Ignotus

There weren't many mxj examples of how to draw into a BufferedImage,

so I decided to supply one. Hope it's useful--I'm sure what MaxMSP

most needs are business charts, so it can compete with Excel.

public class buf2jmTest extends MaxObject

private static final String[] INLET_ASSIST = new String[]{

"Bang or list of numbers", "List of numbers"

private static final String[] OUTLET_ASSIST = new String[]{

String useMessage = "Enter a list of positive numbers in inlet 1 or

declareInlets(new int[]{DataTypes.ALL, DataTypes.ALL});

declareOutlets(new int[]{DataTypes.ALL});

declareAttribute("pieValues", "pieValues", "setPieValues");

post("You must supply a list of positive numbers first, or set

Atom[] outputList = Atom.newAtom(pieValues());

outlet( infoOutletNum, "list", outputList );

float[] valueList = new float[list.length];

for ( int i = 0; i < list.length; i++ ) {

if ( !atom.isInt() && !atom.isFloat() ) {

private void setPieValues(float[] newPieValues) {

public static BufferedImage makeBufferedImage(Image image) {

BufferedImage bufferedImage = new BufferedImage(

image.getWidth(null), image.getHeight(null),

Graphics2D g2 = bufferedImage.createGraphics();

public static float sum( float[] values ) {

for ( int i = 0; i < values.length; i++ ) {

Color bgColor = new Color(255, 248, 228); // fff8e4

// addNotify () is required to create an image (this will call

// addNotify "creates the frame's peer, its actual resource in

whatever native window toolkit you're working on"

// cf. p. 188 Java 2D Graphics, Jonathon Knudsen, O'Reilly Pub.

Image pieImage = frame.createImage(imageWidth, imageHeight);

// use a Graphics2D to get better imaging

Graphics2D gc = (Graphics2D)pieImage.getGraphics ();

gc.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

Shape bgRect = new Rectangle2D.Double(0, 0, imageWidth, imageHeight);

gc.setStroke(new BasicStroke(2)); // 2 pixel wide stroke

// Draw whole pie in background color with a gray drop shadow

Stroke stroke_1px = new BasicStroke(1); // 1 pixel wide stroke

Shape pie = new Ellipse2D.Double(10, 8, imageHeight - inset,

Shape pieShadow = new Ellipse2D.Double(16, 11, imageHeight -

// the drawing code is probably very low impact, but it's still a

// good idea to wrap it in a Thread to free up processor time.

JitterMatrix jim = new JitterMatrix(bim);

----- |(*,+,#,=)(#,=,*,+)(=,#,+,*)(+,*,=,#)| -----

There weren't many mxj examples of how to draw into a BufferedImage,
so I decided to supply one. Hope it's useful--I'm sure what MaxMSP
most needs are business charts, so it can compete with Excel.

import com.cycling74.max.*;
import com.cycling74.jitter.*;
import java.awt.*;
import javax.swing.*;
import java.awt.geom.*;
import java.awt.image.BufferedImage;

/**
 * Creates a pie graph in a BufferedImage and then pops it into a
 * JittterMatrix for output.
 * List of numbers in left inlet sets pieValues
attribute, draws graph
 * and triggers output at left outlet.
 * List of numbers in right inlet sets pieValues attribute.
 * Bang in left inlet triggers output if pieValues attribute
 * contains numeric values.
 * Bang in right inlet outputs pieValues at info outlet.
 */
public class buf2jmTest extends MaxObject
{

  private static final String[] INLET_ASSIST = new String[]{
    "Bang or list of numbers", "List of numbers"
  };
  private static final String[] OUTLET_ASSIST = new String[]{
    "Jitter Matrix"
  };

  String useMessage = "Enter a list of positive numbers in inlet 1 or
2, or set the pieValues attribute.";
  public float[] pieValues = new float[0];

  public buf2jmTest(Atom[] args) {
    declareInlets(new int[]{DataTypes.ALL, DataTypes.ALL});
    declareOutlets(new int[]{DataTypes.ALL});
    setInletAssist(INLET_ASSIST);
    setOutletAssist(OUTLET_ASSIST);
    declareAttribute("pieValues", "pieValues", "setPieValues");
  }

  public void bang() {
    int inletNum = getInlet();
    if ( 0 == inletNum ) {
      if (0 == pieValues.length) {
        post("You must supply a list of positive numbers first, or set
the pieValues attribute.");
      } else {
        outputPieChart();
      }
    } else {
      Atom[] outputList = Atom.newAtom(pieValues());
      int infoOutletNum = getInfoIdx();
      outlet( infoOutletNum, "list", outputList );
    }
  }

  public void list(Atom[] list) {
    int inletNum = getInlet();
    boolean goodInput = true;
    // check for the right sort of list
    if ( list.length < 1 ) {
      post(useMessage);
      return;
    }
    Atom atom;
    float[] valueList = new float[list.length];
    for ( int i = 0; i < list.length; i++ ) {
      atom = list[i];
      if ( !atom.isInt()  && !atom.isFloat() ) {
        goodInput = false;
        break;
      }
      valueList[i] = atom.getFloat();
      if ( valueList[i] < 0 ) {
        goodInput = false;
        break;
      }
    }
    if ( goodInput ) {
      setPieValues(valueList);
      if ( 0 == inletNum ) {
        outputPieChart();
      }
    } else {
      post(useMessage);
    }
  }

  private float[] pieValues() {
    return pieValues;
  }
  private void setPieValues(float[] newPieValues) {
    pieValues = newPieValues;
  }

  public static BufferedImage makeBufferedImage(Image image) {
    BufferedImage bufferedImage = new BufferedImage(
      image.getWidth(null), image.getHeight(null),
      BufferedImage.TYPE_INT_RGB);
    Graphics2D g2 = bufferedImage.createGraphics();
    g2.drawImage(image, null, null);
    return bufferedImage;
  }

  public static float sum( float[] values ) {
    float sum = 0.0f;
    for ( int i = 0; i < values.length; i++ ) {
      sum += values[i];
    }
    return sum;
  }

  public BufferedImage bakePieGraph() {
        int imageWidth = 212;
        int imageHeight = 200;
        Color bgColor = new Color(255, 248, 228);  // fff8e4
        Color  colors [] = {Color.blue,
            Color.green,
            Color.red,
            Color.cyan,
            Color.magenta,
            Color.gray,
            Color.yellow,
            Color.pink,
            Color.orange,
            Color.white,
            new Color(89, 55, 233)};
        Color penColor = Color.black;
        Frame frame = new Frame ();
        // addNotify () is required to create an image (this will call
Toolkit.getDefaultToolkit ())
        // addNotify "creates the frame's peer, its actual resource in
whatever native window toolkit you're working on"
        // cf. p. 188 Java 2D Graphics, Jonathon Knudsen, O'Reilly Pub.
        frame.addNotify ();
        Image pieImage = frame.createImage(imageWidth, imageHeight);
        // use a Graphics2D to get better imaging
        Graphics2D gc = (Graphics2D)pieImage.getGraphics ();
        gc.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
        // fill and outline the background
        Shape bgRect = new Rectangle2D.Double(0, 0, imageWidth, imageHeight);
        gc.setPaint(bgColor);
        gc.fill(bgRect);
        gc.setPaint(new Color(128, 128, 128));
        gc.setStroke(new BasicStroke(2));          // 2 pixel wide stroke
        gc.draw(bgRect);
        // Draw whole pie in background color with a gray drop shadow
        Stroke stroke_1px = new BasicStroke(1);     // 1 pixel wide stroke
        gc.setStroke(stroke_1px);
        int inset = 16;
        Shape pie = new Ellipse2D.Double(10, 8, imageHeight - inset,
imageHeight - inset);
        Shape pieShadow = new Ellipse2D.Double(16, 11, imageHeight -
inset, imageHeight - inset);
        gc.setPaint(new Color(192, 192, 192));
        gc.fill(pieShadow);
        gc.draw(pieShadow);
        gc.setPaint(bgColor);
        gc.fill(pie);
        gc.setPaint(penColor);
        gc.draw(pie);
        // Compute the sum of all values
        float sum = sum( pieValues() );
        // define an arc shape for slices
        Rectangle2D pieBounds = pie.getBounds2D();
        Arc2D pieArc = new Arc2D.Double(pieBounds, 0, 15, Arc2D.PIE);
        // step pie values and draw pie slices
        // note that graphics state is set to 1 pixel stroke
        for (int accum = 0, i = 0; i < pieValues.length; i++) {
            float answerValue = pieValues[i];
            float startAngle = accum  * 360.0f / sum;
            float angle = answerValue * 360.0f / sum;
            // Fill the pie slice for current range
            pieArc.setArc(pieBounds, startAngle, angle, Arc2D.PIE);
            gc.setPaint (colors [i % colors.length]);
            gc.fill(pieArc);
            gc.setPaint(penColor);
            gc.draw(pieArc);
            accum += answerValue;
        }
    return makeBufferedImage(pieImage);
  }

    public void outputPieChart() {
      // the drawing code is probably very low impact, but it's still a
      // good idea to wrap it in a Thread to free up processor time.
    (new Thread() {
      public void run() {
        BufferedImage bim = bakePieGraph();
        JitterMatrix jim = new JitterMatrix(bim);
        outlet(0, "jit_matrix", jim.getName());
      }
    }).start();
    }

-- 
-----   |(*,+,#,=)(#,=,*,+)(=,#,+,*)(+,*,=,#)|   -----


drawing-into-a-bufferedimage

First time i've copied and pasted anything more complicated than Hello World and it's worked first time! :-) (after a bit of live wrapping)

Thanks! You're right - there aren't many examples of this!

Wow!
First time i've copied and pasted anything more complicated than Hello World and it's worked first time! :-) (after a bit of live wrapping)

Thanks for posting the code for making pie charts. I know it was many years ago and things might have changed. I tried to use it on the latest version of MAX/MSP/Jitter 5.14 running on a mac and got the following errors after I copied and pasted the code in a new patcher:

Would you have any suggestions on how I should proceed to make this work?

Could not load class 'buf2jmTest'
Could not load class 'buf2jmTest'
import: no such object
import: no such object
import: no such object
import: no such object
import: no such object
import: no such object
//: no such object
June: no such object
...etc.

Would you have any suggestions on how I should proceed to make this work? 

Val
http://www.musicalskates.com/mediawiki


You will need to compile the class. Are you using OSX or windows?

in the case you are on 10.6.4 here's a compiled version.

Thank you, I am using OSX 10.6.4 and it worked fine. Much appreciated.

Drawing into a BufferedImage