Java Image to PImage

Programming Questions

akiersky

in Programming Questions • 2 years ago

Hi All,

I am trying to convert a Java Image (actually a piece of html text contained in a JDialog) into a PImage.

is this possible? thoughts/ideas?

thanks,

Replies(10)

PhiLho

Re: Java Image to PImage

2 years ago

It is possible. The PImage constructor can get a Java image.

akiersky

Re: Java Image to PImage

2 years ago

Hmm, well it seems like everything is working correctly, it compiles at least. But the PImage I end up with does not seem to contain anything.

maybe im missing something? My process is this:

- Create JDialog with some HTML text in it,

- Create a new Java Image and call .createImage() on the JDialog,

- Create a PImage and pass the Image to that,

- then draw the image to stage with image(),

- then hide the original JDialog to only see the PImage.

but nothing shows up. Here's the code:

buffer.beginDraw();
ta = new HTMLTextArea(frame, 100,100,200,400);
ta.setText(style+title+story);
ta.setVisible(true);
Image jImg = ta.createImage(ta.w, ta.h);
println("Jimage :: "+jImg);
PImage img = new PImage(jImg);
println("Pimage :: "+img);
image(img, 0, 0);
buffer.endDraw();

Thoughts? Need more code to tell?

Thanks!

quarks

Re: Java Image to PImage

2 years ago

You state call .createImage() on the JDialog but

there is no JDialog object in your code
javax.swing,JDialog has no method called createImage
the createImage is called on an HTMLTextArea object
HTMLTextArea is not part of the Java class libraries (so where does it come from?)

I think you need to provide more inormation and/or code if anyone is going to be able to help.

akiersky

Re: Java Image to PImage

2 years ago

Hi Quarks,

sorry for the incomplete snippit, HTMLTextArea extends JDialog, which inherits createImage from the Component class.

I actually got some of it working by repainting the HTMLTextArea, and calling getGraphics on the Java Image to convert it to a Graphics object, which I can tell to update, which seems to help the jImg pass the Image to the PImage (pheew

) here's the updated chain from above:

buffer = createGraphics(300, 500, P2D);//_buffer;
buffer.beginDraw();
ta = new HTMLTextArea(frame, 100,100,200,400);
ta.setText(style+title+story);
ta.setVisible(true);
ta.repaint();
Image jImg = ta.createImage(ta.w, ta.h);
println("Jimage :: "+jImg);
Graphics g = jImg.getGraphics();
ta.update(g);
PImage img = new PImage(jImg);
println("Pimage :: "+img);
image(img, 0, 0);
buffer.endDraw();
ta.setVisible(false);

And the HTMLTextArea (which is very useful for outputting the html text) :

import javax.swing.*;
import java.awt.*;
import java.awt.image.*;
class HTMLTextArea extends JDialog {
int x, y, w, h;
String htmlstring = "";
JEditorPane panel;
Frame f;
/** Creates new form GUI */
public HTMLTextArea(Frame f, int x, int y, int w, int h) {
super(f, java.awt.Dialog.ModalityType.MODELESS);
this.f = f;
Point p = f.getLocation();
Point winloc = new Point(0,0);
this.x = p.x + x + winloc.x;
this.y = p.y + y + winloc.y;
this.w = w;
this.h = h;
initComponents();
}
void setText(String textstring) {
try {
InputStream is = new ByteArrayInputStream(textstring.getBytes("UTF-8"));
panel.read(is, "html");
}
catch (Exception e) {
}
}
void initComponents() {
panel = new JEditorPane();
try {
panel.setContentType("text/html");
Insets iSet = new Insets(5, 5, 5, 5);
panel.setMargin(iSet);
panel.setEditable(false);
panel.setOpaque(false);
}
catch (Exception e) {}
add(panel);
setSize( w, h);
setResizable(false);
setLocationRelativeTo(f);
setLocation(x, y);
setBackground(new Color(0,0,0,0));
setUndecorated(true);
JRootPane root = getRootPane();
}
void repaint(int newX, int newY) {
x = newX;
y = newY;
setLocation(x, y);
panel.repaint();
}
}

Now all that is not passing is the Alpha of the HTMLTextArea (does it have one??) to the PImage. Im not sure where it is getting lost. I know it has it initially , but in the end I end up with a black box behind the 'imagafied' text area. Any thoughts on where this may be happening?

Thanks!

quarks

Re: Java Image to PImage

2 years ago

I have just checked the Java documentation for the Component class and createGrphaics command creates an off-screen drawable image to be used for double bufferin which probably explains why you have to repaint the component to force it to be used..

The HTMLTextArea does not have an alpha channel since it inherits from JDialog (which like all Java GUI compomens are opaque).

PhiLho

Re: Java Image to PImage

2 years ago

Not sure why you call buffer.[begin|end]Draw(); as you don't use it in between...

quarks

Re: Java Image to PImage

2 years ago

Modified my post above because i just spotted phi.lho (well - spotted - I missed that completely) comment.

@phi.lho well spotted I missed that completely

So the code below does the job but no ALPHA possible.

import java.awt.*;
HTMLTextArea ta;
PImage img;
void setup()
{
size(600,600);
background(255,255,200);
ta = new HTMLTextArea(frame, 100,100,400,400);
ta.setText("Peter Lager");
ta.setVisible(true);
ta.repaint();
Image jImg = ta.createImage(ta.w, ta.h);
println("Jimage :: "+jImg);
Graphics g = jImg.getGraphics();
ta.update(g);
PImage img = new PImage(jImg);
println("Pimage :: "+img);
image(img, 0, 0);
ta.setVisible(false);
}

akiersky

Re: Java Image to PImage

2 years ago

@phi.lho: I was thinking I needed that to create a processing offscreen buffer but I realize now, that the PImage is doing pretty much the same thing.

@quarks: in the HTMLTextArea I call panel.setOpaque(false); to set the JEditorPane transparent, but I guess it doesn't make the JDialog transparent :/

is there a way to get the end resulting PImage to get the transparent? or maybe set the background of the JDialog to a 255 green that i could 'key' out after the fact?

Thanks for the tips guys!

akiersky

Re: Java Image to PImage

2 years ago

by the way quarks, when you run the app, try moving the window. The HTMLTextArea/JEditorPane stays put, even when the window is not behind it at all. or if you click the text, you can move just the text around your screen. very strange.

akiersky

Re: Java Image to PImage

2 years ago

Ok, it looks like I can also call createImage on the JPannel object inside the HTMLTextArea; ta.panel.createImage(ta.w, ta.h); , which is not opaque according to panel.setOpaque(false); however there is still no alpha on the resulting PImage. Im not sure where it is getting lost, maybe on the Java Image, maybe on the Graphics, maybe it isn't making it out of the JPannel... hmm

thoughts?

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