/*******************************************************************************
* Copyright (c) 2000, 2007 IBM Corporation and others.
* 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.draw2d;
import java.util.ArrayList;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontMetrics;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.draw2d.geometry.Dimension;
import org.eclipse.draw2d.geometry.Rectangle;
/**
* Provides miscellaneous Figure operations.
*/
public class FigureUtilities {
private static final float RGB_VALUE_MULTIPLIER = 0.6f;
private static GC gc;
private static Font appliedFont;
private static FontMetrics metrics;
private static Color ghostFillColor = new Color(null, 31, 31, 31);
/**
* Returns a new Color the same as the passed color in a darker hue.
*
* @param color the color to darken
* @return the darkened color
* @since 2.0
*/
public static Color darker(Color color) {
return new Color(null,
(int)(color.getRed() * RGB_VALUE_MULTIPLIER),
(int)(color.getGreen() * RGB_VALUE_MULTIPLIER),
(int)(color.getBlue() * RGB_VALUE_MULTIPLIER));
}
/**
* Returns the FontMetrics associated with the passed Font.
*
* @param f the font
* @return the FontMetrics for the given font
* @see GC#getFontMetrics()
* @since 2.0
*/
public static FontMetrics getFontMetrics(Font f) {
setFont(f);
if (metrics == null)
metrics = getGC().getFontMetrics();
return metrics;
}
/**
* Returns the GC used for various utilities. Advanced graphics must not be switched on by
* clients using this GC.
* @deprecated do not mess with this GC
* @return the GC
*/
protected static GC getGC() {
if (gc == null) {
gc = new GC(new Shell());
appliedFont = gc.getFont();
}
return gc;
}
/**
* Returns the dimensions of the String <i>s</i> using the font <i>f</i>. Tab expansion
* and carriage return processing are performed.
* @param s the string
* @param f the font
* @return the text's dimensions
* @see GC#textExtent(String)
*/
protected static org.eclipse.swt.graphics.Point getTextDimension(String s, Font f) {
setFont(f);
return getGC().textExtent(s);
}
/**
* Returns the highest ancestor for the given figure
* @since 3.0
* @param figure a figure
* @return the root ancestor
*/
public static IFigure getRoot(IFigure figure) {
while (figure.getParent() != null)
figure = figure.getParent();
return figure;
}
/**
* Returns the dimensions of the String <i>s</i> using the font <i>f</i>. No tab
* expansion or carriage return processing will be performed.
* @param s the string
* @param f the font
* @return the string's dimensions
* @see GC#stringExtent(java.lang.String)
*/
protected static org.eclipse.swt.graphics.Point getStringDimension(String s, Font f) {
setFont(f);
return getGC().stringExtent(s);
}
/**
* Returns the Dimensions of the given text, converting newlines and tabs appropriately.
*
* @param text the text
* @param f the font
* @return the dimensions of the given text
* @since 2.0
*/
public static Dimension getTextExtents(String text, Font f) {
return new Dimension(getTextDimension(text, f));
}
/**
* Returns the Dimensions of <i>s</i> in Font <i>f</i>.
*
* @param s the string
* @param f the font
* @return the dimensions of the given string
* @since 2.0
*/
public static Dimension getStringExtents(String s, Font f) {
return new Dimension(getStringDimension(s, f));
}
/**
* Returns the Dimensions of the given text, converting newlines and tabs appropriately.
*
* @param s the string
* @param f the font
* @param result the Dimension that will contain the result of this calculation
* @since 2.0
*/
public static void getTextExtents(String s, Font f, Dimension result) {
org.eclipse.swt.graphics.Point pt = getTextDimension(s, f);
result.width = pt.x;
result.height = pt.y;
}
/**
* Returns the width of <i>s</i> in Font <i>f</i>.
*
* @param s the string
* @param f the font
* @return the width
* @since 2.0
*/
public static int getTextWidth(String s, Font f) {
return getTextDimension(s, f).x;
}
/**
* Returns a Color the same as the passed color in a lighter hue.
*
* @param rgb the color
* @return the lighter color
* @since 2.0
*/
public static Color lighter(Color rgb) {
int r = rgb.getRed(),
g = rgb.getGreen(),
b = rgb.getBlue();
return new Color(null,
Math.max(2, Math.min((int)(r / RGB_VALUE_MULTIPLIER), 255)),
Math.max(2, Math.min((int)(g / RGB_VALUE_MULTIPLIER), 255)),
Math.max(2, Math.min((int)(b / RGB_VALUE_MULTIPLIER), 255))
);
}
/**
* Produces a ghosting effect on the shape <i>s</i>.
*
* @param s the shape
* @return the ghosted shape
* @since 2.0
*/
public static Shape makeGhostShape(Shape s) {
s.setBackgroundColor(ghostFillColor);
s.setFillXOR(true);
s.setOutlineXOR(true);
return s;
}
/**
* Mixes the passed Colors and returns the resulting Color.
*
* @param c1 the first color
* @param c2 the second color
* @param weight the first color's weight from 0-1
* @return the new color
* @since 2.0
*/
public static Color mixColors(Color c1, Color c2, double weight) {
return new Color(null,
(int)(c1.getRed() * weight + c2.getRed() * (1 - weight)),
(int)(c1.getGreen() * weight + c2.getGreen() * (1 - weight)),
(int)(c1.getBlue() * weight + c2.getBlue() * (1 - weight)));
}
/**
* Mixes the passed Colors and returns the resulting Color.
*
* @param c1 the first color
* @param c2 the second color
* @return the new color
* @since 2.0
*/
public static Color mixColors(Color c1, Color c2) {
return new Color(null,
(c1.getRed() + c2.getRed()) / 2,
(c1.getGreen() + c2.getGreen()) / 2,
(c1.getBlue() + c2.getBlue()) / 2);
}
/**
* Paints a border with an etching effect, having a shadow of Color <i>shadow</i> and
* highlight of Color <i>highlight</i>.
*
* @param g the graphics object
* @param r the bounds of the border
* @param shadow the shadow color
* @param highlight the highlight color
* @since 2.0
*/
public static void paintEtchedBorder(Graphics g, Rectangle r,
Color shadow, Color highlight) {
int x = r.x,
y = r.y,
w = r.width,
h = r.height;
g.setLineStyle(Graphics.LINE_SOLID);
g.setLineWidth(1);
g.setXORMode(false);
w -= 2;
h -= 2;
g.setForegroundColor(shadow);
g.drawRectangle(x, y, w, h);
x++;
y++;
g.setForegroundColor(highlight);
g.drawRectangle(x, y, w, h);
}
/**
* Helper method to paint a grid. Painting is optimized as it is restricted to the
* Graphics' clip.
*
* @param g The Graphics object to be used for painting
* @param f The figure in which the grid is to be painted
* @param origin Any point where the grid lines are expected to intersect
* @param distanceX Distance between vertical grid lines; if 0 or less, vertical grid
* lines will not be drawn
* @param distanceY Distance between horizontal grid lines; if 0 or less, horizontal
* grid lines will not be drawn
*
* @since 3.0
*/
public static void paintGrid(Graphics g, IFigure f,
org.eclipse.draw2d.geometry.Point origin, int distanceX, int distanceY) {
Rectangle clip = g.getClip(Rectangle.SINGLETON);
if (distanceX > 0) {
if (origin.x >= clip.x)
while (origin.x - distanceX >= clip.x)
origin.x -= distanceX;
else
while (origin.x < clip.x)
origin.x += distanceX;
for (int i = origin.x; i < clip.x + clip.width; i += distanceX)
g.drawLine(i, clip.y, i, clip.y + clip.height);
}
if (distanceY > 0) {
if (origin.y >= clip.y)
while (origin.y - distanceY >= clip.y)
origin.y -= distanceY;
else
while (origin.y < clip.y)
origin.y += distanceY;
for (int i = origin.y; i < clip.y + clip.height; i += distanceY)
g.drawLine(clip.x, i, clip.x + clip.width, i);
}
}
/**
* Paints a border with an etching effect, having a shadow of a darker version of g's
* background color, and a highlight a lighter version of g's background color.
*
* @param g the graphics object
* @param r the bounds of the border
* @since 2.0
*/
public static void paintEtchedBorder(Graphics g, Rectangle r) {
Color rgb = g.getBackgroundColor(),
shadow = darker(rgb),
highlight = lighter(rgb);
paintEtchedBorder(g, r, shadow, highlight);
}
/**
* Sets Font to passed value.
*
* @param f the new font
* @since 2.0
*/
protected static void setFont(Font f) {
if (appliedFont == f || f.equals(appliedFont))
return;
getGC().setFont(f);
appliedFont = f;
metrics = null;
}
/**
* Returns the figure which is the ancestor of both figures, or <code>null</code>. A
* figure is an ancestor if it is the parent of another figure, or if it is the ancestor
* of that figure's parent. If one figure contains the other, <code>null</code> is
* returned.
* @since 3.1
* @param l left
* @param r right
* @return the common ancestor
*/
public static IFigure findCommonAncestor(IFigure l, IFigure r) {
if (l == r)
return l;
ArrayList left = new ArrayList();
ArrayList right = new ArrayList();
while (l != null) {
left.add(l);
l = l.getParent();
}
while (r != null) {
right.add(r);
r = r.getParent();
}
if (left.isEmpty() || right.isEmpty())
return null;
int il = left.size() - 1;
int ir = right.size() - 1;
do {
if (left.get(il) != right.get(ir))
break;
il--;
ir--;
} while (il >= 0 && ir >= 0);
return (IFigure) left.get(il + 1);
}
/**
* Returns <code>true</code> if the ancestor contains the descendant, or is the ancestor
* of the descendant's parent.
* @param ancestor the ancestor
* @param descendant the descendant
* @return <code>true</code> if ancestor
* @since 3.2
*/
public static boolean isAncestor(final IFigure ancestor, IFigure descendant) {
while (descendant != null) {
descendant = descendant.getParent();
if (descendant == ancestor)
return true;
}
return false;
}
}