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Index › Programming Questions & Help › Programs › blinking while mouseMoved()
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blinking while mouseMoved() (Read 720 times)
mnt
blinking while mouseMoved()
Feb 3rd, 2010, 3:47pm  
Hi!
I just discoverd processing  and and recently started programming a little "sketch"  Roll Eyes

I was trying to programming a fraktal - Pythagoras tree (search in wikipedia for Pythagoras_tree). It works quite well. But there is kind of a problem. I extend my sketch by the function mouseMoved(). it calculates the angle(Thales)  in percent (from 0 to 1) every time when the mousex-Value are changing. But i reconized that the window is starting to blinking/flashing in random way every time when i move the mousecursor over the screen. so its kind of annoying. I wonder if there is someone who can help me fix that problem.

Code:

float k=0.5; 
void setup()
{  
    noLoop();
    smooth();
    size(screen.width,700);
    background(0);
}
void draw()
{
PVector [] trunk = new PVector[2];
trunk[0]=new PVector(width/2-25,height-40);
trunk[1]=new PVector(width/2+25,height-40);

drawPythagorasTress(trunk,k);
  
}
void mouseMoved() 
{
 
  float c=mouseX;
  if(((c/1000)>0.1)&&((c/1000)<0.85))
  {
  k=(c/1000);
  }
  println(k);
  
  
  background(0);
  redraw();

}

void drawPythagorasTress(PVector [] AB, float k)
{
  
  if(AB[0].dist(AB[1])>=1)
  {
  drawRect(AB);
  PVector [] CD = new PVector[2];
    CD = calcRect(AB);
  PVector []  ThalesPoint = new PVector[1];
    ThalesPoint = ThalesPoint(AB, k);
  PVector [] newPoint1 = new PVector[2];
    newPoint1[0] = new PVector(CD[0].x,CD[0].y);
    newPoint1[1] = new PVector(ThalesPoint[0].x,ThalesPoint[0].y);
  PVector [] newPoint2 = new PVector[2];
    newPoint2[0] = new PVector(ThalesPoint[0].x,ThalesPoint[0].y);
    newPoint2[1] = new PVector(CD[1].x,CD[1].y);
  drawPythagorasTress(newPoint1,k);
  drawPythagorasTress(newPoint2,k);
  }


}

void drawRect(PVector [] AB)
{
    PVector [] CD = new PVector[4];
    CD = calcRect(AB);
    
    stroke(255);
    line(AB[0].x,AB[0].y,AB[1].x,AB[1].y);
    stroke(255);
    line(AB[1].x,AB[1].y,CD[1].x,CD[1].y);
    line(CD[1].x,CD[1].y,CD[0].x,CD[0].y);
    line(AB[0].x,AB[0].y,CD[0].x,CD[0].y);
}

PVector [] calcRect (PVector [] L)
{
  float dX=(L[1].x-L[0].x);
  float dY=(L[1].y-L[0].y);
  float cx,cy,dx,dy;
  
    PVector [] CD = new PVector[2];
    CD[0] = new PVector(L[0].x+dY,L[0].y-dX); // C
    CD[1] = new PVector(L[1].x+dY,L[1].y-dX); // D
    return CD;
}

PVector [] ThalesPoint(PVector[] L, float k)
{
  //Calculate angles
  float dX=L[1].x-L[0].x;
  float dY=L[1].y-L[0].y;
  float Xn= k*L[0].x + (1-k)*L[1].x - (1+sqrt(k*(1-k))) * (-dY);
  float Yn= k*L[0].y + (1-k)*L[1].y - (1+sqrt(k*(1-k))) * (dX);
  PVector [] ThalesPoint= new PVector[1];
  ThalesPoint[0] = new PVector(Xn,Yn);
return  ThalesPoint;
}
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blindfish
Re: blinking while mouseMoved()
Reply #1 - Feb 3rd, 2010, 4:10pm  
You're fighting with the draw loop!  You use noLoop(), but IIRC mouse events are only registered at the end of draw.  draw stops == no more mouse events...  I see very little when I run it.  Take out noLoop and redraw and move background(0) to draw() and it looks better to me, though a little slow (but also rather nice plant-like shapes):

Code:
float k=0.5; 
void setup()
{  
    //noLoop();
    smooth();
    size(screen.width,700);
    background(0);
}
void draw()
{
  background(0);
PVector [] trunk = new PVector[2];
trunk[0]=new PVector(width/2-25,height-40);
trunk[1]=new PVector(width/2+25,height-40);

drawPythagorasTress(trunk,k);
  
}
void mouseMoved() 
{
 
  float c=mouseX;
  if(((c/1000)>0.1)&&((c/1000)<0.85))
  {
  k=(c/1000);
  }
  println(k);
  
  
  
  //redraw();

}

void drawPythagorasTress(PVector [] AB, float k)
{
  
  if(AB[0].dist(AB[1])>=1)
  {
  drawRect(AB);
  PVector [] CD = new PVector[2];
    CD = calcRect(AB);
  PVector []  ThalesPoint = new PVector[1];
    ThalesPoint = ThalesPoint(AB, k);
  PVector [] newPoint1 = new PVector[2];
    newPoint1[0] = new PVector(CD[0].x,CD[0].y);
    newPoint1[1] = new PVector(ThalesPoint[0].x,ThalesPoint[0].y);
  PVector [] newPoint2 = new PVector[2];
    newPoint2[0] = new PVector(ThalesPoint[0].x,ThalesPoint[0].y);
    newPoint2[1] = new PVector(CD[1].x,CD[1].y);
  drawPythagorasTress(newPoint1,k);
  drawPythagorasTress(newPoint2,k);
  }


}

void drawRect(PVector [] AB)
{
    PVector [] CD = new PVector[4];
    CD = calcRect(AB);
    
    stroke(255);
    line(AB[0].x,AB[0].y,AB[1].x,AB[1].y);
    stroke(255);
    line(AB[1].x,AB[1].y,CD[1].x,CD[1].y);
    line(CD[1].x,CD[1].y,CD[0].x,CD[0].y);
    line(AB[0].x,AB[0].y,CD[0].x,CD[0].y);
}

PVector [] calcRect (PVector [] L)
{
  float dX=(L[1].x-L[0].x);
  float dY=(L[1].y-L[0].y);
  float cx,cy,dx,dy;
  
    PVector [] CD = new PVector[2];
    CD[0] = new PVector(L[0].x+dY,L[0].y-dX); // C
    CD[1] = new PVector(L[1].x+dY,L[1].y-dX); // D
    return CD;
}

PVector [] ThalesPoint(PVector[] L, float k)
{
  //Calculate angles
  float dX=L[1].x-L[0].x;
  float dY=L[1].y-L[0].y;
  float Xn= k*L[0].x + (1-k)*L[1].x - (1+sqrt(k*(1-k))) * (-dY);
  float Yn= k*L[0].y + (1-k)*L[1].y - (1+sqrt(k*(1-k))) * (dX);
  PVector [] ThalesPoint= new PVector[1];
  ThalesPoint[0] = new PVector(Xn,Yn);
return  ThalesPoint;
}


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Where is the what if the what is in why?
 
mnt
Re: blinking while mouseMoved()
Reply #2 - Feb 3rd, 2010, 4:27pm  
THANKS!  Cheesy solves my problem completly!

[Moderator's note: I removed the quote. No need to quote a whole answer, including code, since you are on the same thread. Bad habit from e-mail (where it is still a bad habit! Smiley)]
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« Last Edit: Feb 4th, 2010, 2:41am by PhiLho  »  
 
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