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trying to get spring to work without mouse input
[0 Replies]
27-Feb-2011 01:17 PM
Forum:
Programming Questions
// i was thinking maybe sin or cosin but i cant figure it out
// Spring drawing constants for top bar
int s_height = 16; // Height
int left = 50; // Left position
int right = 150; // Right position
int max = 100; // Maximum Y value
int min = 20; // Minimum Y value
boolean over = false; // If mouse over
boolean move = false; // If mouse down and over
// Spring simulation constants
float M = 0.8; // Mass
float K = 0.2; // Spring constant
float D = 0.92; // Damping
float R = 60; // Rest position
// Spring simulation variables
float ps = 60.0; // Position
float vs = 0.0; // Velocity
float as = 0; // Acceleration
float f = 0; // Force
void setup()
{
size(200, 200);
rectMode(CORNERS);
noStroke();
}
void draw()
{
background(102);
updateSpring();
drawSpring();
}
void drawSpring()
{
// Draw base
fill(0.2);
float b_width = 0.5 * ps + -8;
rect(width/2 - b_width, ps + s_height, width/2 + b_width, 150);
// Set color and draw top bar
if(over || move) {
fill(255);
} else {
fill(204);
}
rect(left, ps, right, ps + s_height);
}
void updateSpring()
{
// Update the spring position
if(!move) {
f = -K * (ps - R); // f=-ky
as = f / M; // Set the acceleration, f=ma == a=f/m
vs = D * (vs + as); // Set the velocity
ps = ps + vs; // Updated position
}
if(abs(vs) < 0.1) {
vs = 0.0;
}
// Test if mouse is over the top bar
if(mouseX > left && mouseX < right && mouseY > ps && mouseY < ps + s_height) {
over = true;
} else {
over = false;
}
// Set and constrain the position of top bar
if(move) {
ps = mouseY - s_height/2;
if (ps < min) { ps = min; }
if (ps > max) { ps = max; }
}
}
void mousePressed() {
if(over) {
move = true;
}
}
void mouseReleased()
{
move = false;
}
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