Processing Forum

Use of Manual Word Wrap Function by Shiffman

[3 Replies]
- 06-Dec-2012 10:01 AM
- Forum: Programming Questions
I came across this function in my search for a MANUAL word wrap function:

http://wiki.processing.org/w/Word_wrap_text

It would be perfect for my application, except it does not work. If anyone can take a look at why it creates a null pointer exception apparently at this line:
```
w += textWidth(c); // accumulate width
```
it would save me countless hours and possibly days of trying to figure out my own version, as I am terrible at fixing other people's code. Below is the example function set-up to test for convenience sake:
String test;

void setup() {

size(screen.width, screen.height);

test = "Work function, work. Please.";

}

void draw() {

println(wordWrap(test, screen.width));

noLoop();

}

ArrayList wordWrap(String s, int maxWidth) {

// Make an empty ArrayList

ArrayList a = new ArrayList();

float w = 0; // Accumulate width of chars

int i = 0; // Count through chars

int rememberSpace = 0; // Remember where the last space was

// As long as we are not at the end of the String

while (i < s.length()) {

// Current char

char c = s.charAt(i);

w += textWidth(c); // accumulate width

if (c == ' ') rememberSpace = i; // Are we a blank space?

if (w > maxWidth) { // Have we reached the end of a line?

String sub = s.substring(0,rememberSpace); // Make a substring

// Chop off space at beginning

if (sub.length() > 0 && sub.charAt(0) == ' ') sub = sub.substring(1,sub.length());

// Add substring to the list

a.add(sub);

// Reset everything

s = s.substring(rememberSpace,s.length());

i = 0;

w = 0;

}

else {

i++; // Keep going!

}

}

// Take care of the last remaining line

if (s.length() > 0 && s.charAt(0) == ' ') s = s.substring(1,s.length());

a.add(s);

return a;

}

OpenGL - Nothing Happens When Running Tweaked Version of Moving Linear Gradient

[2 Replies]
- 25-Jan-2012 10:59 AM
- Forum: Core Library Questions
I have changed the example sketch of Linear Gradient, so the gradient moves.

Unfortunately, there are horizontal scan lines when I run it. P2D improves it a little, yet I was hoping OPENGL would improve the appearance, but it does not work. Just a blank grey screen. I am guessing OPENGL does not handle the set() function?

OPENGL works fine on othe Processing sketches on my mac.

Here's the code:
import processing.opengl.*;

int w, h;

int Y_AXIS = 1;

int X_AXIS = 2;

int b1dir = 1;

int b2dir = 1;

float x1;

float y1;

int x1dir;

int y1dir;

color b1;

color b2;

color b3;

void setup(){

w = screen.width;

h = screen.height;

size(w, h, OPENGL);



//smooth();



x1 = 0;

y1 = 600;

x1dir = 1;

y1dir = -1;



b1 = color(69, 139, 116);

b2 = color(205, 38, 38);

b3 = color(0, 0, 0);

}

void draw() {

background(0);



setGradient(0, int(y1), width, 100, b3, b1, Y_AXIS);



setGradient(0, int(y1) + 100, width, 100, b1, b2, Y_AXIS);



setGradient(0, int(y1) + 200, width, 100, b2, b3, Y_AXIS);



y1 += y1dir * 1;



if(y1 <= -200) {

y1 = 600;

}

}

void setGradient(int x, int y, float w, float h, color c1, color c2, int axis ){

// calculate differences between color components

float deltaR = red(c2)-red(c1);

float deltaG = green(c2)-green(c1);

float deltaB = blue(c2)-blue(c1);

// choose axis

if(axis == Y_AXIS){

/*nested for loops set pixels

in a basic table structure */

// column

for (int i=x; i<=(x+w); i++){

// row

for (int j = y; j<=(y+h); j++){

color c = color(

(red(c1)+(j-y)*(deltaR/h)),

(green(c1)+(j-y)*(deltaG/h)),

(blue(c1)+(j-y)*(deltaB/h))

);

set(i, j, c);

}

}

}

else if(axis == X_AXIS){

// column

for (int i=y; i<=(y+h); i++){

// row

for (int j = x; j<=(x+w); j++){

color c = color(

(red(c1)+(j-x)*(deltaR/h)),

(green(c1)+(j-x)*(deltaG/h)),

(blue(c1)+(j-x)*(deltaB/h))

);

set(j, i, c);

}

}

}

}

Processing 135, Documentation and /or What OS Will Work (Mac)

[2 Replies]
- 04-Jan-2012 03:46 PM
- Forum: Integration and Hardware
Could someone please point me to Processing version 135 documentation (i forgot where it is) or hopefully answer what was the highest Mac OS that worked with it.

Thanx, my old program is stuck in pre 1.0 processing and need to order proper mac mini and OS to run it.

Particle System Docs

[2 Replies]
- 05-Sep-2011 07:16 AM
- Forum: Core Library Questions
I am having trouble locating documentation / functions list of Processing particle systems. All I see is examples, no reference, any help please .?

Combining Network Library with an HTML Website

[0 Replies]
- 07-Apr-2011 09:16 AM
- Forum: Core Library Questions
Is anyone aware of a simple manner to use a Client / Server set-up on an HTML page .?

For example, I have a HTML page set-up on one machine (Client) and when one clicks on an image on this machine, it sends appropriate message to other machine (Server), and it say plays a video associated with image clicked upon.

Network Library Tutorial

[2 Replies]
- 05-Apr-2011 08:42 AM
- Forum: Core Library Questions
Is anyone aware of a tutorial link that will guide me through using the Network library?

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