;
y -= y0;
if (r1 == 0 || r2 == 0)
{
return new double[0];
}
double fS = sweepFlag;
double psai = angle;
r1 = Math.abs(r1);
r2 = Math.abs(r2);
double ctx = -x / 2;
double cty = -y / 2;
double cpsi = Math.cos(psai * Math.PI / 180);
double spsi = Math.sin(psai * Math.PI / 180);
double rxd = cpsi * ctx + spsi * cty;
double ryd = -1 * spsi * ctx + cpsi * cty;
double rxdd = rxd * rxd;
double rydd = ryd * ryd;
double r1x = r1 * r1;
double r2y = r2 * r2;
double lamda = rxdd / r1x + rydd / r2y;
double sds;
if (lamda > 1)
{
r1 = Math.sqrt(lamda) * r1;
r2 = Math.sqrt(lamda) * r2;
sds = 0;
}
else
{
double seif = 1;
if (largeArcFlag == fS)
{
seif = -1;
}
sds = seif
* Math.sqrt((r1x * r2y - r1x * rydd - r2y * rxdd)
/ (r1x * rydd + r2y * rxdd));
}
double txd = sds * r1 * ryd / r2;
double tyd = -1 * sds * r2 * rxd / r1;
double tx = cpsi * txd - spsi * tyd + x / 2;
double ty = spsi * txd + cpsi * tyd + y / 2;
double rad = Math.atan2((ryd - tyd) / r2, (rxd - txd) / r1)
- Math.atan2(0, 1);
double s1 = (rad >= 0) ? rad : 2 * Math.PI + rad;
rad = Math.atan2((-ryd - tyd) / r2, (-rxd - txd) / r1)
- Math.atan2((ryd - tyd) / r2, (rxd - txd) / r1);
double dr = (rad >= 0) ? rad : 2 * Math.PI + rad;
if (fS == 0 && dr > 0)
{
dr -= 2 * Math.PI;
}
else if (fS != 0 && dr < 0)
{
dr += 2 * Math.PI;
}
double sse = dr * 2 / Math.PI;
int seg = (int) Math.ceil(sse < 0 ? -1 * sse : sse);
double segr = dr / seg;
double t = 8 / 3 * Math.sin(segr / 4) * Math.sin(segr / 4)
/ Math.sin(segr / 2);
double cpsir1 = cpsi * r1;
double cpsir2 = cpsi * r2;
double spsir1 = spsi * r1;
double spsir2 = spsi * r2;
double mc = Math.cos(s1);
double ms = Math.sin(s1);
double x2 = -t * (cpsir1 * ms + spsir2 * mc);
double y2 = -t * (spsir1 * ms - cpsir2 * mc);
double x3 = 0;
double y3 = 0;
double[] result = new double[seg * 6];
for (int n = 0; n < seg; ++n)
{
s1 += segr;
mc = Math.cos(s1);
ms = Math.sin(s1);
x3 = cpsir1 * mc - spsir2 * ms + tx;
y3 = spsir1 * mc + cpsir2 * ms + ty;
double dx = -t * (cpsir1 * ms + spsir2 * mc);
double dy = -t * (spsir1 * ms - cpsir2 * mc);
// CurveTo updates x0, y0 so need to restore it
int index = n * 6;
result[index] = x2 + x0;
result[index + 1] = y2 + y0;
result[index + 2] = x3 - dx + x0;
result[index + 3] = y3 - dy + y0;
result[index + 4] = x3 + x0;
result[index + 5] = y3 + y0;
x2 = x3 + dx;
y2 = y3 + dy;
}
return result;
}
/**
* Returns the bounding box for the rotated rectangle.
*/
public static mxRectangle getBoundingBox(mxRectangle rect, double rotation)
{
mxRectangle result = null;
if (rect != null && rotation != 0)
{
double rad = Math.toRadians(rotation);
double cos = Math.cos(rad);
double sin = Math.sin(rad);
mxPoint cx = new mxPoint(rect.getX() + rect.getWidth() / 2,
rect.getY() + rect.getHeight() / 2);
mxPoint p1 = new mxPoint(rect.getX(), rect.getY());
mxPoint p2 = new mxPoint(rect.getX() + rect.getWidth(), rect.getY());
mxPoint p3 = new mxPoint(p2.getX(), rect.getY() + rect.getHeight());
mxPoint p4 = new mxPoint(rect.getX(), p3.getY());
p1 = getRotatedPoint(p1, cos, sin, cx);
p2 = getRotatedPoint(p2, cos, sin, cx);
p3 = getRotatedPoint(p3, cos, sin, cx);
p4 = getRotatedPoint(p4, cos, sin, cx);
Rectangle tmp = new Rectangle((int) p1.getX(), (int) p1.getY(), 0,
0);
tmp.add(p2.getPoint());
tmp.add(p3.getPoint());
tmp.add(p4.getPoint());
result = new mxRectangle(tmp);
}
else if (rect != null)
{
result = (mxRectangle) rect.clone();
}
return result;
}
/**
* Find the first character matching the input character in the given
* string where the character has no letter preceding it.
*
* @param text the string to test for the presence of the input character
* @param inputChar the test character
* @param fromIndex the index position of the string to start from
* @return the position of the first character matching the input character
* in the given string where the character has no letter preceding it.
*/
public static int firstCharAt(String text, int inputChar, int fromIndex)
{
int result = 0;
while (result >= 0)
{
result = text.indexOf(inputChar, fromIndex);
if (result == 0)
{
return result;
}
else if (result > 0)
{
// Check there is a whitespace or symbol before the hit character
if (Character.isLetter(text.codePointAt(result - 1)))
{
// The pre-increment is used in if and else branches.
if (++fromIndex >= text.length())
{
return -1;
}
else
{
// Test again from next candidate character
// This isn't the first letter of this word
result = text.indexOf(inputChar, fromIndex);
}
}
else
{
return result;
}
}
}
return result;
}
/**
* Rotates the given point by the given cos and sin.
*/
public static mxPoint getRotatedPoint(mxPoint pt, double cos, double sin)
{
return getRotatedPoint(pt, cos, sin, new mxPoint());
}
/**
* Finds the index of the nearest segment on the given cell state for the
* specified coordinate pair.
*/
public static int findNearestSegment(mxCellState state, double x, double y)
{
int index = -1;
if (state.getAbsolutePointCount() > 0)
{
mxPoint last = state.getAbsolutePoint(0);
double min = Double.MAX_VALUE;
for (int i = 1; i < state.getAbsolutePointCount(); i++)
{
mxPoint current = state.getAbsolutePoint(i);
double dist = new Line2D.Double(last.x, last.y, current.x,
current.y).ptSegDistSq(x, y);
if (dist < min)
{
min = dist;
index = i - 1;
}
last = current;
}
}
return index;
}
/**
* Rotates the given point by the given cos and sin.
*/
public static mxPoint getRotatedPoint(mxPoint pt, double cos, double sin,
mxPoint c)
{
double x = pt.getX() - c.getX();
double y = pt.getY() - c.getY();
double x1 = x * cos - y * sin;
double y1 = y * cos + x * sin;
return new mxPoint(x1 + c.getX(), y1 + c.getY());
}
/**
* Returns an integer mask of the port constraints of the given map
* @param terminal the cached cell state of the cell to determine the
* port constraints for
* @param edge the edge connected to the constrained terminal
* @param source whether or not the edge specified is connected to the
* terminal specified at its source end
* @return the mask of port constraint directions
*/
public static int getPortConstraints(mxCellState terminal,
mxCellState edge, boolean source)
{
return getPortConstraints(terminal, edge, source,
mxConstants.DIRECTION_MASK_ALL);
}
/**
* Returns an integer mask of the port constraints of the given map
* @param terminal the cached cell state of the cell to determine the
* port constraints for
* @param edge the edge connected to the constrained terminal
* @param source whether or not the edge specified is connected to the
* terminal specified at its source end
* @param defaultValue Default value to return if the key is undefined.
* @return the mask of port constraint directions
*/
public static int getPortConstraints(mxCellState terminal,
mxCellState edge, boolean source, int defaultValue)
{
Object value = terminal.getStyle().get(
mxConstants.STYLE_PORT_CONSTRAINT);
if (value == null)
{
return defaultValue;
}
else
{
String directions = value.toString();
int returnValue = mxConstants.DIRECTION_MASK_NONE;
if (directions.indexOf(mxConstants.DIRECTION_NORTH) >= 0)
{
returnValue |= mxConstants.DIRECTION_MASK_NORTH;
}
if (directions.indexOf(mxConstants.DIRECTION_WEST) >= 0)
{
returnValue |= mxConstants.DIRECTION_MASK_WEST;
}
if (directions.indexOf(mxConstants.DIRECTION_SOUTH) >= 0)
{
returnValue |= mxConstants.DIRECTION_MASK_SOUTH;
}
if (directions.indexOf(mxConstants.DIRECTION_EAST) >= 0)
{
returnValue |= mxConstants.DIRECTION_MASK_EAST;
}
return returnValue;
}
}
public static int reversePortConstraints(int constraint)
{
int result = 0;
result = (constraint & mxConstants.DIRECTION_MASK_WEST) << 3;
result |= (constraint & mxConstants.DIRECTION_MASK_NORTH) << 1;
result |= (constraint & mxConstants.DIRECTION_MASK_SOUTH) >> 1;
result |= (constraint & mxConstants.DIRECTION_MASK_EAST) >> 3;
return result;
}
/**
* Draws the image inside the clip bounds to the given graphics object.
*/
public static void drawImageClip(Graphics g, BufferedImage image,
ImageObserver observer)
{
Rectangle clip = g.getClipBounds();
if (clip != null)
{
int w = image.getWidth();
int h = image.getHeight();
int x = Math.max(0, Math.min(clip.x, w));
int y = Math.max(0, Math.min(clip.y, h));
w = Math.min(clip.width, w - x);
h = Math.min(clip.height, h - y);
if (w > 0 && h > 0)
{
// TODO: Support for normal images using fast subimage copies
g.drawImage(image.getSubimage(x, y, w, h), clip.x, clip.y,
observer);
}
}
else
{
g.drawImage(image, 0, 0, observer);
}
}
/**
*
*/
public static void fillClippedRect(Graphics g, int x, int y, int width,
int height)
{
Rectangle bg = new Rectangle(x, y, width, height);
try
{
if (g.getClipBounds() != null)
{