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dak1b2006
dak1b2006

smooth motion

in Programming Questions  •  4 months ago  
Hi,

I'm trying to make a movement system that causes an object such as a square to speed up from a stop while a key is being held down, and then coast to a stop when they key is released. I need help with the coding. 

This is what I have so far:

Copy code
  2. car[] cars;
  3. int x;

  5. void setup();
  6. size(600,600);
  7. car = new car[10];
  8. for(int i=0;i<cars.length;i++){
  9. cars[i] = new car(startX[i],startY[i]);
  10. }
  11. x=0;
  12. }

  14. void draw(){
  15. background(125);
  16. {
  17.     cars[i].drawcar();
  18.   }
  19. }

  21. void keyPressed(){ 
  22.   if( key >= '0' && key <= '9'){
  23.     x = key - '0';
  24.     return;
  25.   }
  26.   if(key == CODED)
  27.   {
  28.     if (keyCode == UP)
  29.     {
  30.       cars[x].moveUP();
  31.     }
  32.     else if (keyCode == DOWN)
  33.     {
  34.       cars[x].moveDOWN();
  35.     }
  36.     else if (keyCode == LEFT)
  37.     {
  38.       cars[x].moveLEFT();
  39.     }
  40.     else if (keyCode == RIGHT)
  41.     {
  42.       cars[x].moveRIGHT();
  43.     }
  44. }

Replies(6)

Jan Vantomme
Jan Vanto..

Re: smooth motion

4 months ago
You could take a look at the ijeomamotion library. It has lots of functionality to do smooth motions such as slowing down or speeding up.

dak1b2006
dak1b2006

Re: smooth motion

4 months ago
thanks for your response.
any other options? 
PhiLho
PhiLho

Re: smooth motion

4 months ago
Remark:
car = new car[10];
A bit ambiguous (for our eyes, not for the compiler!), no?
That's why we generally start class names with a capital letter:
Car[] cars = new Car[10];
(mmm, there was a typo in the quoted line, no?)

Perhaps you look for easing algorithms, if I understood you correctly. Have you tried to search this word from Processing.org?
dak1b2006
dak1b2006

Re: Re: smooth motion

4 months ago
PhiLho,

I rewrote the code:  The ball moves fine with the directional arrows...however when I release the directional arrow I want the ball to slightly ease in...not a sudden stop movement. I searched "easing algorithms" with no results. 

Copy code
  3. int ballX;
  4. int ballY;
  5. int radius;
  6. int ballSpeed;

  8. void setup()
  9. {
  10.   size(600, 600);
  11.   background(255, 255, 255);
  12.   smooth();
  13.   frameRate(60);

  15.   ballX = width/2;
  16.   ballY = height/2;
  17.   radius = 25;
  18.   ballSpeed = 10;
  19. }

  21. void draw()
  22. {
  23.   fill(255, 255, 255, 50);
  24.   noStroke();
  25.   rect(0, 0, width, height);

  27.   fill(255, 0, 0);
  28.   ellipse(ballX, ballY, radius*2, radius*2);
  29. }


  32. void keyPressed()
  33. {
  34.   if ( (keyCode == LEFT) && (ballX > radius) )
  35.   {
  36.     ballX = ballX - ballSpeed;
  37.   }

  39.   if ( (keyCode == RIGHT) && (ballX < width-radius) )
  40.   {
  41.     ballX = ballX + ballSpeed;
  42.   }

  44.   if ( (keyCode == UP) && (ballY > radius) )
  45.   {
  46.     ballY = ballY - ballSpeed;
  47.   }

  49.   if ( (keyCode == DOWN) && (ballY < height-radius) )
  50.   {
  51.     ballY = ballY + ballSpeed;
  52.   }
  53. }

PhiLho
PhiLho

Re: smooth motion

4 months ago
dak1b2006
dak1b2006

Re: Re: smooth motion

4 months ago
thanks!!
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