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Trying to do something like a cat's cradle but can't changed the string's position.

[0 Replies]
- 29-Oct-2012 10:00 AM
- Forum: Contributed Library Questions
Hi, every one, I am a novice in processing and I encounter a problem. There are three strings in this sketch, I can place the strings in same positions when clicked the mouse . But I want to place three strings in different positions. How can I do this?
Can anyone help me?

Thanks!!!

This code is written by Karl Hiner. And I recreate some effects.

/* OpenProcessing Tweak of *@* http://www.openprocessing.org/sketch/42428*@* */

/* !do not delete the line above, required for linking your tweak if you re-upload */

/**********************************************************************

Pluck the string by holding the mouse down and releasing.

Adjust the speed, damping, and number of harmonics of the simulation.

The equation for this simulation is due to:

http://www.oberlin.edu/faculty/brichard/Apples/StringsPage.html

***********************************************************************/

import controlP5.*;

ControlP5 controlP5;

ControlP5 controlP52;

final float PI_SQUARED = PI*PI;

boolean plucked = false;

int t = 0; // time since pluck

int m_tot = 10; // harmonics - each harmonic requires more computation

float c = 100; // speed

float amp = 0; // amplitude

float d; // x position of pluck

float damp = 1.1; // damping constant

void setup() {

size(800, 600, P2D);

strokeWeight(4);

smooth();

controlP5 = new ControlP5(this);

controlP5.setColorLabel(0);

controlP5.addSlider("damp", 1, 1.35, 1.1, 5, 10, 80, 15);

controlP5.addSlider("c", 20, 300, 100, 5, 30, 80, 15).setLabel("speed");

controlP5.addSlider("m_tot", 1, 15, 10, 5, 50, 80, 15).setLabel("harmonics");

}

void draw_a_string(float y_pos) {

if (plucked) {

t++;

amp/= damp;

}

float w = PI*(c/width);

beginShape();

if (plucked) {

for (int x = 0; x < width; x += 5) {

float sum = 0;

for (int m = 1; m <= m_tot; ++m)

sum += (1.0/(m*m)*sin((m*PI_SQUARED*d)/width)*sin((m*PI*x)/width)*cos(m*w*t));

float y = (1.5*amp*width*width)/(PI_SQUARED*d*(width - d))*sum;

y += y_pos;

vertex(x, y);

}

}

else {

vertex(0, y_pos);

vertex(d, y_pos + amp);

vertex(width - 5, y_pos);

}

endShape();

}

void draw() {

noFill(); //or it will look like triangle

background(0);

//set the string color

stroke(255, 30, 56);

//draw a string. Parameter is the vertical height that the string is drawn.

draw_a_string(height * 0.25);

//set the string color

stroke(30, 255, 56);

//draw a string. Parameter is the vertical height that the string is drawn.

draw_a_string(height * 0.5);

//set the string color

stroke(30, 56, 255);

//draw a string. Parameter is the vertical height that the string is drawn.

draw_a_string(height * 0.75);

controlP5.draw(); // we need to manually draw controlP5 when using P2D

}

void mousePressed() {

if (!controlP5.window().isMouseOver()) {

plucked =false ;

t = 0;

amp = mouseY - height/2;

d = mouseX;

}

}

void mouseDragged() { // when mouse are drugged

if (!controlP5.window().isMouseOver()) {

d = mouseX;

amp = mouseY - height/2;

}

}

void mouseReleased() {

plucked = false;

//reset the string back to 0

//amp = 0;

}

void damp(float value) {

damp = value;

}

void c(float value) {

c = value;

}

void m_tot(float value) {

m_tot = (int)value;

}

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