Android Open Source - AnkiStats Function Drawer

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Back to project page AnkiStats.
License

The source code is released under:
GNU General Public License
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Java Source Code

/**
 * //  www . j a  v a 2s .com
 */
package com.wildplot.android.rendering;

import com.wildplot.android.rendering.graphics.wrapper.BasicStroke;
import com.wildplot.android.rendering.graphics.wrapper.Color;
import com.wildplot.android.rendering.graphics.wrapper.Graphics;
import com.wildplot.android.rendering.graphics.wrapper.Graphics2D;
import com.wildplot.android.rendering.graphics.wrapper.Rectangle;
import com.wildplot.android.rendering.graphics.wrapper.Stroke;
import com.wildplot.android.rendering.interfaces.Drawable;
import com.wildplot.android.rendering.interfaces.Function2D;
import com.wildplot.android.rendering.interfaces.StepFunction2D;


/**
 * FunctionDrawer is used to draw a mathematical function on a given PlotSheet
 * 
 * 
 */
public class FunctionDrawer implements Drawable {
  
  private boolean isStepFunction = false;
  
  private double extraScaleFactor = 1;
  
  private boolean autoscale = false;
  
  private double scaleFactor = 10;
  private double binSize = 1;
  
  private boolean isOnFrame = false;
  
  private double yOffset = 0;
  
  private float size = 1;
  
  private double leftLimit = 0;
  private double rightLimit = 0;
  
  private boolean hasLimit = false;
  
  /**
   * true when warning for pole positions is allready given
   */
  private boolean warned = false;
  
  /**
   * the function which will be plotted with this FunctionDrawer
   */
  private Function2D function;
  
  /**
   * the PlotSheet on which this FunctionDrawer is drawing upon
   */
  private PlotSheet plotSheet;
  
  /**
   * the color of the function graph
   */
  private Color color = new Color(255,0,0);

    private boolean isOnReset = false;

    /**
   * Constructor for a FunctionDrawer object
   * @param function given function which is drawn
   * @param plotSheet the sheet the function will be drawn onto
   * @param color color of the function
   */
  public FunctionDrawer(Function2D function, PlotSheet plotSheet, Color color) {
    this.function = function;
    this.plotSheet = plotSheet;
    this.color = color;
  }
  
  /**
   * Constructor for a FunctionDrawer object
   * @param function given function which is drawn
   * @param plotSheet the sheet the function will be drawn onto
   * @param color color of the function
   */
  public FunctionDrawer(Function2D function, PlotSheet plotSheet, Color color, double leftLimit, double rightLimit) {
    this.function = function;
    this.plotSheet = plotSheet;
    this.color = color;
    this.hasLimit = true;
    this.leftLimit = leftLimit;
    this.rightLimit = rightLimit;
  }
  
  /* (non-Javadoc)
   * @see rendering.Drawable#paint(java.awt.Graphics)
   */
  @Override
  public void paint(Graphics g) {

        isOnReset = false;
    if(function instanceof StepFunction2D) {
      this.isStepFunction = true;
    }
    
     Graphics2D g2D = (Graphics2D) g;     
     Stroke oldStroke = g2D.getStroke();
        g2D.setStroke(new BasicStroke(this.size));  // set stroke width of 10
     
    Color oldColor = g.getColor();
    Rectangle field = g.getClipBounds();
    g.setColor(color);
    
    
    if(autoscale){
      double[] start = this.plotSheet.toCoordinatePoint(0, 0, field);
      double[] end = this.plotSheet.toCoordinatePoint(0, 0+this.plotSheet.getFrameThickness(), field);
      
      this.scaleFactor = Math.abs(end[1] - start[1]);
//      this.scaleFactor *= binSize;
    } else {
      this.scaleFactor = 1.0;
    }
    
    if(this.isOnFrame)
      yOffset = plotSheet.getyRange()[0];
    
    double[] drawingPoint = plotSheet.toCoordinatePoint(field.x,0,field);
    if(this.isOnFrame)
      drawingPoint = plotSheet.toCoordinatePoint(field.x+this.plotSheet.getFrameThickness(),0,field);
    
    double f_x = function.f(drawingPoint[0])*scaleFactor*extraScaleFactor;
    double f_x_old = f_x;

        float[] coordStart = plotSheet.toGraphicPoint(drawingPoint[0],f_x,field);
    if(this.isOnFrame)
      coordStart = plotSheet.toGraphicPoint(drawingPoint[0],this.yOffset-f_x,field);

        float[] coordEnd = coordStart;

        float leftStart = field.x+1;
        float rightEnd = field.width + field.x;
    if(this.isOnFrame){
      leftStart = field.x+this.plotSheet.getFrameThickness()+1;
      rightEnd = field.width + field.x-this.plotSheet.getFrameThickness();
    }
    
    if(this.hasLimit){
      leftStart = plotSheet.xToGraphic(leftLimit, field);
      rightEnd = plotSheet.xToGraphic(rightLimit, field);
    }
    
    for(int i = Math.round(leftStart); i< rightEnd; i++) {
            if(isOnReset)
                return;
      drawingPoint = plotSheet.toCoordinatePoint(i,0,field);
      
      coordEnd = coordStart;
      
      f_x_old = f_x;
      f_x = function.f(drawingPoint[0])*scaleFactor*extraScaleFactor;
      coordStart = plotSheet.toGraphicPoint(drawingPoint[0],f_x,field);
      if(this.isOnFrame)
        coordStart = plotSheet.toGraphicPoint(drawingPoint[0],this.yOffset-f_x,field);
      
      double overlap = 0.2 * (plotSheet.getyRange()[1] - plotSheet.getyRange()[0]);
      
      if(f_x_old != Double.NaN && f_x!= Double.NaN &&
          f_x_old != Double.NEGATIVE_INFINITY && f_x!= Double.NEGATIVE_INFINITY &&
          f_x_old != Double.POSITIVE_INFINITY && f_x!= Double.POSITIVE_INFINITY &&
          f_x_old <= plotSheet.getyRange()[1] + overlap && f_x_old >= plotSheet.getyRange()[0] - overlap &&
          f_x <= plotSheet.getyRange()[1] + overlap && f_x >= plotSheet.getyRange()[0] - overlap) {
        
        g.drawLine(coordStart[0], coordStart[1], coordEnd[0], coordEnd[1]);

        
      } else if(!warned) {
        System.err.println("Could not draw part of function, possible pole or out of reach");
        warned = true;
      }
      
    }
    g2D.setStroke(oldStroke);
    g.setColor(oldColor);

  }
  
  public double getMaxValue(int pixelResolution){
    Rectangle field = new Rectangle(pixelResolution, pixelResolution);
    double[] drawingPoint = plotSheet.toCoordinatePoint(field.x,0,field);
    double max = Double.NEGATIVE_INFINITY;
    
    for(int i = 0; i< pixelResolution; i++) {
      drawingPoint = plotSheet.toCoordinatePoint(i,0,field);
      double f_x = function.f(drawingPoint[0]);
      if(f_x > max)
        max=f_x;
    }
    
    return max;
  }
  
  
  /**
   * @param size the size to set
   */
  public void setSize(float size) {
    this.size = size;
  }

  public boolean isOnFrame() {
    return this.isOnFrame;
  }
  
  /**
   * unset the axis to draw on the border between outer frame and plot
   */
  public void unsetOnFrame() {
    this.isOnFrame = false;
    yOffset = 0;
  }
  
  /**
   * set the axis to draw on the border between outer frame and plot
   */
  public void setOnFrame(double extraSpace) {
    this.isOnFrame = true;
    yOffset = plotSheet.getyRange()[0]-extraSpace;
  }
  
  public void setOnFrame() {
    setOnFrame(0);
  }
  
  public void setAutoscale(double binWidth) {
    this.binSize = binWidth;
    this.autoscale = true;
  }
  public void unsetAutoscale() {
    this.autoscale = false;
  }

  public double getExtraScaleFactor() {
    return extraScaleFactor;
  }

  public void setExtraScaleFactor(double extraScaleFactor) {
    this.extraScaleFactor = extraScaleFactor;
  }

  @Override
  public void abortAndReset() {
        isOnReset = true;
    
  }

    @Override
    public boolean isClusterable() {
        return true;
    }

    @Override
    public boolean isCritical() {
        return false;
    }


}
Java Source Code List
