+++ /dev/null
-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)
- {
- if (inWidth <= 0 || inHeight <= 0) {
- return null;
- }
- // 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;
- }
-}
projects / GpsPrune.git / blobdiff