I need to:

1- grab an image from part of the window

2- shrink that image by 50% (just as can be done in Microsoft Paint by using resize)

3- put that image back somewhere in the window

 

I can do "1-" using

PImage savepic = get(x0,y0,dx,dy);

 

How about 2-?

Is there some ready-made function to reduce an image?

I tried the createReader() reference example, with no file positions.txt

I thought the try/catch would work, but I get a runtime error: Null Pointer Exception

Can this be fixed?

Maybe the error should be catched earlier at the

reader = createReader("positions.txt");

instruction instead? But how to do that?

 

positions.txt does not exist or could not be read
processing.app.debug.RunnerException: NullPointerException
 at processing.app.Sketch.placeException(Sketch.java:1543)
 at processing.app.debug.Runner.findException(Runner.java:582)
 at processing.app.debug.Runner.reportException(Runner.java:558)
 at processing.app.debug.Runner.exception(Runner.java:498)
 at processing.app.debug.EventThread.exceptionEvent(EventThread.java:367)
 at processing.app.debug.EventThread.handleEvent(EventThread.java:255)
 at processing.app.debug.EventThread.run(EventThread.java:89)
Exception in thread "Animation Thread" java.lang.NullPointerException
 at sketch_mar10c.draw(sketch_mar10c.java:30)
 at processing.core.PApplet.handleDraw(Unknown Source)
 at processing.core.PApplet.run(Unknown Source)
 at java.lang.Thread.run(Thread.java:619)

 

I copied a Java public class Sort1 and am trying to put it in a Processing program.

I'm not sure what to do with the main() method.

 

Here is what I have for now, but it's not working. Even Auto Format is not working.

 

What does console.lines=24 do in the preferences.txt file?

Cause I'm still trying to increase the height of the console area, but I can get no more than 18 lines to fit.

Of course it can scroll but when I debug I like to see more of it at once.

How could  I reduce the height of the text editor section?

A simple question about using BLEND in blendColor()

 

I tried to highlight (slightly brighten) a color by doing this:

 color  cLow = col;
 color  cHigh = blendColor(col, color(255), BLEND);

and I get:

  cLow = 100, 150, 200

 cHigh =  254, 254, 254

which is too much of a highlight.

 

The reference says: BLEND - linear interpolation of colours: C = A*factor + B

Where do I put in the factor?

Should I do something like cHigh = blendColor(0.8*col, 0.2*color(255), BLEND); ?

Tried that but doesn't work.

 

Is there anything I can do for this problem?

 

I already have

run.options.memory.initial=512
run.options.memory.maximum=1536

in the preference file.

 

Exception in thread "output reader" java.lang.OutOfMemoryError: Java heap space
 at java.lang.String.toCharArray(String.java:2725)
 at processing.app.BufferedStyledDocument.appendString(EditorConsole.java:418)
 at processing.app.EditorConsole.appendText(EditorConsole.java:269)
 at processing.app.EditorConsole.message(EditorConsole.java:251)
 at processing.app.EditorConsole.write(EditorConsole.java:227)
 at

My timer is not working, is delay() the problem? or setup()?

If I put the timer code paragraph in draw() instead of setup() it works.

 

I'm merging some Java program with my own.

 

I have these lines:

    raf = new RandomAccessFile(ff, "rw");

    // Append to the end
    raf.seek(raf.length());
    raf.writeChars("abc");//writes 2-bytes Unicode char
    raf.write("ABC".getBytes());//writes 1-byte char

Now how can I write to a new line, using the equivalent of println()?

I tried raf.writeln(), raf.writeLine(), raf.writeChars("/n") and raf.writeChar("/n") but doesn't work.

I had strange arrow shaped where I was expecting rectangles. (why this always happening to me?...)

 

I managed to track down the precise cause.

Tiny rectangles (just a few pixels) are distorted, which is fine (and can't be helped) since we can barely see them.

But a large strokeWeight() magnify their outline, making visible their distorted nature.

It's kind of a bug, but an inevitable one I guess.

 

Try this:

 

I noticed that right and left 45-degree diagonals drawn with line() have different widths.

To me these should be symmetrics but they don't appear so.

In some case the right diagonal is wider, in other case it is the left one, probably depending of the color.

I'm not sure if this is a Processing bug, or a display specific problem.

 

Try this program and tell me what you see.

 

background() sets the background color.

Is there a function to get (read)  the background color?

Is it possible to set some preference so that the text area can be bigger?

As it is, it opens to about half size.

It is usually enough, but when debugging more would be better.

 

Added: I am adding an image cause what I mean is not clear.

I want to make the black text area higher.

The default.window.width and default.window.height are for the whole window.

  no= {0,3,4,6,1,2,5,7};

 

How come such an assignment can not be done (except in an initial declaration)?

It is very inconvenient to have to spell it one by one, specially for many longer arrays.

This is a very natural statement, and could easily be allowed. 

 

It's not really a problem, but maybe someone has a better way.

 

I have a class taking in an array.

To be versatile, I want the array to possibly be int[] or long[] or float[].

So I made it with 3 similar constructors, with input of type int[] or long[] or float[].

Now I can not assign this incoming array to a single variable a, since it could be of 3 types.

So I assign it to a_int or a_long or a_float.

Fine.

But then each and every other method to deal with this array has to be tripled, with a dispatching method to call the right one. So I start to feel it would be simpler to just have 3 different methods from the start.

Any comment?

I copied this program in the Processing editor.

When I just do Tools: Auto Format on it, I get an error:

 

Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap space

Can you tell me what's wrong?

 

How can I save just the corner of the display window?

Cause I want to save my images from (0,0) to (599,599), but not the menus and controls which are besides it.

I can crop it afterward in an editor, but I'm sure there is a better way.

I just notice that rect() rectangles are 1 pixel wider if stroke() is on.

 

So 2x5 becomes 3x6 for example

 

aaaaa

aaaaa

 

bbbbbb

baaaab

bbbbbb

 

It's kind of a bug, although it's easy to compensate for it.

 

 

Try the following code to see it. 

Is there a simple way to have a function_IN inside a function_OUT?

(with function_IN having access to all function_OUT variables)

Some other languages allow it, but it doesn't seem to work here.

Of course I could put the function_IN outside instead, but then I would have to pass it the full exhaustive list of variables it may need.

Here is a trivial example of what I want, but it's not working.

 

I have a print() method within a class.

Such a name is convenient, but I get the error:

The method print() in the type ranging is not applicable for the arguments (String).

This is because it is trying to use ranging.print() within ranging.print() instead of the usual print().

Is there a way to do this, without renaming my print method?

 

class ranging {
int a,b;

...

  void print() {
    print("a="+a+", b="+b); <<==== ERROR

  }//print()

 

}//class ranging

What is wrong with this simple program?

It used to work 3 years ago.

Is there a problem with the point(x,y) function?

 

I am modyfing an old program I found.

 

...

  PImage offs; // Offscreen image
  PGraphics grf; // Offscreen graph port

...

    // Off screen bitmap image
    offs = createImage(width, height, RGB);   //<<<<----ERROR
    grf  = offs.loadPixels();

...

 

But I get this error:

The method createImage(int,int) in the type Component is not applicable for the arguments (int,int,int)

 

Do you know the problem? Is it in these instructions or somewhere else? Thanks

How come the "Copy code" in the Forum posts always gives blank lines between each 2 lines?

 

line1

line2

line3

 

becomes

 

line1

 

line2

 

line3 

 

It's a bit annoying for a long code, specially my monitor has height=768, much less if you substract the banners and the menu bars and the taskbar and the scrollbar and...

It's about the Mesh Processing Library.

I have a problem finding the closest neighbors of a point.

The function getLinked( int index ) takes an index and returns those indexes which are linked to it in the Delaunay diagram. From there I can easily find which of those neighbors is the closest.

 

The problem I have is that sometimes the point itself is listed among it's neighbors.

In that case, a point linked to 2 others will have getLinked() return an array of length 3, which gives a minimum distance of 0, since the point itself is among it's neighbors.

 

Has anyone else noticed that? Seems to be a bug.

I tried to run the code from < Library PDF Export Multiple Frames >

http://processing.org/learning/library/multipleframes.html

What it does is: "Saves one PDF document of many frames drawn to the screen. Starts the file when the mouse is pressed and end the file when the mouse is released."

When I run it, it save the final image (when the mouse is released) as a 1-page pdf containing one image.

 

So what is meant by multipleframes?

 

 

How come this program doesn't work? It i so simple.

 

There is a loop, waiting for a keyPress on each iteration.

The program outputs "0", then just stops there

 

boolean wait;

void setup() {
  size (200,200);
  background (128);
  loop();
  for (int i = 0; i < 5; i++) {
    print(i);
    wait=true;
    while (wait) {
    }
  }
}

void draw() {
}

void keyPressed() {
  print("K");
  wait=false;
}