sascha@422: package de.intevation.gnv.jfreechart;
sascha@422: 
sascha@422: import java.io.Serializable;
sascha@422: 
sascha@422: /**
ingo@795:  * This class is used to represent geometries (e.g. point, line, polygon). Each
ingo@795:  * geometry is made up of multiple xy points stored in a single array. A line
ingo@795:  * composed by start- and endpoint is stored in the following order in that
ingo@795:  * array: [x1, y1, x2, y2].
ingo@795:  *
sascha@780:  * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha Teichmann</a>
sascha@780:  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
sascha@422:  */
sascha@422: public class CompactXYItems
sascha@422: implements   Serializable
sascha@422: {
ingo@795:     /**
ingo@795:      * Array storing the xy items.
ingo@795:      */
sascha@422:     protected double [] data;
sascha@422: 
ingo@795:     /**
ingo@795:      * Constructs a new CompactXYItems object with the given data.
ingo@795:      *
ingo@795:      * @param data An array with xy values.
ingo@795:      */
sascha@422:     public CompactXYItems(double [] data) {
sascha@422:         this.data = data;
sascha@422:     }
sascha@422: 
ingo@795:     /**
ingo@795:      * Retrieves the x coordinate of the point with the given index.
ingo@795:      *
ingo@795:      * @param index Index
ingo@795:      * @return X coordinate.
ingo@795:      */
sascha@422:     public double getX(int index) {
sascha@422:         return data[index << 1];
sascha@422:     }
sascha@422: 
ingo@795:     /**
ingo@795:      * Retrieves the y coordinate of the point with the given index.
ingo@795:      *
ingo@795:      * @param index Index
ingo@795:      * @return Y coordinate.
ingo@795:      */
sascha@422:     public double getY(int index) {
sascha@422:         return data[(index << 1)+1];
sascha@422:     }
sascha@422: 
ingo@795:     /**
ingo@795:      * Write the tupel of xy-values at a specific index into the given array.
ingo@795:      *
ingo@795:      * @param index Index used to specify the xy-value.
ingo@795:      * @param xy the xy coordinate is written into this array with the following
ingo@795:      * order: [x,y]
ingo@795:      */
sascha@422:     public void get(int index, double [] xy) {
sascha@422:         xy[0] = data[index = (index << 1) + 1];
sascha@422:         xy[1] = data[index + 1];
sascha@422:     }
sascha@422: 
ingo@795:     /**
ingo@795:      *
ingo@795:      * @return the data array.
ingo@795:      */
sascha@422:     public double [] getData() {
sascha@422:         return data;
sascha@422:     }
sascha@422: 
ingo@795:     /**
ingo@795:      *
ingo@795:      * @param data
ingo@795:      */
sascha@422:     public void setData(double [] data) {
sascha@422:         this.data = data;
sascha@422:     }
sascha@422: 
ingo@795:     /**
ingo@795:      *
ingo@795:      * @return
ingo@795:      */
sascha@422:     public int size() {
sascha@422:         return data.length >> 1;
sascha@422:     }
sascha@422: 
ingo@795:     /**
ingo@795:      * Retrieves the bounding box spaned by the coordinates in the data array.
ingo@795:      *
ingo@795:      * @param bbox
ingo@795:      * @return
ingo@795:      */
sascha@422:     public double [] calculateBoundingBox(double [] bbox)  {
sascha@422:         for (int i = 0; i < data.length;) {
sascha@422:             double x = data[i++];
sascha@422:             double y = data[i++];
sascha@422:             if (x < bbox[0]) bbox[0] = x;
sascha@422:             if (y < bbox[1]) bbox[1] = y;
sascha@422:             if (x > bbox[2]) bbox[2] = x;
sascha@422:             if (y > bbox[3]) bbox[3] = y;
sascha@422:         }
sascha@422:         return bbox;
sascha@422:     }
sascha@422: 
ingo@795:     /**
ingo@795:      *
ingo@795:      * @return the coordinates as string.
ingo@795:      */
ingo@795:     @Override
sascha@422:     public String toString() {
sascha@422:         StringBuilder sb = new StringBuilder();
sascha@422:         for (int i = 0; i < data.length;) {
sascha@422:             if (i > 0) sb.append("; ");
sascha@422:             sb.append('(');
sascha@422:             sb.append(data[i++]);
sascha@422:             sb.append(", ");
sascha@422:             sb.append(data[i++]);
sascha@422:             sb.append(')');
sascha@422:         }
sascha@422:         return sb.toString();
sascha@422:     }
sascha@422: 
sascha@422: 
ingo@795:     /**
ingo@795:      *
ingo@795:      * @return the lowest x value.
ingo@795:      */
sascha@422:     public double getMinX() {
sascha@422:         double lower = Double.POSITIVE_INFINITY;
sascha@422: 
sascha@422:         for (int i = 0; i < data.length; i += 2) {
sascha@422:             double x = data[i];
sascha@422: 
sascha@422:             if (!Double.isNaN(x)) {
sascha@422:                 lower = Math.min(lower, x);
sascha@422:             }
sascha@422:         }
sascha@422: 
sascha@422:         return lower;
sascha@422:     }
sascha@422: 
sascha@422: 
ingo@795:     /**
ingo@795:      *
ingo@795:      * @return the highest x value.
ingo@795:      */
sascha@422:     public double getMaxX() {
sascha@422:         double upper = Double.NEGATIVE_INFINITY;
sascha@422: 
sascha@422:         for (int i = 0; i < data.length; i += 2) {
sascha@422:             double x = data[i];
sascha@422: 
sascha@422:             if (!Double.isNaN(x)) {
sascha@422:                 upper = Math.max(upper, x);
sascha@422:             }
sascha@422:         }
sascha@422: 
sascha@422:         return upper;
sascha@422:     }
sascha@422: 
sascha@422: 
ingo@795:     /**
ingo@795:      *
ingo@795:      * @return the lowest y value.
ingo@795:      */
sascha@422:     public double getMinY() {
sascha@422:         double lower = Double.POSITIVE_INFINITY;
sascha@422: 
sascha@422:         for (int i = 1; i < data.length; i += 2) {
sascha@422:             double y = data[i];
sascha@422: 
sascha@422:             if (!Double.isNaN(y)) {
sascha@422:                 lower = Math.min(lower, y);
sascha@422:             }
sascha@422:         }
sascha@422: 
sascha@422:         return lower;
sascha@422:     }
sascha@422: 
sascha@422: 
ingo@795:     /**
ingo@795:      *
ingo@795:      * @return the highest y value.
ingo@795:      */
sascha@422:     public double getMaxY() {
sascha@422:         double upper = Double.NEGATIVE_INFINITY;
sascha@422: 
sascha@422:         for (int i = 1; i < data.length; i += 2) {
sascha@422:             double y = data[i];
sascha@422: 
sascha@422:             if (!Double.isNaN(y)) {
sascha@422:                 upper = Math.max(upper, y);
sascha@422:             }
sascha@422:         }
sascha@422: 
sascha@422:         return upper;
sascha@422:     }
sascha@422: }
ingo@795: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :