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How do I keep the box from rotating when the mouse is not being dragged?

[1 Reply]
- 04-Feb-2013 03:23 AM
- Forum: Programming Questions
So i only want the box to rotate when the mouse is pressed down and I can't seem to figure out how to do it. Here's my code:

// current location

float locX;

float locY;

// target location

float targetX;

float targetY;

// starting position

float startX;

float startY;

// speed

float speed = 0.2;

// animation duration

float duration;

// animation start time

float startTime;

boolean bIsAnimating;



void setup() {

size( 500, 500 );

// set it to position

locX = width/2.0;

locY = height/2.0;

// make its target position equal to it's current position by default - no moving

targetX = locX;

targetY = locY;



startX = locX;

startY = locY;

bIsAnimating = false;

}

void draw() {

background(255);



{

float angle = atan2( mouseY - height/2, mouseX - width/2 );

translate(locX,locY);

rotate( angle );

fill(0);

rectMode(CENTER);

rect(0, 0, 50, 50);



}

if ( bIsAnimating )

{

float timePassed = (millis() - startTime)/1000.0f;

if ( timePassed < duration )

{

// use Penner easing equation to interpolate to desired end position

// if only "easeInQuad" - square starts off slow and moves fast

locX = easeInOutQuad(timePassed, startX, targetX-startX, duration);

locY = easeInOutQuad(timePassed, startY, targetY-startY, duration);

}

else

{

// we're done

PApplet.println( "done animating: " + millis() );

locX = targetX;

locY = targetY;

bIsAnimating = false;

}

}

// noStroke();

// fill( 0);

// rectMode( CENTER );

//

// rect( locX, locY, 50, 50 );

}

void mouseDragged() {

// new target

targetX = mouseX;

targetY = mouseY;



duration = 0.1; // take 2 seconds



startX = locX;

startY = locY;



// get the animation's start time

// millis() returns how many milliseconds have passed since the application started running

startTime = millis();



PApplet.println( "startTime: " + startTime );

bIsAnimating = true;

}

// Rober Penner's easing equations

public float easeInQuad(float t, float b, float c, float d)

{

return c*(t/=d)*t + b;

}

public float easeOutQuad(float t, float b, float c, float d)

{

return -c * (t/=d)*(t-2) + b;

}

public float easeInOutQuad(float t, float b, float c, float d)

{

if ((t/=d/2) < 1) return c/2*t*t + b;

return -c/2 * ((--t)*(t-2) - 1) + b;

}

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