Processing Forum

Display something during initial loading

[3 Replies]
- 20-Sep-2013 04:13 PM
- Forum: General Discussion
I have quite a lengthy program now, so it takes about 5 seconds to start up.

Is there a way to display a loading screen, or a splash screen, something just to fill up that time to make the program look a bit better?

Thanks.

Is there a way to increase the default indent of the processing editor?

[2 Replies]
- 02-Sep-2013 05:02 PM
- Forum: Integration and Hardware
I'm using Processing 2.0.2, and it's really starting to get on my nerves that I have to double indent when I want a 4-space margin.

I've seen the option to change the default indent margin on other editors, like Notepad++, and I'd think it'd be a good feature to implement into Processing.

Just a thought.

How can I get the position of any co-ordinate of a line?

[9 Replies]
- 26-Aug-2013 09:00 AM
- Forum: General Discussion
I'm trying to make a program, that has nodes drawn on with lines connecting the nodes, but I'm having trouble with being able to select a line. The way I select nodes is by looping through each node's position when the mouse is clicked, and seeing if the mouse is on top of the node's position.

However I can't think of a way to be able to select a link. The link is drawn on during the loop() function, which is just a line() command with the two nodes' positions as parameters. So when the mouse is clicked, I'm not sure what the best way to check if each link is being clicked.

Any suggestions are welcome, thanks.

GUIBuilder for G4P has NullPointerExceptions when running

[3 Replies]
- 22-Aug-2013 03:22 PM
- Forum: Contributed Library Questions
I created a GUI using the GUIBuilder tool [ http://lagers.org.uk/g4ptool/index.html], however, when running the GUI I get warnings saying the event hadler's can't be found. And then when I click a button, or select a checkbox, a Null Pointer Exception occurs.

The output of which looks is:
1. java.lang.NullPointerException
2. at processing.mode.java.runner.Runner.findException(Runner.java:947)
3. at processing.mode.java.runner.Runner.reportException(Runner.java:892)
4. at processing.mode.java.runner.Runner.exceptionEvent(Runner.java:818)
5. at processing.mode.java.runner.Runner$2.run(Runner.java:707)
Is there anything that I've done to cause this, or is there an error in the library?

Thanks.

Default Color Scheme for G4P Controls

[0 Replies]
- 22-Aug-2013 04:04 AM
- Forum: Contributed Library Questions
I sent Quarks a message about the default color scheme for GTextFields.
So for future reference, BLUE_SCHEME is the default. This can be set using the setLocalColorScheme() function for each control, or setGlobalColorScheme() after declaring the fields to set the color scheme for all the controls. The function getLocalColorScheme() can be used to retrieve the color scheme for each control.

The other schemes can be found at http://www.lagers.org.uk/g4p/ref/interfaceg4p__controls_1_1_g_constants.html

And a brief example:
1. GTextField textF;
3. textF = new GTextField(this, 10, 10, 100, 25);
4. textF.addEventHandler(this, "handleTextChangesToTextF");
6. //Change scheme to red if the length of the text field is less than 5.
7. public void handleTextChangesToTextF(GTextField textField, GEvent event)
8. {
9. if (event == GEvent.CHANGED)
10. {
11. if (textField.getText().length() < 5)
12. {
13. //Set text field to red scheme
14. textField.setLocalColorScheme(RED_SCHEME);
15. }
16. else
17. {
18. //Return text field to the default scheme
19. textField.setLocalColorScheme(BLUE_SCHEME);
20. }
21. }
22. }

Dynamically change size of GWindow

[2 Replies]
- 16-Aug-2013 06:33 AM
- Forum: Contributed Library Questions
Hi,

I'm looking at changing the size of a GWindow while it's open, and moving the buttons on the window.

At the moment, I have a function that when ran, will make the size of the GWindow bigger, and add in a new row of GTextField's. To make the window bigger I just use the setSize() function. But there isn't a setLocation function for GButton, or anything similar that I can find.

I've tried creating a new button, and redrawing, but that doesn't remove the old buttons.

Is there any other way of moving a GButton?

Thanks.

GTextField Event Handler isn't being executed when text is changed

[7 Replies]
- 15-Aug-2013 02:57 AM
- Forum: Contributed Library Questions
Hi,

I'm having some trouble with the custom handlers. I have a 3 arrays of GTextField's and each one has a custom eventHandler.

As I initiate each Text Field, say:

sensorsList[i].addEventHandler(this, "handleSensorAtomTextEvent");

sensorsList_high[i].addEventHandler(this, "handleSensorAtomTextEvent");
sensorsList_low[i].addEventHandler(this, "handleSensorAtomTextEvent");

Then I have a function called:

handleSensorAtomTextEvent(GEditableTextControl text, GEvent event)

The only problem is that the handler isn't being run when the text is changed.

If I add in a general handleTextEvents() function, then that runs fine. But the problem is I need to know which textfield is being changed, hence why I've made custom handlers. So it's not really much use, and now I'm stuck!

Thanks for any help! :)

Run function on closing GWindow in G4P?

[8 Replies]
- 11-Aug-2013 04:10 AM
- Forum: Contributed Library Questions
Hi,

I have a cancel button on the GWindow, which when clicked runs a function. Can I change the GWindow so when I close it by clicking the red X it can run that function too?

At the moment, I have just found the setCloseAction(GWindow.CLOSE_WINDOW) stuff, but there's nothing about setting a custom function to run instead of closing the window.

Is there a way to override the windowClosing function?

Thanks.

Is there a way to get the screen co-ordinates of the window?

[5 Replies]
- 29-Jul-2013 05:24 PM
- Forum: General Discussion
I am looking to get the co-ordinates of the main window.

I want to create a new JFrame that can be created in the center of the main window, rather than where the OS decides to open it. I have already looked into it, but I can only find screenX(), but that does the inverse of what I am looking for. I just want to know the coordinate of the top-left corner of the window, ie. where 0,0 is on the window.

Thanks.

JSONObject not found

[2 Replies]
- 23-Jul-2013 04:22 AM
- Forum: Programming Questions
I'm having some trouble with JSON and Java, I have a working function to export a data strucutre into JSON and save it in a file. But when I try to do the reverse and import the data strucutre back into java, I get an error, the output of which is:
```
java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at ..... Caused by: java.lang.RuntimeException: JSONObject["nodeID"] not found. at processing.data.JSONObject.get(JSONObject.java:549) at processing.data.JSONObject.getString(JSONObject.java:568) at Graph.loadJSON(Graph.java:934) ... 21 more
```
From that error I take that the String 'nodeID' can't be found within the node, but it is in the JSON output, which looks like this:
```
{"network": [ {"node": { "nodeID": "1", "radius": 40 "atom": { "id": "a-2675-EH", "activeTime": 0, "type": "Motor", "linkFrom": [{ "atomID": "a-2312-TL", "delay": 0.20000000298023224 }], "linkTo": [{ "atomID": "a-3289-Ql", "delay": 0.20000000298023224 }] }, .....
```
The JSON code is an array of nodes contained within network, then each node object contains a String nodeID, and 3 Float variables, then an Object called atom. This atom then contains two Strings, a float, and 2 arrays called linkTo and linkFrom, which contain objects to represent a link (atomID and delay, string and float respectfully)

And the Java code to load each node from the network looks like this:
```
JSONObject network = loadJSONObject(selection.getAbsolutePath()); JSONArray nodes = network.getJSONArray("network"); for (int i=0; i<nodes.size(); i++) { //Load node JSONObject node = nodes.getJSONObject(i); String nodeID = node.getString("nodeID"); <-- Error occurs here Float x = node.getFloat("x"); Float y = node.getFloat("y"); Float radius = node.getFloat("radius"); JSONObject atom = node.getJSONObject("atom"); .....
```
I'm sure I'm just missing something simple, but I've spent nearly a week trying to tweak this and getting nowhere!

I know the node is loading properly, because a println(node) statement inside the for loop prints out the node exactly as it should, it's just trying to fetch the nodeID that seems to not work. Even if I change the order and try to fetch the x, or y float that causes the error too.

Thanks.

Drawing an arrow from the edge of a circle to another circle's edge

[6 Replies]
- 01-Jul-2013 01:45 PM
- Forum: General Discussion
I'm trying to draw an arrow from the edge of a circle to the edge of another circle.

The only data I store is the coordinates of the two circles, and using the line function to join them up, and triangle to draw the arrow head.

But I can't find a way to start the line at the edge of the circle and get it to stop at the edge of the other node, and be able to drag the circles round without the arrows going wrong.

Drawing a Network of Nodes and Links

[7 Replies]
- 23-Jun-2013 09:49 AM
- Forum: General Discussion
I'm looking to make an application using Java, that can display a network of connected nodes.

I want the ability to:
- Add a node.

- Edit properties of a node, each node will contain information such as name and id.

- Link nodes together, as in one node links to another node.

- Move nodes around the network.

I'm just not too sure of how to approach this in processing, whether to just draw circles for nodes, and draw lines for the links. But then it'd be hard to edit properties, and move the nodes within the graph. Are there any suitable libraries I could use, or a different approach that I can't see?

Thanks for any help you may have.

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