# Display text as a wave

this is my code…

``````int xspace = 5;   // How far apart should each horizontal location be spaced
int w;              // Width of entire wave

float theta = 0.0;  // Start angle at 0
float amplitude = 80.0;  // Height of wave
float period = 700.0;  // How many pixels before the wave repeats
float dx;  // Value for incrementing X, a function of period and xspacing
float[] yvalues;  // Using an array to store height values for the wave

void setup() {
size(640, 360);
w = width+16;
background(255);
dx = (TWO_PI / period) * xspace;
yvalues = new float[w/xspace];
calWave();
drawWave();
}

void draw() {
;
}

void calWave() {
// Increment theta (try different values for 'angular velocity' here
theta += 0.02;

// For every x value, calculate a y value with sine function
float x = theta;
for (int i = 0; i < yvalues.length; i++) {
yvalues[i] = sin(x)*amplitude;
x+=dx;
}
}

void drawWave() {

// A simple way to draw the wave with an ellipse at each location
for (int x = 0; x < yvalues.length; x++) {
ellipse(x*xspace, height/2+yvalues[x], 5, 5);
}
}
``````

well, instead of the circle print a character? is that the idea?

and your code must be formatted ( in PDE by [ctrl][t] )
and pasted here
`</> Preformatted text` button

so it looks like this:

``````int xspace = 15; //________ How far apart should each horizontal location be spaced
int w; //__________________ Width of entire wave
float theta = 0, dt =0.02; //Start angle at 0
float amplitude = 80.0; //_ Height of wave
float period = 640.0; //___ How many pixels before the wave repeats
float dx; //_______________ Value for incrementing X, a function of period and xspacing
float[] yvalues; //________ Using an array to store height values for the wave

void setup() {
size(640, 360);
w = width+16;
background(255);
dx = (TWO_PI / period) * xspace;
yvalues = new float[w/xspace];
println("xspace "+xspace+" w "+w +" dx "+dx);
textSize(20);
fill(0);
}

void draw() {
background(200, 200, 0);
calWave();
drawWave();
}

void calWave() {
theta += dt; //__________ Increment theta (try different values for ‘angular velocity’ here
for (int i = 0; i < yvalues.length; i++)
yvalues[i] = sin(theta+i*dx)*amplitude; // For every x value, calculate a y value with sine function
}

void drawWave() { //_______ A simple way to draw the wave with an ellipse at each location
for (int x = 0; x < yvalues.length; x++) {
point(x*xspace, height/2);
//noFill();
//ellipse(x*xspace, height/2+yvalues[x], xspace, xspace);
text("O", x*xspace, height/2+yvalues[x]); // here need random chars?
}
}

``````
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