| gvSIG desktop 1

/*

 * Created on 16-feb-2005

 */

package org.gvsig.fmap.mapcontext.layers;

import java.awt.Rectangle;

import java.awt.geom.AffineTransform;

import java.awt.geom.NoninvertibleTransformException;

import java.awt.geom.Rectangle2D;

import org.gvsig.fmap.mapcontext.ViewPort;

/**

 * C?lculo de Partes (Tiles) en las que se divide un raster grande.

 * Se usa para imprimir rasters y capas raste remotas (WMS).

 * 

 * Para no pedir imagenes demasiado grandes, vamos

 * a hacer lo mismo que hace EcwFile: chunkear.

 * Llamamos a drawView con cuadraditos m?s peque?os

 * del BufferedImage ni caso, cuando se imprime viene con null

 * c?digo original de Fran Pe?arrubia

 * @author Luis W. Sevilla (sevilla_lui@gva.es)

 */

public class Tiling {

        private static final int                MIN_SIZE = 50; //Tama?o m?nimo en pixeles del tile

        private boolean                                 debug = true;

        private int                                         tileMaxWidth, tileMaxHeight;

        private int                                         numRows, numCols;

        private double[][]                                 srcPts;

        private Rectangle[]                         tile;

        private double                                         width = 500, height = 500;        

        private AffineTransform                 mat;

        private ViewPort                                 vp;

        public Tiling(){}

        public Tiling(int tileW, int tileH, Rectangle r) {

                int[] size = this.calcMaxTileSize(tileW, tileH, r);

                tileMaxWidth = size[0];

                tileMaxHeight = size[1];

        int stepX, stepY;

        int xProv, yProv;

        int altoAux, anchoAux;

        //Vamos a hacerlo en trozos de AxH

        numCols = 1+(int) (r.width) / tileMaxWidth;

        numRows = 1+(int) (r.height) / tileMaxHeight;

        srcPts = new double[numCols*numRows][8];

        tile = new Rectangle[numCols*numRows];

            yProv = (int) r.y;

        for (stepY=0; stepY < numRows; stepY++) {

                    if ((yProv + tileMaxHeight) > r.getMaxY()) 

                            altoAux = (int) r.getMaxY() - yProv;

                    else

                            altoAux = tileMaxHeight;

                    xProv = (int) r.x;

                for (stepX=0; stepX < numCols; stepX++) {                        

                            if ((xProv + tileMaxWidth) > r.getMaxX()) 

                                    anchoAux = (int) r.getMaxX() - xProv;

                            else

                                    anchoAux = tileMaxWidth;

                        //Rectangle newRect = new Rectangle(xProv, yProv, anchoAux, altoAux);

                        int tileCnt = stepY*numCols+stepX;

                        // Parte que dibuja

                        srcPts[tileCnt][0] = xProv;

                        srcPts[tileCnt][1] = yProv;

                        srcPts[tileCnt][2] = xProv + anchoAux+1;

                        srcPts[tileCnt][3] = yProv;

                        srcPts[tileCnt][4] = xProv + anchoAux+1;

                        srcPts[tileCnt][5] = yProv + altoAux+1;

                        srcPts[tileCnt][6] = xProv;

                        srcPts[tileCnt][7] = yProv + altoAux+1;

                        tile[tileCnt] = new Rectangle(xProv, yProv, anchoAux+1, altoAux+1);

                                xProv += tileMaxWidth;        

                }                        

                yProv += tileMaxHeight;

        }                  

        }

        /**

         * Calcula el tama?o m?ximo de tile controlando que ning?n tile tenga menos de MIN_SIZE

         * pixeles

         * @param tileW Ancho del tile

         * @param tileH        Alto del tile

         * @param r Rectangulo que define el area de la imagen

         */

        public int[] calcMaxTileSize(int tileW, int tileH, Rectangle r){

                if(r.width < tileW || r.height < tileH){

                        int[] sizeTiles = {tileW, tileH};

                        return sizeTiles;

                }

        int wLastCol = 0;

        tileW += MIN_SIZE;

                do{

                        tileW -= MIN_SIZE;

                int numCols = (int) (r.width / tileW);

                int w = 0;

                for(int i = 0; i < numCols; i++)

                        w += tileW;

                wLastCol = r.width - w;

                }while(wLastCol < MIN_SIZE && tileW > (MIN_SIZE * 2));

                int hLastRow = 0;

        tileH += MIN_SIZE;

                do{

                        tileH -= MIN_SIZE;

                int numRows = (int) (r.height / tileH);

                int h = 0;

                for(int i = 0; i < numRows; i++)

                        h += tileH;

                hLastRow = r.height - h;

                }while(hLastRow < MIN_SIZE && tileH > (MIN_SIZE * 2));

                tileMaxWidth = tileW;

                tileMaxHeight = tileH;

                int[] sizeTiles = {tileMaxWidth, tileMaxHeight};

                return sizeTiles;

        }

        public double [] getTilePts(int colNr, int rowNr) {

                return srcPts[rowNr*numCols+colNr];

        }

        public double [] getTilePts(int num) {

                return srcPts[num];

        }

        public Rectangle getTileSz(int colNr, int rowNr) {

                return tile[rowNr*numCols+colNr];

        }

        public Rectangle getTile(int num) {

                return tile[num];

        }

        /**

         * @return Returns the numCols.

         */

        public int getNumCols() {

                return numCols;

        }

        /**

         * @return Returns the numRows.

         */

        public int getNumRows() {

                return numRows;

        }

        public int getNumTiles() { return numRows*numCols; }

        /**

         * @return Returns the tileHeight.

         */

        public int getMaxTileHeight() {

                return tileMaxHeight;

        }

        /**

         * @return Returns the tileWidth.

         */

        public int getMaxTileWidth() {

                return tileMaxWidth;

        }

        ViewPort[] viewPortList = null;

        private void calcViewPort(ViewPort viewPort)throws NoninvertibleTransformException{

                viewPortList = new ViewPort[numCols*numRows];

                /*if(viewPort.getImageWidth() < width && viewPort.getImageHeight() < height){

                        viewPortList[0] = viewPort;

                        return;

                }*/

            int vpCnt = 0;

            double imgPxX = viewPort.getImageWidth();

            double dWcX = viewPort.getAdjustedExtent().getWidth();

            double tileWcW = (getTile(vpCnt).getSize().getWidth() * dWcX) / imgPxX;

            double imgPxY = viewPort.getImageHeight();

            double dWcY = viewPort.getAdjustedExtent().getHeight();

            double tileWcH = (getTile(vpCnt).getSize().getHeight() * dWcY) / imgPxY;

            viewPortList[0] = viewPort.cloneViewPort();

            viewPortList[0].setImageSize(getTile(vpCnt).getSize());

            viewPortList[0].setExtent(new Rectangle2D.Double(viewPort.getAdjustedExtent().getMinX(), viewPort.getAdjustedExtent().getMaxY() - tileWcH, tileWcW, tileWcH));

            viewPortList[0].setAffineTransform(mat);

            double wt = tileWcW;

            double ht = tileWcH;

            double xt = viewPort.getAdjustedExtent().getMinX();

            double yt = viewPort.getAdjustedExtent().getMaxY() - tileWcH;

            for (int stepY=0; stepY < numRows; stepY++) {

                    wt = tileWcW;

                    xt = viewPort.getAdjustedExtent().getMinX();

                    for (int stepX=0; stepX < numCols; stepX++) {

                            vpCnt = stepY*numCols+stepX;

                            if(vpCnt > 0){

                                    if(stepX > 0)

                                            xt += wt;

                                    if((xt + wt) > viewPort.getAdjustedExtent().getMaxX())

                                            wt = Math.abs(viewPort.getAdjustedExtent().getMaxX() - xt);

                                    viewPortList[vpCnt] = viewPort.cloneViewPort();

                                    viewPortList[vpCnt].setImageSize(getTile(vpCnt).getSize());

                                    viewPortList[vpCnt].setExtent(new Rectangle2D.Double(xt, yt, wt, ht));

                                    viewPortList[vpCnt].setAffineTransform(mat);

                            }

                            //System.out.println("ViewPort: "+vpCnt+" "+viewPortList[vpCnt].getAdjustedExtent()+" "+getTile(vpCnt).getSize());

                    }

                    if((yt - ht) < viewPort.getAdjustedExtent().getMinY()){

                            ht = Math.abs(yt - viewPort.getAdjustedExtent().getMinY());

                            yt = viewPort.getAdjustedExtent().getMinY();

                    }else

                            yt -= ht;

            }

        }

        public ViewPort getTileViewPort(ViewPort viewPort, int tileNr) throws NoninvertibleTransformException {

                /*if(viewPortList == null)

                        this.calcViewPort(viewPort);

                return viewPortList[tileNr];*/

                if(tile.length == 1)

                        return viewPort;

                double [] dstPts = new double[8];

                double [] srcPts = getTilePts(tileNr);

                Rectangle tile = getTile(tileNr);

                //Rectangle newRect = new Rectangle((int)srcPts[0], (int)srcPts[1], tileSz[0], tileSz[1]);

                mat.inverseTransform(srcPts, 0, dstPts, 0, 4);

                double x = dstPts[0], w = dstPts[2] - dstPts[0];

                double y = dstPts[1], h = dstPts[5] - dstPts[3];

                if (w < 0) { x = dstPts[2]; w = dstPts[0] - dstPts[2]; }

                if (h < 0) { y = dstPts[5]; h = dstPts[3] - dstPts[5]; }

                Rectangle2D.Double rectCuadricula = new Rectangle2D.Double(x, y, w, h); 

                //Extent extent = new Extent(rectCuadricula);

                ViewPort vp = viewPort.cloneViewPort();

                vp.setImageSize(tile.getSize());

                //vp.setOffset(tile.getLocation());

                vp.setExtent(rectCuadricula);

                vp.setAffineTransform(mat);

                if (debug)

                    System.out.println("Tiling.print(): tile "+tileNr+" de "

                            + getNumTiles() + 

                            "\n, Extent = "+vp.getAdjustedExtent() + " tile: "

                            + tile);

                return vp;

        }

        /**

         * @return Returns the mat.

         */

        public AffineTransform getAffineTransform() {

                return mat;

        }

        /**

         * @param mat The mat to set.

         */

        public void setAffineTransform(AffineTransform mat) {

                this.mat = mat;

        }

        /**

         * @return Returns the debug.

         */

        public boolean isDebug() {

                return debug;

        }

        /**

         * @param debug The debug to set.

         */

        public void setDebug(boolean debug) {

                this.debug = debug;

        }

}