org.ejml.dense.row.DMatrixComponent Maven / Gradle / Ivy
/*
* Copyright (c) 2009-2017, Peter Abeles. All Rights Reserved.
*
* This file is part of Efficient Java Matrix Library (EJML).
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.ejml.dense.row;
import org.ejml.data.DMatrixD1;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
/**
* Renders a matrix as an image. Positive elements are shades of red, negative shades of blue, 0 is black.
*
* @author Peter Abeles
*/
public class DMatrixComponent extends JPanel {
BufferedImage image;
public DMatrixComponent(int width , int height ) {
image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
setPreferredSize(new Dimension(width,height));
setMinimumSize(new Dimension(width,height));
}
public synchronized void setMatrix( DMatrixD1 A ) {
double maxValue = CommonOps_DDRM.elementMaxAbs(A);
renderMatrix(A,image,maxValue);
repaint();
}
public static void renderMatrix(DMatrixD1 M , BufferedImage image , double maxValue )
{
int w = image.getWidth();
int h = image.getHeight();
double widthStep = (double)M.numCols / image.getWidth();
double heightStep = (double)M.numRows / image.getHeight();
for( int i = 0; i < h; i++ ) {
for( int j = 0; j < w; j++ ) {
double value = M.get( (int)(i*heightStep) , (int)(j*widthStep) );
if( value == 0 ){
image.setRGB(j,i,255 << 24);
} else if( value > 0 ) {
int p = 255-(int)(255.0*(value/maxValue));
int rgb = 255 << 24 | 255 << 16 | p << 8 | p;
image.setRGB(j,i,rgb);
} else {
int p = 255+(int)(255.0*(value/maxValue));
int rgb = 255 << 24 | p << 16 | p << 8 | 255;
image.setRGB(j,i,rgb);
}
}
}
}
@Override
public synchronized void paint( Graphics g ) {
g.drawImage(image,0,0,this);
}
}