parallel/util/PartitionUtil.java

package appl.parallel.util;

import java.awt.Rectangle;
import java.awt.image.DataBuffer;

import schmitzm.data.WritableGrid;
import schmitzm.data.WritableGridArray;
import appl.parallel.data.WritableGridArrayPartition;
import appl.parallel.spmd.split.SplittableResource;
import appl.parallel.spmd.split.WritableGridPartition;
import appl.util.RasterMetaData;

/**
 * See method description for details.
 * 
 * @author Dominik Appl
 */
public class PartitionUtil {

        /**
                 * Returns partition of a {@link WritableGrid} as a {@link WritableGridArray}.
                 * Notice, that the minX and minY values are ignored and will be set to 0
                 * (see {@link WritableGrid} for more information about minX and minY). If
                 * the given {@link WritableGrid} is not an instance of
                 * {@link WritableGridPartition} it is assumed that the topLeft corner of
                 * the source grid is (0,0) (like in standard image processing).<br>
                 * If the partition is a {@link WritableGridPartition} it is assumed that
                 * the the bounds of the two Partition refer to the same coordinate system.
                 * Real coordinates are supposed to reference the South(!)-West Corner.
                 * 
                 * @param sourceGrid
                 *            the grid to be partitioned
                 * @param partitionBounds
                 *            the rectangle describing the partition
                 * @param rootID
                 *            the id to identify the root partition
                 * @return the new partition including the given corners
                 * @see SplittableResource#getRootID()
                 */
                public static WritableGridPartition getPartitialGrid2D(WritableGrid sourceGrid,
                                Rectangle partitionBounds, int rootID) {
                        
        //                              (int) partitionBounds.getX(),
        //                              (int) partitionBounds.getY(),
        //                              (int) (partitionBounds.getX() + partitionBounds.getWidth() - 1),
        //                              (int) (partitionBounds.getY() + partitionBounds.getHeight() - 1));
                        
        //              get Metadata of the big Grid
                        RasterMetaData bigMeta = new RasterMetaData(sourceGrid);
        
                        //create MetaData for the new partitial Grid
                        //Height an width of the partitial Grid
                        int pHeight = (int) partitionBounds.getHeight();
                        int pWidth = (int)partitionBounds.getWidth();
        
                        //real coordinates of the partitial Grid (which are referenced by the SW Corner)
                        double pX = partitionBounds.getX() * bigMeta.getCellWidth() + bigMeta.getX();
                        double pY = (partitionBounds.getY() + partitionBounds.getHeight() - 1) * bigMeta.getCellHeight() + bigMeta.getY();
                        double pRealWidth = pWidth * bigMeta.getCellWidth();
                        double pRealHeight = pHeight * bigMeta.getCellHeight();
        
                        //the MetaData of the new Grid
                        RasterMetaData pMetaData = new RasterMetaData(bigMeta.getDataType(),
                                        pWidth, pHeight, 0, 0, pX, pY, pRealWidth, pRealHeight, bigMeta.getCoordinateReferenceSystem());
        
                        //create empty return Grid
                        WritableGridPartition pGrid;
                        switch(bigMeta.getDataType()){
                        case DataBuffer.TYPE_INT:
                                pGrid = new WritableGridArrayPartition.Integer(pMetaData,rootID,partitionBounds);       
                                break;
                        case DataBuffer.TYPE_DOUBLE:
                                pGrid = new WritableGridArrayPartition.Double(pMetaData,rootID,partitionBounds);
                                break;
                        default:
                                pGrid = new WritableGridArrayPartition.Float(pMetaData,rootID,partitionBounds); 
                        }
                        
                        //if the sourceGrid is a partition itself then we do not want to to start reading from (0,0)
                        //but shifted relative to the global coordinate system. So we calculate now the start values:
                        
                        //for standard WritableGrids these are simply the bounds of the new partition...
                        int startX = (int) partitionBounds.getX();
                        int startY = (int) partitionBounds.getY();
                        
                        // ...but for partitions these values are shifted:
                        if(sourceGrid instanceof WritableGridPartition){
                                Rectangle srcBounds = ((WritableGridPartition) sourceGrid).getPartitionBounds();
                                startX -= srcBounds.getX();
                                startY -= srcBounds.getY();
                        }
                        //read the data into the raster from left to right and downwards
                        int x=0,y=0;
                        try{
                        for (y = 0; y < pHeight; y++)
                                for (x = 0; x < pWidth; x++)
                                        pGrid.setRasterSample(
                                                        sourceGrid.getRasterSample(startX  + x, startY + y),
                                                        x, 
                                                        y);
                        }catch (Exception e) {
                                System.out.println("stop");
                        }
                        return pGrid;
                }

        /**
             * Overwrites the data at the location specified by the {@link Rectangle} with
             * the given partition-data. If the given baseGrid is NOT an instance
                 * of {@link WritableGridPartition} it is assumed that its the topLeft corner (0,0). 
                 * If it IS a {@link WritableGridPartition} it is assumed that the the
                 * bounds of the two Partition refer to the same coordinate system and the partition
                 * is inserted at the correct absolut position.
             * 
                 * @param baseGrid the grid in which the data is inserted
                 * @param gridPartition the grid to be inserted
                 * @param partitionBounds the excact location in coordinates of the baseGrid
                 */
                public static void setPartition(WritableGrid baseGrid, WritableGrid gridPartition, Rectangle partitionBounds) {
                        //Check if partition and the rectangle fit
                        if((gridPartition.getWidth()!=partitionBounds.getWidth()) ||
                                        (gridPartition.getHeight()!=partitionBounds.getHeight()))
                          throw new UnsupportedOperationException("The partition width/height does not match the rectangle width/height");
                        
                        //if the baseeGrid is a partition itself then we do not want to to start writing from (0,0)
                        //but shifted relative to the global coordinate system. So we calculate now the start values:
                        
                        //for standard WritableGrids these are simply the bounds of the new partition...
                        int startX = (int) partitionBounds.getX();
                        int startY = (int) partitionBounds.getY();
                        
                        // ...but for partitions these values are shifted:
                        if(baseGrid instanceof WritableGridPartition){
                                Rectangle targetBounds = ((WritableGridPartition) baseGrid).getPartitionBounds();
                                startX -= targetBounds.getX();
                                startY -= targetBounds.getY();
                        }
                        //check if the partition fits in
        //              if(((partitionBounds.getX()+partitionBounds.getWidth()-1)>baseGrid.getWidth()  ||
        //                              (partitionBounds.getY()+partitionBounds.getHeight()-1)>baseGrid.getHeight()))
        //                              System.out.println("X");
                                //throw new UnsupportedOperationException("The partition does not fit in the Grid!");
                        //write the partition into the Grid
                        
                        for(int y = 0; y < partitionBounds.getHeight();y++)
                                for(int x = 0; x < partitionBounds.getWidth(); x++)
                                        baseGrid.setRasterSample(
                                                                                        gridPartition.getRasterSample(x,y),
                                                                                        x + startX, 
                                                                                        y + startY);
                        
                }

}
1	package appl.parallel.util;
2
3	import java.awt.Rectangle;
4	import java.awt.image.DataBuffer;
5
6	import schmitzm.data.WritableGrid;
7	import schmitzm.data.WritableGridArray;
8	import appl.parallel.data.WritableGridArrayPartition;
9	import appl.parallel.spmd.split.SplittableResource;
10	import appl.parallel.spmd.split.WritableGridPartition;
11	import appl.util.RasterMetaData;
12
13	/**
14	* See method description for details.
15	*
16	* @author Dominik Appl
17	*/
18	public class PartitionUtil {
19
20	/**
21	* Returns partition of a {@link WritableGrid} as a {@link WritableGridArray}.
22	* Notice, that the minX and minY values are ignored and will be set to 0
23	* (see {@link WritableGrid} for more information about minX and minY). If
24	* the given {@link WritableGrid} is not an instance of
25	* {@link WritableGridPartition} it is assumed that the topLeft corner of
26	* the source grid is (0,0) (like in standard image processing).<br>
27	* If the partition is a {@link WritableGridPartition} it is assumed that
28	* the the bounds of the two Partition refer to the same coordinate system.
29	* Real coordinates are supposed to reference the South(!)-West Corner.
30	*
31	* @param sourceGrid
32	* the grid to be partitioned
33	* @param partitionBounds
34	* the rectangle describing the partition
35	* @param rootID
36	* the id to identify the root partition
37	* @return the new partition including the given corners
38	* @see SplittableResource#getRootID()
39	*/
40	public static WritableGridPartition getPartitialGrid2D(WritableGrid sourceGrid,
41	Rectangle partitionBounds, int rootID) {
42
43	// (int) partitionBounds.getX(),
44	// (int) partitionBounds.getY(),
45	// (int) (partitionBounds.getX() + partitionBounds.getWidth() - 1),
46	// (int) (partitionBounds.getY() + partitionBounds.getHeight() - 1));
47
48	// get Metadata of the big Grid
49	RasterMetaData bigMeta = new RasterMetaData(sourceGrid);
50
51	//create MetaData for the new partitial Grid
52	//Height an width of the partitial Grid
53	int pHeight = (int) partitionBounds.getHeight();
54	int pWidth = (int)partitionBounds.getWidth();
55
56	//real coordinates of the partitial Grid (which are referenced by the SW Corner)
57	double pX = partitionBounds.getX() * bigMeta.getCellWidth() + bigMeta.getX();
58	double pY = (partitionBounds.getY() + partitionBounds.getHeight() - 1) * bigMeta.getCellHeight() + bigMeta.getY();
59	double pRealWidth = pWidth * bigMeta.getCellWidth();
60	double pRealHeight = pHeight * bigMeta.getCellHeight();
61
62	//the MetaData of the new Grid
63	RasterMetaData pMetaData = new RasterMetaData(bigMeta.getDataType(),
64	pWidth, pHeight, 0, 0, pX, pY, pRealWidth, pRealHeight, bigMeta.getCoordinateReferenceSystem());
65
66	//create empty return Grid
67	WritableGridPartition pGrid;
68	switch(bigMeta.getDataType()){
69	case DataBuffer.TYPE_INT:
70	pGrid = new WritableGridArrayPartition.Integer(pMetaData,rootID,partitionBounds);
71	break;
72	case DataBuffer.TYPE_DOUBLE:
73	pGrid = new WritableGridArrayPartition.Double(pMetaData,rootID,partitionBounds);
74	break;
75	default:
76	pGrid = new WritableGridArrayPartition.Float(pMetaData,rootID,partitionBounds);
77	}
78
79	//if the sourceGrid is a partition itself then we do not want to to start reading from (0,0)
80	//but shifted relative to the global coordinate system. So we calculate now the start values:
81
82	//for standard WritableGrids these are simply the bounds of the new partition...
83	int startX = (int) partitionBounds.getX();
84	int startY = (int) partitionBounds.getY();
85
86	// ...but for partitions these values are shifted:
87	if(sourceGrid instanceof WritableGridPartition){
88	Rectangle srcBounds = ((WritableGridPartition) sourceGrid).getPartitionBounds();
89	startX -= srcBounds.getX();
90	startY -= srcBounds.getY();
91	}
92	//read the data into the raster from left to right and downwards
93	int x=0,y=0;
94	try{
95	for (y = 0; y < pHeight; y++)
96	for (x = 0; x < pWidth; x++)
97	pGrid.setRasterSample(
98	sourceGrid.getRasterSample(startX + x, startY + y),
99	x,
100	y);
101	}catch (Exception e) {
102	System.out.println("stop");
103	}
104	return pGrid;
105	}
106
107	/**
108	* Overwrites the data at the location specified by the {@link Rectangle} with
109	* the given partition-data. If the given baseGrid is NOT an instance
110	* of {@link WritableGridPartition} it is assumed that its the topLeft corner (0,0).
111	* If it IS a {@link WritableGridPartition} it is assumed that the the
112	* bounds of the two Partition refer to the same coordinate system and the partition
113	* is inserted at the correct absolut position.
114	*
115	* @param baseGrid the grid in which the data is inserted
116	* @param gridPartition the grid to be inserted
117	* @param partitionBounds the excact location in coordinates of the baseGrid
118	*/
119	public static void setPartition(WritableGrid baseGrid, WritableGrid gridPartition, Rectangle partitionBounds) {
120	//Check if partition and the rectangle fit
121	if((gridPartition.getWidth()!=partitionBounds.getWidth()) \|\|
122	(gridPartition.getHeight()!=partitionBounds.getHeight()))
123	throw new UnsupportedOperationException("The partition width/height does not match the rectangle width/height");
124
125	//if the baseeGrid is a partition itself then we do not want to to start writing from (0,0)
126	//but shifted relative to the global coordinate system. So we calculate now the start values:
127
128	//for standard WritableGrids these are simply the bounds of the new partition...
129	int startX = (int) partitionBounds.getX();
130	int startY = (int) partitionBounds.getY();
131
132	// ...but for partitions these values are shifted:
133	if(baseGrid instanceof WritableGridPartition){
134	Rectangle targetBounds = ((WritableGridPartition) baseGrid).getPartitionBounds();
135	startX -= targetBounds.getX();
136	startY -= targetBounds.getY();
137	}
138	//check if the partition fits in
139	// if(((partitionBounds.getX()+partitionBounds.getWidth()-1)>baseGrid.getWidth() \|\|
140	// (partitionBounds.getY()+partitionBounds.getHeight()-1)>baseGrid.getHeight()))
141	// System.out.println("X");
142	//throw new UnsupportedOperationException("The partition does not fit in the Grid!");
143	//write the partition into the Grid
144
145	for(int y = 0; y < partitionBounds.getHeight();y++)
146	for(int x = 0; x < partitionBounds.getWidth(); x++)
147	baseGrid.setRasterSample(
148	gridPartition.getRasterSample(x,y),
149	x + startX,
150	y + startY);
151
152	}
153
154	}