1 | package org.nzdl.gsdl.GsdlCollageApplet;
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2 |
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3 | import java.awt.*;
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4 | import java.awt.geom.*;
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5 | import java.io.*;
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6 | import java.net.*;
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7 |
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8 | /**
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9 | * @author Katrina Edgar
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10 | * @author David Bainbridge
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11 | *
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12 | * Data Structure to store an image once it is displayed in the applet.
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13 | * This structure remembers the images graphical representation, source url,
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14 | * name, width, height, position on the screen and whether or not it has
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15 | * previously been displayed. It provides methods to set the dimensions and
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16 | * position of the image. It also provides access methods to the translated
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17 | * x and y co-ordinates of the image */
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18 | public class CollageImage {
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19 |
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20 | /** Graphical representation of the image */
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21 | Image image_ = null;
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22 | /** Source url of the image */
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23 | String from_url_ = null;
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24 | /** Name of the image */
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25 | String name_ = null;
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26 | /** Width of the image */
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27 | int image_x_dim_ = 0;
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28 | /** Height of the image */
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29 | int image_y_dim_ = 0;
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30 | /** Indicates whether or not the image has been drawn on the applet previously */
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31 | boolean fresh = true;
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32 |
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33 | URL url_ = null;
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34 |
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35 | /** Reflects the translation of the image from the origin to its position on the screen */
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36 | AffineTransform af_ = null;
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37 | /** Left x co-ordinate */
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38 | protected int xl_ = 0;
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39 | /** Top y co-ordinate */
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40 | protected int yt_ = 0;
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41 | /** Right x co-ordinate */
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42 | protected int xr_ = 0;
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43 | /** Bottom y co-ordinate */
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44 | protected int yb_ = 0;
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45 |
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46 | /** Constructs an CollageImage from the three specified parameters
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47 | *
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48 | * @param image The graphical representation of the image
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49 | * @param from_url The source url for the image
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50 | * @param name The file name of the image */
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51 | public CollageImage(Image image, URL url, String from_url, String name)
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52 | {
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53 | image_ = image;
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54 | from_url_ = from_url;
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55 | url_ = url;
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56 | name_ = name;
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57 | }
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58 |
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59 | /** Sets the width and height of the image
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60 | *
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61 | * @param x_dim The new width of the image
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62 | * @param y_dim The new height of the image */
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63 | public void setDimensions(int x_dim, int y_dim)
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64 | {
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65 | image_x_dim_ = x_dim;
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66 | image_y_dim_ = y_dim;
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67 | }
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68 |
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69 | /** Sets the translation for the image from the origin
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70 | * And regenerate the image as the scaled version
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71 | *
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72 | * @param af The AffineTransform translation that has been calculated */
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73 | public void setAffineTransform(MyAffineTransform af, boolean is_java2_)
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74 | {
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75 | image_x_dim_ = (int) (image_x_dim_ * af.scaleX);
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76 | image_y_dim_ = (int) (image_y_dim_ * af.scaleY);
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77 | image_ = image_.getScaledInstance(image_x_dim_, image_y_dim_, Image.SCALE_DEFAULT);
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78 |
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79 | if (is_java2_) {
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80 | af_ = new AffineTransform();
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81 | af_.translate(af.translateX, af.translateY);
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82 | af_.scale(1.0, 1.0);
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83 |
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84 | calculate_rect();
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85 | }
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86 | else {
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87 | double trans_x = af.translateX;
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88 | double trans_y = af.translateY;
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89 |
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90 | xl_ = Math.round((float)trans_x);
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91 | xr_ = Math.round((float)(trans_x + image_x_dim_)) -1;
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92 | yt_ = Math.round((float)trans_y);
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93 | yb_ = Math.round((float)(trans_y + image_y_dim_)) -1;
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94 | }
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95 | }
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96 |
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97 | public void expand () {
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98 |
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99 | // still expands a little too fast... how to fix this?
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100 | magnify(new Rectangle((int) (xl_ + (image_x_dim_ * 0.000001)),
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101 | (int) (yt_ + (image_y_dim_ * 0.000001)),
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102 | (int) (image_x_dim_ * 0.999998),
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103 | (int) (image_y_dim_ * 0.999998)));
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104 |
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105 | }
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106 |
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107 | public void magnify(Rectangle border) {
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108 |
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109 | double magX = image_x_dim_/(double)border.width;
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110 | double magY = image_y_dim_/(double)border.height;
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111 | int x = border.x + border.width/2;
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112 | int y = border.y + border.height/2;
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113 | paintImage(x,y,magX, magY);
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114 | }
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115 |
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116 | public void paintImage(int magCenterX, int magCenterY, double magX, double magY){
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117 |
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118 | try {
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119 | //Point2D mgp = null;
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120 | //mgp = af_.inverseTransform((new Point(magCenterX, magCenterY)),(Point)mgp);
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121 | //double x = (mgp.getX()*magX)-mgp.getX();
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122 | //double y = (mgp.getY()*magY)-mgp.getY();
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123 | //scale(-x,-y, magX, magY);
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124 | }catch (Exception e) {System.out.println(e); }
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125 | }
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126 |
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127 | public void scale(double magOffsetX, double magOffsetY, double magX, double magY){
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128 |
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129 | af_.translate(magOffsetX,magOffsetY);
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130 | af_.scale(magX, magY);
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131 | }
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132 |
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133 | /** Calculates the new image co-ordinates after translation has occurred */
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134 | protected void calculate_rect()
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135 | {
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136 | double trans_x = af_.getTranslateX();
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137 | double trans_y = af_.getTranslateY();
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138 |
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139 | xl_ = Math.round((float)trans_x);
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140 | xr_ = Math.round((float)(trans_x + image_x_dim_)) -1;
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141 | yt_ = Math.round((float)trans_y);
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142 | yb_ = Math.round((float)(trans_y + image_y_dim_)) -1;
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143 | }
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144 |
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145 | /** Determines whether a given co-ordinate is inside this image
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146 | *
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147 | * @param x The x co-ordinate
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148 | * @param y The y co-ordinate */
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149 | public boolean inside(int x, int y)
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150 | {
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151 | return ((x>=xl_) && (x<=xr_)) && ((y>=yt_) && (y<=yb_));
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152 | }
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153 |
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154 | /** Gets the width of the translated image */
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155 | public double getX() {
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156 | return af_.getTranslateX();
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157 | }
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158 |
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159 | /** Gets the height of the translated image */
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160 | public double getY() {
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161 | return af_.getTranslateY();
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162 | }
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163 | }
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164 |
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