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package tim.prune.gui;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.ConvolveOp;
import java.awt.image.Kernel;
import javax.swing.ImageIcon;
/**
* Class for providing generic image processing functions
*/
public abstract class ImageUtils
{
private static final float SMOOTH_FACTOR = 0.008f;
private static ConvolveOp CONVOLVER = null;
/** Static block for initialization */
static
{
float[] smoothMatrix = {
0, SMOOTH_FACTOR, 0,
SMOOTH_FACTOR, 1-(SMOOTH_FACTOR*4), SMOOTH_FACTOR,
0, SMOOTH_FACTOR, 0
};
CONVOLVER = new ConvolveOp(new Kernel(3, 3, smoothMatrix));
}
/**
* Create a scaled and smoothed image according to the specified size
* @param inImage image to scale
* @param inWidth width to scale to
* @param inHeight height to scale to
* @return BufferedImage containing scaled result
*/
public static BufferedImage createScaledImage(Image inImage, int inWidth, int inHeight)
{
// create smaller image and force its loading
Image smallerImage = inImage.getScaledInstance(inWidth, inHeight, Image.SCALE_SMOOTH);
Image tempImage = new ImageIcon(smallerImage).getImage();
tempImage.getWidth(null);
// create buffered image to do transform
BufferedImage buffer = new BufferedImage(inWidth, inHeight, BufferedImage.TYPE_INT_RGB);
// copy scaled picture into buffer
Graphics buffG = buffer.getGraphics();
buffG.drawImage(smallerImage, 0, 0, inWidth, inHeight, null);
buffG.dispose();
// clear variables
smallerImage = null; tempImage = null;
// smooth scaled image using a normalized 3x3 matrix - taking next neighbour
buffer = CONVOLVER.filter(buffer, null);
return buffer;
}
/**
* Work out the max size of a thumbnail
* @param inOrigWidth width of original picture
* @param inOrigHeight height of original picture
* @param inMaxWidth max width of thumbnail
* @param inMaxHeight max height of thumbnail
* @return size of thumbnail as Dimension
*/
public static Dimension getThumbnailSize(int inOrigWidth, int inOrigHeight, int inMaxWidth, int inMaxHeight)
{
if (inMaxWidth <= 0 || inMaxHeight <= 0) {return new Dimension(1, 1);}
// work out maximum zoom ratio available so that thumbnail isn't too big
double xZoom = inMaxWidth * 1.0 / inOrigWidth;
double yZoom = inMaxHeight * 1.0 / inOrigHeight;
double zoom = (xZoom > yZoom?yZoom:xZoom);
// Don't make thumbnail bigger than picture
if (zoom > 1.0) {return new Dimension(inOrigWidth, inOrigHeight);}
// calculate new width and height
final int xSize = (int) (zoom * inOrigWidth);
final int ySize = (int) (zoom * inOrigHeight);
if (xSize <= 0 || ySize <= 0) {return new Dimension(1, 1);}
return new Dimension (xSize, ySize);
}
/**
* Create a new image by rotating and scaling the given one
* @param inImage input image
* @param inMaxWidth maximum width of output image
* @param inMaxHeight maximum height of output image
* @param inRotationDegrees number of degrees to rotate clockwise (0, 90, 180 or 270)
* @return rotated, scaled image
*/
public static BufferedImage rotateImage(Image inImage, int inMaxWidth, int inMaxHeight, int inRotationDegrees)
{
// Create scaled image of suitable size
boolean isRotated = (inRotationDegrees % 180 != 0);
int origWidth = inImage.getWidth(null);
int origHeight = inImage.getHeight(null);
int thumbWidth = isRotated?origHeight:origWidth;
int thumbHeight = isRotated?origWidth:origHeight;
Dimension scaledSize = getThumbnailSize(thumbWidth, thumbHeight, inMaxWidth, inMaxHeight);
BufferedImage result = new BufferedImage(scaledSize.width, scaledSize.height, BufferedImage.TYPE_INT_RGB);
// Do different things according to rotation angle (a bit messy, sorry!)
if (inRotationDegrees == 0)
{
// Not rotated, so just copy image directly
result.getGraphics().drawImage(inImage, 0, 0, scaledSize.width, scaledSize.height, null);
}
else
{
// Need to use Graphics2D for rotation, not Graphics
Graphics2D g2d = result.createGraphics();
switch (inRotationDegrees)
{
case 90:
g2d.rotate(Math.PI / 2, 0.0, 0.0);
g2d.drawImage(inImage, 0, -scaledSize.width, scaledSize.height, scaledSize.width, null);
break;
case 180:
g2d.rotate(Math.PI, scaledSize.width/2.0, scaledSize.height/2.0);
g2d.drawImage(inImage, 0, 0, scaledSize.width, scaledSize.height, null);
break;
case 270:
g2d.rotate(Math.PI * 3/2, 0.0, 0.0);
g2d.drawImage(inImage, -scaledSize.height, 0, scaledSize.height, scaledSize.width, null);
}
// Clear up memory
g2d.dispose();
}
return result;
}
}
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