phaser place on ellipse

Phaser Place on Ellipse#

If you are trying to place your Phaser game object on an elliptical path, then you may want to consider using the following formula:

x = centerX + Math.cos(angle) * a;
y = centerY + Math.sin(angle) * b;

Explanation:#

• centerX and centerY represent the center of your ellipse.
• a and b represent the length of the semi-major and semi-minor axis of your ellipse respectively.
• angle represents the angle at which you want to place your object on the ellipse.
• The Math.cos and Math.sin functions are used to calculate the x and y coordinates of your object respectively.

Example:#

Suppose you want to place an image of a spaceship on an elliptical path centered at (300, 300) with a semi-major axis of 200 and a semi-minor axis of 150. To make the spaceship move along the elliptical path, you will need to update its position inside the game loop.

// define initial angle
let angle = 0;

function update() {
  // update angle
  angle += 0.01;

  // calculate new position
  let x = 300 + Math.cos(angle) * 200;
  let y = 300 + Math.sin(angle) * 150;

  // set new position
  spaceship.x = x;
  spaceship.y = y;
}

This code will make the spaceship move along the elliptical path with a constant angular velocity of 0.01 radians per frame.