Class DataRaster

src/org/opensourcephysics/display2d/DataRaster.java:28–368

DataRaster maps (x,y) data onto an image. The image has the same size as the data panel. Every data point renders itself as one pixel. @author Wolfgang Christian @version 1.0

 * @version 1.0
 */
public class DataRaster implements Measurable {
	
	// BH 2020.03.04 Modified to be more efficient with setting image pixels
	// never used?
  /**
   * The drawing panel  that determines the image size.
   */
  DrawingPanel primaryDrawingPanel = null;
  
  public DrawingPanel getDrawingPanel() {
	  return primaryDrawingPanel;
  }
  
  Color backgroundColor;
  ArrayList<ImageData> imageDatasets = new ArrayList<ImageData>();
  boolean visible = true;
  protected double xmin = -1;
  protected double xmax = 1;
  protected double ymin = -1;
  protected double ymax = 1;
  private double xrange, yrange;
  //private int alpha = 255;         // the alpha value for the image
  private BufferedImage image;
  int[] pixels;
  int imageWidth, imageHeight;
  protected int maxPoints = 0x2ffff; // the maximum number of points that will be saved as image data.
  double xppu = 0;                   // x pixels per unit during last drawing
  double yppu = 0;
  double xMin, yMax; // based on panel

	/**
	 * Constructs a DataRaster object that maps (x,y) data to image pixels.
	 *
	 * @param dp    the drawing panel that will be used to calculate the image size
	 * @param _xmin the mininum x value that can be mapped
	 * @param _xmax the maximum x value that can be mapped
	 * @param _ymin the mininum y value that can be mapped
	 * @param _ymax the maximum y value that can be mapped
	 */
	public DataRaster(DrawingPanel dp, double _xmin, double _xmax, double _ymin, double _ymax) {
		primaryDrawingPanel = dp;
		if (primaryDrawingPanel != null) {
			primaryDrawingPanel.setPixelScale();
		}
		setMinMax(Math.min(_xmin, _xmax), Math.max(_xmin, _xmax), Math.min(_ymin, _ymax), Math.max(_ymin, _ymax));
		setImage(new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB)); // make a 1x1 image to start
		backgroundColor = new Color(image.getRGB(0, 0));
	}

  /**
   *  Appends an (x,y) datum to the image.
   *
   * @param  x
   * @param  y
   * @param  dataIndex  Description of Parameter
   */
  public void append(int dataIndex, double x, double y) {
    checkIndex(dataIndex).append(x, y);