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comparison servlet/src/digilib/image/DocuImageImpl.java @ 79:63c8186455c1

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Servlet version 1.6b. Further cleanup and new functionality: * mirroring * contrast/brightness * rotation (not finished)
author robcast
date Mon, 03 Feb 2003 16:04:53 +0100
parents 3b8797fc3e90
children 4e6757e8ccd4
comparison
equal deleted inserted replaced
78:e0dcac9c66fa 79:63c8186455c1
18 18
19 */ 19 */
20 20
21 package digilib.image; 21 package digilib.image;
22 22
23 import java.io.*; 23 import digilib.Utils;
24 import javax.servlet.ServletResponse;
25
26 import digilib.*;
27 import digilib.io.*;
28 24
29 /** Simple abstract implementation of the <code>DocuImage</code> interface. 25 /** Simple abstract implementation of the <code>DocuImage</code> interface.
30 * 26 *
31 * This implementation provides basic functionality for the utility methods like 27 * This implementation provides basic functionality for the utility methods like
32 * <code>SetUtils</code>, and <code>getKnownFileTypes</code>. Image methods like 28 * <code>SetUtils</code>, and <code>getKnownFileTypes</code>. Image methods like
33 * <code>loadImage</code>, <code>writeImage</code>, <code>getWidth</code>, 29 * <code>loadImage</code>, <code>writeImage</code>, <code>getWidth</code>,
34 * <code>getHeight</code> and <code>cropAndScale</code> must be implemented by 30 * <code>getHeight</code>, <code>crop</code> and <code>scale</code> must be
35 * derived classes. 31 * implemented by derived classes.
36 */ 32 */
37 public abstract class DocuImageImpl implements DocuImage { 33 public abstract class DocuImageImpl implements DocuImage {
38 34
39 /** Internal utils object. */ 35 /** Internal utils object. */
40 protected Utils util = null; 36 protected Utils util = null;
41 37
42 /** Default constructor. */ 38 /** Interpolation quality. */
43 public DocuImageImpl() { 39 protected int quality = 0;
44 util = new Utils();
45 }
46 40
47 /** Contructor taking an utils object. 41 /** Default constructor. */
48 * 42 public DocuImageImpl() {
49 * @param u Utils object. 43 util = new Utils();
50 */ 44 }
51 public DocuImageImpl(Utils u) {
52 util = u;
53 }
54 45
55 /** Set local Utils object. 46 /** Contructor taking an utils object.
56 * 47 *
57 * @param u Utils object. 48 * @param u Utils object.
58 */ 49 */
59 public void setUtils(Utils u) { 50 public DocuImageImpl(Utils u) {
60 util = u; 51 util = u;
61 } 52 }
62 53
63 /** Internal knownFileTypes. */ 54 /** Set local Utils object.
64 protected String[] knownFileTypes = {"jpg", "png", "gif", "tiff"}; 55 *
56 * @param u Utils object.
57 */
58 public void setUtils(Utils u) {
59 util = u;
60 }
65 61
66 /** Returns the list of image file types known to the DocuImage implementation. 62 /** Internal knownFileTypes. */
67 * 63 protected String[] knownFileTypes = { "jpg", "png", "gif", "tiff" };
68 * @return List of image file types. Strings are standard file extensions.
69 */
70 public String[] getKnownFileTypes() {
71 return knownFileTypes;
72 }
73 64
65 /** Returns the list of image file types known to the DocuImage implementation.
66 *
67 * @return List of image file types. Strings are standard file extensions.
68 */
69 public String[] getKnownFileTypes() {
70 return knownFileTypes;
71 }
74 72
75 public abstract void loadImage(File f) throws FileOpException; 73 /**
76 public abstract void writeImage(String mt, ServletResponse res) throws FileOpException; 74 * Returns the quality.
77 public abstract int getWidth(); 75 * @return int
78 public abstract int getHeight(); 76 */
79 public abstract void cropAndScale(int x_off, int y_off, int width, int height, float scale, int qual) throws ImageOpException; 77 public int getQuality() {
78 return quality;
79 }
80
81 /**
82 * Sets the quality.
83 * @param quality The quality to set
84 */
85 public void setQuality(int quality) {
86 this.quality = quality;
87 }
88
89 /** Crop and scale the current image.
90 *
91 * The current image is cropped to a rectangle of width, height at position
92 * x_off, y_off. The resulting image is scaled by the factor scale using the
93 * interpolation quality qual (0=worst).
94 *
95 * @param x_off X offset of the crop rectangle in pixel.
96 * @param y_off Y offset of the crop rectangle in pixel.
97 * @param width Width of the crop rectangle in pixel.
98 * @param height Height of the crop rectangle in pixel.
99 * @param scale Scaling factor.
100 * @param qual Interpolation quality (0=worst).
101 * @throws ImageOpException Exception thrown on any error.
102 */
103 public void cropAndScale(
104 int x_off, int y_off, int width, int height, double scale, int qual)
105 throws ImageOpException {
106
107 setQuality(qual);
108 crop(x_off, y_off, width, height);
109 scale(scale);
110 }
111
112 public void rotate(double angle) throws ImageOpException {
113 // just a do-nothing implementation
114 }
115
116 public void mirror(double angle) throws ImageOpException {
117 // just a do-nothing implementation
118 }
119
120 public void enhance(double mult, double add) throws ImageOpException {
121 // just a do-nothing implementation
122 }
123
80 } 124 }