Embedding processing without threading?

ci_kic

Embedding processing without threading?

in Integration and Hardware • 1 year ago

Hello

I would like to embed processing into a java application. I want to use processing core api to draw charts and therefore the threading and framing is not necessary. I would like to do something like this:

PApplet pa = new PApplet();

pa.size(200,100);

pa.background(0,0,0);

pa.stroke(255, 255, 255);

pa.line(0, 0, 200, 100);

pa.line(200, 100, 0, 0);

pa.handleDraw();

pa.saveAsJpg();

pa.dispose();

How do I have to adapt the PApplet code to fit my needs? I have tried simply deactivating the main while loop but I am just getting an empty sketch without any lines.

Thanks

Chris

Replies(3)

hellochar

Re: Embedding processing without threading?

1 year ago

I haven't tried this myself, but I'm guessing that things will be easier if you subclass PApplet, put all your drawing methods in setup(), and then call init() on it, like this:

class MyPApplet extends PApplet {
public void setup() {
size(200, 200);
noLoop(); //turn off the thread constantly calling draw()
//...do drawing...
}
}
...
MyPApplet mine = new MyPApplet();
mine.init(); //this automatically calls setup() at the end
mine.saveAsJpg();

I don't know if you need to do mine.dispose()

Let me know if it works, or whatever else you do to solve the problem.

ci_kic

Re: Embedding processing without threading?

1 year ago

Thanks! Sadly this solution still ends up in an applet showing on the screen and a thread waiting until you terminate the applet by clicking X. After that the object is destroyed and the image got not saved.

The Goal is to save a jpg image without any gui action (this is running on a gui less server anyway). Any other ideas?

Check out this code:

package processing.core;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.util.logging.Logger;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class PlotterApplet extends PApplet{
public static void main(String args) {
PlotterApplet pa = new PlotterApplet();
pa.init();
pa.save("D:\\tmp\\test.jpg");
}
public PlotterApplet () {
}
public void setup(){
size(200, 100);
noLoop(); //turn off the thread constantly calling draw()
background(0,0,0);
stroke(255, 255, 255);
line(0, 0, 200, 100);
line(0, 100, 200, 0);
}
@SuppressWarnings("restriction")
public byte[] getBufferedImage() {
loadPixels();
ByteArrayOutputStream out = new ByteArrayOutputStream();
BufferedImage img = new BufferedImage(width, height, 2);
img = (BufferedImage) this.createImage(width, height, RGB).getImage();
for (int i = 0; i < width; i++)
for (int j = 0; j < height; j++)
img.setRGB(i, j, pixels[j * width + i]);
try {
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam encpar = encoder.getDefaultJPEGEncodeParam(img);
encpar.setQuality(0.9f, false);
encoder.setJPEGEncodeParam(encpar);
encoder.encode(img);
} catch (Exception e) {
Logger.getAnonymousLogger().warning(e.getMessage());
}
return out.toByteArray();
}
public void saveAsJpg(String fileName) {
this.saveBytes(fileName, getBufferedImage());
}
}

ci_kic

Re: Embedding processing without threading?

1 year ago

There was a typo in the main -> String instead of String[]. Eclipse simply runned the class as applet, this is why an applet screen was shown. Never the less, it still doesn't work.

Thaks Chris

PS This is how I could solve my Issue:

package processing.core;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.util.logging.Logger;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
@SuppressWarnings("restriction")
public class Plotter extends PApplet{
private static final long serialVersionUID = 2530860584900632897L;
public static void main(String[] args) {
Plotter pa = new Plotter();
pa.init(false); //added one parameter to controll the method call for start()
pa.size(200,100); //vergin
pa.handleDraw(); //vergin
// prepare drawings
pa.recorder = pa.createGraphics(200, 100, JAVA2D); // Hacked: sub call makeGraphics(): hard code JAVA2D due to classloader issues
pa.beginRecord(pa.recorder);
// draw
pa.background(0,0,0);
pa.stroke(255, 255, 255);
pa.line(0, 0, 200, 100);
pa.line(0, 100, 200, 0);
pa.stroke(255, 90, 90);
pa.line(100, 0, 100, 100);
//finish
pa.handleDraw();
pa.saveAsJpg("D:\\tmp\\test_extended.jpg"); //Hacked: Procedures added "getBufferedImage()" and "saveAsJpg()"
pa.dispose(); //just do be on the safe side
}
public Plotter () {
}
public void init(boolean autostart) {
// copy of original source code
// println("init() called " + Integer.toHexString(hashCode()));
// using a local version here since the class variable is deprecated
Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
screenWidth = screen.width;
screenHeight = screen.height;
// send tab keys through to the PApplet
setFocusTraversalKeysEnabled(false);
// millisOffset = System.currentTimeMillis(); // moved to the variable
// declaration
finished = false; // just for clarity
// this will be cleared by draw() if it is not overridden
looping = true;
redraw = true; // draw this guy once
firstMouse = true;
// these need to be inited before setup
sizeMethods = new RegisteredMethods();
preMethods = new RegisteredMethods();
drawMethods = new RegisteredMethods();
postMethods = new RegisteredMethods();
mouseEventMethods = new RegisteredMethods();
keyEventMethods = new RegisteredMethods();
disposeMethods = new RegisteredMethods();
try {
getAppletContext();
online = true;
} catch (NullPointerException e) {
online = false;
}
try {
if (sketchPath == null) {
sketchPath = System.getProperty("user.dir");
}
} catch (Exception e) {
} // may be a security problem
Dimension size = getSize();
if ((size.width != 0) && (size.height != 0)) {
// When this PApplet is embedded inside a Java application with
// other
// Component objects, its size() may already be set externally
// (perhaps
// by a LayoutManager). In this case, honor that size as the
// default.
// Size of the component is set, just create a renderer.
g = makeGraphics(size.width, size.height, sketchRenderer(), null,
true);
// This doesn't call setSize() or setPreferredSize() because the
// fact
// that a size was already set means that someone is already doing
// it.
} else {
// Set the default size, until the user specifies otherwise
this.defaultSize = true;
int w = sketchWidth();
int h = sketchHeight();
g = makeGraphics(w, h, sketchRenderer(), null, true);
// Fire component resize event
setSize(w, h);
setPreferredSize(new Dimension(w, h));
}
width = g.width;
height = g.height;
addListeners();
// this is automatically called in applets
// though it's here for applications anyway
// HACK: do not autstart
if (autostart)
start();
}
// Due to classloader problems I have to hard code JAVA2D
@Override
protected PGraphics makeGraphics(int iwidth, int iheight, String irenderer,
String ipath, boolean iprimary) {
PGraphics pg = (PGraphics) new PGraphicsJava2D();
pg.setParent(this);
pg.setPrimary(iprimary);
if (ipath != null)
pg.setPath(ipath);
pg.setSize(iwidth, iheight);
return pg;
}
public byte[] getBufferedImage() {
loadPixels();
ByteArrayOutputStream out = new ByteArrayOutputStream();
BufferedImage img = new BufferedImage(width, height, 2);
img = (BufferedImage) this.createImage(width, height, RGB).getImage();
for (int i = 0; i < width; i++)
for (int j = 0; j < height; j++)
img.setRGB(i, j, pixels[j * width + i]);
try {
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam encpar = encoder.getDefaultJPEGEncodeParam(img);
encpar.setQuality(0.9f, false);
encoder.setJPEGEncodeParam(encpar);
encoder.encode(img);
} catch (Exception e) {
Logger.getAnonymousLogger().warning(e.getMessage());
}
return out.toByteArray();
}
public void saveAsJpg(String fileName) {
this.saveBytes(fileName, getBufferedImage());
}
}

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