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package net.java.sip.communicator.util;
import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;
/**
* The <tt>GraphicUtils</tt> is an utility class that gives access to some
* simple graphics operations, like an easy creating of a clipped shape or
* image, or painting of a border glow. Most of the code in this class is based
* on advices and examples in the "Java 2D Trickery: Soft Clipping".
*
* @author Yana Stamcheva
*/
public class GraphicUtils
{
/**
* Creates a rounded clipped shape with the given <tt>shapeWidth</tt>,
* <tt>shapeHeight</tt>, arc width and arc height.
* @param shapeWidth the width of the shape to create
* @param shapeHeight the height of the shape to create
* @param arcW the width of the arc to use to round the corners of the
* newly created shape
* @param arcH the height of the arc to use to round the corners of the
* newly created shape
* @return the created shape
*/
public static Shape createRoundedClipShape( int shapeWidth, int shapeHeight,
int arcW, int arcH)
{
return new RoundRectangle2D.Float( 0, 0,
shapeWidth, shapeHeight,
arcW, arcH);
}
/**
* Creates a clipped image from the given <tt>shape</tt>.
* @param shape the shape from which to create the image
* @param g the <tt>Graphics</tt> object giving access to the graphics
* device configuration
* @return the created <tt>BufferedImage</tt>
*/
public static BufferedImage createClipImage(Graphics2D g, Shape shape)
{
// Create a translucent intermediate image in which we can perform
// the soft clipping
GraphicsConfiguration gc = g.getDeviceConfiguration();
BufferedImage img = gc.createCompatibleImage(
shape.getBounds().width, shape.getBounds().height,
Transparency.TRANSLUCENT);
Graphics2D g2 = img.createGraphics();
// Clear the image so all pixels have zero alpha
g2.setComposite(AlphaComposite.Clear);
g2.fillRect(0, 0, shape.getBounds().width, shape.getBounds().height);
// Render our clip shape into the image. Note that we enable
// antialiasing to achieve the soft clipping effect. Try
// commenting out the line that enables antialiasing, and
// you will see that you end up with the usual hard clipping.
g2.setComposite(AlphaComposite.Src);
g2.setRenderingHint(
RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setColor(Color.WHITE);
g2.fill(shape);
g2.dispose();
return img;
}
/**
* Paints border glow over the given <tt>clipShape</tt> with the given
* glow high and low colors and the given <tt>glowWidth</tt>.
* @param g2 the <tt>Graphics</tt> object to use for painting
* @param glowWidth the width of the glow
* @param clipShape the shape where to paint the glow
* @param glowOuterHigh the color which will paint the higher glow
* @param glowOuterLow the color which will paint the lower glow
*/
public static void paintBorderGlow( Graphics2D g2,
int glowWidth,
Shape clipShape,
Color glowOuterHigh,
Color glowOuterLow)
{
int gw = glowWidth*2;
for (int i = gw; i >= 2; i -= 2)
{
float pct = (float)(gw - i) / (gw - 1);
Color mixHi = getMixedColor(glowOuterHigh, pct,
new Color(255, 255, 255, 200), 1.0f - pct);
Color mixLo = getMixedColor(glowOuterLow, pct,
new Color(255, 255, 255, 200), 1.0f - pct);
g2.setPaint(new GradientPaint(
0, clipShape.getBounds().height*0.25f, mixHi,
0, clipShape.getBounds().height, mixLo));
g2.setComposite(
AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, pct));
g2.setStroke(new BasicStroke(i));
g2.draw(clipShape);
}
}
/**
* Returns a mixed color from color <tt>c1</tt> and <tt>c2</tt>.
* @param c1 the start color
* @param pct1 the first color coefficient of the mix between 0 and 1
* @param c2 the end color
* @param pct2 the second color coefficient of the mix between 0 and 1
* @return the new mixed color
*/
private static Color getMixedColor( Color c1,
float pct1,
Color c2,
float pct2)
{
float[] clr1 = c1.getComponents(null);
float[] clr2 = c2.getComponents(null);
for (int i = 0; i < clr1.length; i++)
{
clr1[i] = (clr1[i] * pct1) + (clr2[i] * pct2);
}
return new Color(clr1[0], clr1[1], clr1[2], clr1[3]);
}
}
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