Raphael newbie: what are cx, rx, ox in Raphael.js

In Raphael.js documentation of official website, there are ma开发者_运维技巧ny parameters used, like cx, ox, rx, but what are the definitions for these parameters, can someone explain to me what are they represented for?

Where can I find the definitions for these parameters?

They are listed right there in the documentaiton you linked:

• rx - Horisontal radius
• cx - X coordinate of the origin of rotation

ox is just a variable they use to store data.

• CX - the x-axis coordinate of the center of the circle, or ellipse
• CY -the y-axis coordinate of the center of the circle, or ellipse
• RX - horisontal radius of the ellipse
• RY - vertical radius of the ellipse

Take a look here: Raphael Documentation - Element.attr. The parameter descriptions you are looking for are explained there.

So cx denotes the center x coordinate while rx defines the horizontal (x-axis) radius of an ellipse or circle. Same applies for vertical direction with y.