Processing Forum

Instance method not being called using a 2D array

[2 Replies]
- 08-Mar-2013 05:18 AM
- Forum: Programming Questions
I am probably missing something obvious, but I can't figure out where I am making a mistake.

there are 3 issues:

1. first object in the array doesn't set the color after initialization

2. setColor(..) is not called in the void draw() at all

3. getColor() method returns some weird value
2. Pixel [][] pixelsArray;
4. int numRows = 20;
5. float pixelSize = 30;
6. int screenSize = (int)pixelSize * numRows;
9. void setup()
10. {
11. size (screenSize, screenSize);
12. background(0);
13. pixelsArray = new Pixel [numRows][numRows];
14. for (int i = 0; i < numRows; i++)
15. {
16. for (int j = 0; j <numRows; j++)
17. {
18. pixelsArray[i][j] = new Pixel(i*pixelSize, j*pixelSize, pixelSize);
19. pixelsArray[i][j].setColor(color(0,0,255));
20. }
21. }
22. println(pixelsArray[1][0].getColor());
23. }
25. void draw()
26. {
27. pixelsArray[1][1].setColor(color(255,0,0));
28. }
31. class Pixel
32. {
33. color c;
34. float xPos;
35. float yPos;
36. float pixSize;
38. Pixel(float xPos, float yPos, float pixSize)
39. {
40. this.xPos = xPos;
41. this.yPos = yPos;
42. this.pixSize = pixSize;
43. rect(xPos,yPos,pixSize,pixSize);
44. }
46. void setColor(color c)
47. {
48. this.c = c;
49. fill(this.c);
50. }
52. color getColor()
53. {
54. return c;
55. }
56. }

How to save data from an online applet?

[4 Replies]
- 25-Jun-2012 05:48 AM
- Forum: General Discussion
I am planning to put an applet online and I would like to be able to record and save some of the user's clicks.
The applet is a kind of interactive form. I know very little how to do these kind of things. Could anyone advise me how I could do that?

Also, I have never put an applet online, how is that done?

Any hints, names of libs or anything are welcome...

thanks.

Load code from a text file

[3 Replies]
- 17-Jun-2012 06:45 AM
- Forum: General Discussion
Hey people,

I am curious what would be the easiest way to load code from a text file.

The idea would be to have a sort of start up code, like global variables, initialization etc,

then the program would load various functions from text files according to certain input.

so if i have an synthesizer as my input, depending on the pitch i could load and run different functions.

in the same way it would be fun to write code into a text file (by playing a synth), where different notes

would represent different keywords and parameters in processing, such as C1 = ellipse(), C#1 = line(), D1 = random(), G2 = 1, G#2 = 2, etc.

so reading from text, writing into text file, and loading and running text files as code.

I have used text files for loading settings, but looking just for some hints how actual code could be loaded.

thanks!

Recompiled library has function does not exist

[0 Replies]
- 20-Nov-2011 07:10 AM
- Forum: Library and Tool Development
Hi,

When adding a function to the ezgestures library. After compiling with eclipse I call within a sketch and I get the error: "function sayHello(); does not exist".

I used the template from de google code page to start the library and copied the ezgestures code in it.

then I renamed the packages so it's my own package and does not interfere with the ezgesture lib.

Then building has no errors.

Does anyone know why the function isn't seen by processing?

I also compiled the template example and added functions to that one and there is no problem at all and it finds the function. So what is the difference?

any clue in what this could be would be very welcome!

greetz, Aurimas

Smoothing noisy input data. Are there good ways?

[0 Replies]
- 09-Oct-2011 09:17 AM
- Forum: Programming Questions
Hey everyone,

I am looking for a good way to smooth noisy input. I will use noisy devices - a gyro and video tracked cursor data - they produce very jumpy data.

So far i have tried putting values in an array and averaging them. Works passably with small deviations. But i am guessing there should be something like a "lowpass filter" way of doing it, or even some others that i don't know.

Any ideas are very appreciated. (also on improving current code)

below is my code so far...
2. int buffSz = 10;
3. int[] myBufferX = new int[buffSz];
4. int[] myBufferY = new int[buffSz];
6. void setup() {
7. size(400, 400);
8. smooth();
9. }
10. void draw() {
11. background(0);
12. strokeWeight(2);
13. stroke(255);
14. fill(255);
17. addInt(width/2+(int)random(20), height/2+(int)random(20));
19. //println("avr X " +avrX());
20. //println("avr Y " +avrY());
21. ellipse(avrX(), avrY(), 40, 40);
22. }
24. //FIFO queue
26. void addInt(int newIntX, int newIntY) {
27. for (int i=buffSz-1; i>0; i--) {
28. myBufferX[i] = myBufferX[i-1];
29. }
31. for (int j=buffSz-1; j>0; j--) {
32. myBufferY[j] = myBufferY[j-1];
33. }
34. myBufferX[0] = newIntX;
35. myBufferY[0] = newIntY;
36. }
38. //average of Y coordinates
40. int avrX() {
42. int total=0;
43. int avrX=mouseX;
45. for (int i=buffSz-1; i>=0; i--) {
46. total+=myBufferX[i];
47. avrX=total/buffSz;
49. }
50. return avrX;
52. }
54. // average of Y coordinates
56. int avrY() {
58. int total=0;
59. int avrY=mouseY;
61. for (int b=buffSz-1; b>=0; b--) {
62. total+=myBufferY[b];
63. avrY=total/buffSz;
64. //println(avrY);
65. }
66. return avrY;
67. }

Scroll text when it reaches the bottom of the window.

[4 Replies]
- 25-Sep-2011 06:40 AM
- Forum: Programming Questions
Hey everyone,

could anyone give me some tips how to make the text scroll.

At the moment when the text exceeds the bottom of the window it becomes invisible, cos it goes down to an imaginary space below.

I am trying to think of how to delete the first line and shift the whole text up, so there is a new empty line for more text. Basically making text scroll while typing.

Thanks in advance.
2. import fullscreen.*;
4. FullScreen fs;
6. PFont f1;
8. String txt="";
9. int fntSz=100;
10. int fntNum=1;
12. void setup() {
13. size(screen.width, screen.height); // set size
14. smooth();
15. background(255);
16. fs = new FullScreen(this); // Create the fullscreen object
17. fs.enter(); // enter fullscreen mode
18. f1 = loadFont("SOUND_08_07-48.vlw");
20. }
22. void draw() {
23. noCursor();
24. background(255);
25. textFont(f1, fntSz);
26. //textFont(f2, 36);
27. fill(0);
28. stroke(0);
29. textAlign(LEFT);
30. text(txt, width/20, height/20, width-width/10, height);
31. }
33. void keyPressed() {
34. if (keyCode == BACKSPACE) {
35. if (txt.length() > 0) {
36. txt = txt.substring(0, txt.length()-1);
37. }
38. }
39. else if (keyCode == DELETE) {
40. txt = "";
41. }
42. else if (keyCode != SHIFT) {
43. txt = txt + key;
44. }
45. }

How to load fonts other than vlw?

[3 Replies]
- 22-Sep-2011 01:47 PM
- Forum: General Discussion
Hey guys,

I hope you can help me find the solution to my problem.

I have a bunch of otf fonts (open type font), that i want to use. I know processing accepts vlw, so mine wont work. But then, i go to tools>create fonts in order to convert them, and my otf fonts are not visible, just the ones that are in office folder and i am not sure what type they are.

is there a way to soleve this? Should i somehow convert otf to vlw? is there software for that?

(on mac)

thanks in advance.

aurimas

Camera-projector calibration. Needed advice.

[2 Replies]
- 19-Nov-2010 02:21 PM
- Forum: Integration and Hardware
Could anyone advise me how to do four point camera calibration in a way that x y coordinates of the screen would be the same as camera (which is tracking the screen) coordinates? Like Johnny Lee does with his Wii remote. I am using the processing video library. I am new to programming, so any help is appreciated.

Activity Trend