Processing Forum

Background and foreground images

[2 Replies]
- 24-Jun-2013 08:40 AM
- Forum: General Discussion
Hi everyone!

I wanna develop a program that allows the user to create simple animations drawing each single frame.
To do this, I'd like to show the user the previous frame on the background, so he/she can see it while drawing the new one(in order to draw new one in the correct position -think, for example, to a running man-).

So I have 2 PImage objects, prev and cur. The problem shows up when I want to save to current frame: since I'm showing them both, and drawing on the window using common methods such as line, ellipse and so on, I'm not able to save just the cur frame.

So my question is: is there any way to edit a PImage itself? I would solve the problem if I there would be, for instance, a method "line" that modifies the cur.pixels array without touching the pixels array of the window.

Any help is appreciated,

Marco Galassi

Embedding jar Applet into an HTML page

[2 Replies]
- 24-Jan-2012 10:22 AM
- Forum: Integration and Hardware
Hi all,
i've done some search but I have not found anything, so, i'm asking for your help.

I have created an applet using Eclipse. Once finished it i've exported it with the File->Export->Java-> JAR File tool(not Runnable Jar File).

I need to embed this jar inside an HTML page and i have been told to use this code here:
1. <object classid="java:bMapped.class" width="xxx" height="yyy" archive="arc.jar">
2. <param name="param" value="val" />
3. </object>
but it does not seem to work.
I think that the problem could be caused by the structure of my JAR file.

I think the code posted above supposes that the file class is just inside the archive arc.jar, but in my case it is not.

In my JAR .class files are inside folders called core and geo. So, I have:

arc.jar

|->core->bMapped.class

|->geo->other .class files

How should I edit the <object> tag to get my applet work?

Thank you all,

MG

Arguments to an applet

[6 Replies]
- 23-Jan-2012 08:28 AM
- Forum: Integration and Hardware
Hello!

I'm developing an applet using Processing that will display certain data on a map. Since, for now, this data is stored an a CSV(Comma-Separated Values) file, i'd like to know if there is the possibility to pass this file as an argument to the applet when it will be ran on the website.

Thank you all,

MG

GLException while closing the applet

[0 Replies]
- 29-Nov-2011 05:42 AM
- Forum: Contributed Library Questions
Hi everybody,

here's the problem: i wrote an applet which works with maps and draws things on them. It seems to work quite fine, but when I close the applet(using the eclipse applet viewer) I get this exception:
1. Exception in thread "Animation Thread" javax.media.opengl.GLException: Unable to lock surface
2. at com.sun.opengl.impl.x11.X11OnscreenGLDrawable.lockSurface(X11OnscreenGLDrawable.java:133)
3. at com.sun.opengl.impl.x11.X11OnscreenGLContext.makeCurrentImpl(X11OnscreenGLContext.java:61)
4. at com.sun.opengl.impl.GLContextImpl.makeCurrent(GLContextImpl.java:134)
5. at processing.opengl.PGraphicsOpenGL.detainContext(Unknown Source)
6. at codeanticode.glgraphics.GLGraphics.dispose(Unknown Source)
7. at processing.core.PApplet.dispose(Unknown Source)
8. at processing.core.PApplet.run(Unknown Source)
9. at java.lang.Thread.run(Thread.java:662)
I can't understand what it is and wasn't able to find anything with google..

What does "Unable to lock surface" mean?

Does anyone know something about it?

Thank you guys.

Marco Galassi

Problem when running applet with Eclipse

[5 Replies]
- 22-Oct-2011 03:21 AM
- Forum: Integration and Hardware
Hi everyone!
Hope this is the right place to post in.
I'm trying to create a processing sketch in Eclipse. I've followes the instructions on Processing.org and now i'm able to create simple sketches with Eclipse, but I have some problem with this one.

I've already tried with the Processing IDE and it works fine, but it does not work with Eclipse and I don't know why. The app will be executed on a website, so I want to run it as a Java Applet.

Here's the code:
2. import processing.core.*;
3. import processing.opengl.*;
4. import codeanticode.glgraphics.*;
5. import de.fhpotsdam.unfolding.*;
6. import de.fhpotsdam.unfolding.providers.*;
7. import de.fhpotsdam.unfolding.utils.*;
9. public class bMapped extends PApplet {
11. Map mappa;
13. public void setup(){
14. size(600, 500, GLConstants.GLGRAPHICS);
15. smooth();
16. mappa = new Map(this, new Google.GoogleMapProvider());
17. MapUtils.createDefaultEventDispatcher(this, mappa);
18. }
20. public void draw(){
21. mappa.draw();
22. }
24. }
It should simply visualize a Map that you can zoom in/out and move by keeping pressed mouse button.

It gives me this exeptions when I try to run it as a Java Applet.
2. GLGraphics version: 1.0.0
3. GL_ARB_geometry_shader4 extension not available
4. GL_ARB_texture_float extension not available
5. Exception in thread "Animation Thread" java.lang.NoClassDefFoundError: org/apache/log4j/Logger
6. at de.fhpotsdam.unfolding.Map.<clinit>(Unknown Source)
7. at bMapped.setup(bMapped.java:15)
8. at processing.core.PApplet.handleDraw(Unknown Source)
9. at processing.core.PApplet.run(Unknown Source)
10. at java.lang.Thread.run(Thread.java:662)
11. Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Logger
12. at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
13. at java.security.AccessController.doPrivileged(Native Method)
14. at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
15. at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
16. at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
17. at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
18. ... 5 more
I have an idea that the problem could be caused by security restrictions applied to Java Applet but i'm not sure.

Any help will be appreciate.

Thanks and greetings from Italy(excuse me for my bad english)

Marco

Processing and maps(e.g. Google Maps)

[3 Replies]
- 12-Oct-2011 07:25 AM
- Forum: General Discussion
Hi everyone, I hope I have choosen the right forum to post in!

I have to write an application based with Processing based on maps(e.g. Google Maps), but I do not know anything about how to interact with them. I will have to draw shapes on the map in certain places based on a function.

Is there a way to communicate with google maps? Where should I start from?

Any help will be appreciate. Sorry for my bad english.

Thanks,

Marco

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