Mathematical problem XY, PI, Angle,

[Jonforum]

Hi
I forgot the equation to calculate a distance traveled with the angle pi

Here my context
//Picture 1 have position [x,y,angle]
P1xy = [10, 10, 0];
//Picture 2 have position with picture1 [x,y]
P2xY = [(P1xy[0]+10), (P1xy[1]+20)]

But if the angle of my picture 1 change
Which formula I will be able to use, to take into consideration, the angle distance
And picture2 follow xy of picture1 with angle distance
thanks

 

[Quxios]

Not sure what you mean. Changing the angle of the picture isn't going to change that pictures x/y position. This is because the it's anchor/pivot are it's x/y position so it will rotate on that position. Now this is a different story if you're trying to get a position inside the picture besides it's 0,0 point, since those will change when its angle changes.

 

[mogwai]

http://www.helixsoft.nl/articles/circle/sincos.htm
I was getting into this tutorial ^ when I wrote my race car movement script. All you need to remember is sin and cos.

// angle = 1 to 360 * radian;
// radian = Math.PI / 180;
speedX = speed * Math.cos ( angle );
speedY = speed * Math.sin ( angle );
// _x or _realX += speedX;
// _y or _realY += speedY;

 

[Jonforum]

i find my way thanks

for (var i = 0; i < steps; i++) {
    x = (posx+ radius * Math.cos(2 * Math.PI * i / steps));
    y = (posy+ radius * Math.sin(2 * Math.PI * i / steps));
     $gameScreen.showPicture(PID++, filename, 1, x, y, 100, 100, 255, 0); //#b43a3a ORBS
}