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Rotating Sprite (Read 433 times)
snarkman
Rotating Sprite
Jun 18th, 2007, 7:36am  
Hey,

I'm trying to rotate a sprite to follow the mouse. There is only Corner and corners image modes and this, as I can see is the problem. Just trying to do it in the Sprite example before I apply it. Have looked at arctangent but to no avail. Any help would be great.
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snarkman
Re: Rotating Sprite
Reply #1 - Jun 18th, 2007, 9:31am  
 
Ok this works alright. Sure its not the best way but meh.




PImage teddy;
 
 

Teddy[] myTeddy;
float xpos;
float ypos;
float drag = random(30, 100);
 
void setup()
{
 size(600,600);
 frameRate(60);
 teddy = loadImage("teddy.gif");
 myTeddy = new Teddy[3];
 
 for (int i = 0; i < 3; i++)
 {
   myTeddy[i] = new Teddy();
}

 
}

void draw()
{
 background(102);
 
 float difx = mouseX - xpos-teddy.width/2;
 if(abs(difx) > 1.0) {
   xpos = xpos + difx/drag;
   xpos = constrain(xpos, 0, width-teddy.width);
 }  
 
 float dify = mouseY - ypos-teddy.height/2;
 if(abs(dify) > 1.0) {
   ypos = ypos + dify/drag;
   ypos = constrain(ypos, 0, height-teddy.height);
 }
 
 for (int i = 0; i < 3; i++)
 {
   myTeddy[i].update(mouseX, mouseY);
   myTeddy[i].run();
 }

 
 
}

class Teddy
{
 

 float angle = 0.0;
 float ex, ey;
 
 Teddy(){
 ex = xpos;
 ey = ypos;
 }
 
 void update(float mx, float my)
 {
   angle = atan2(my - height/2, mx - width/2) ;
 }
 
 void run()
 {
 pushMatrix();  

 translate( xpos+teddy.width/2, ypos+teddy.height/2,);
 rotate(angle - degrees(90));
 translate( -teddy.width/2, -teddy.height/2);
 image(teddy, 0, 0);

 popMatrix();


}}
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