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2014/10/16 ¤W¤È 12:02:04

jquery Programming Glossary: atan

jQuery rounded slider

http://stackoverflow.com/questions/10186135/jquery-rounded-slider

.mouseup function e mdown false .mousemove function e if mdown var mPos x e.clientX elPos.x y e.clientY elPos.y var atan Math.atan2 mPos.x radius mPos.y radius deg atan Math.PI 180 180 final 0 360 positive degrees from mouse position X Math.round.. e mdown false .mousemove function e if mdown var mPos x e.clientX elPos.x y e.clientY elPos.y var atan Math.atan2 mPos.x radius mPos.y radius deg atan Math.PI 180 180 final 0 360 positive degrees from mouse position X Math.round radius.. e if mdown var mPos x e.clientX elPos.x y e.clientY elPos.y var atan Math.atan2 mPos.x radius mPos.y radius deg atan Math.PI 180 180 final 0 360 positive degrees from mouse position X Math.round radius Math.sin deg Math.PI 180 Y Math.round..

Rotate sprite javascript

http://stackoverflow.com/questions/3851896/rotate-sprite-javascript

the cannon loc in the dom var cannonX obj.cannon .offset .left var cannonY obj.cannon .offset .top Get radians using atan2 var radians Math.atan2 e.pageY cannonY e.pageX cannonX Convert to degrees var degrees radians 180 Math.PI And this is where.. dom var cannonX obj.cannon .offset .left var cannonY obj.cannon .offset .top Get radians using atan2 var radians Math.atan2 e.pageY cannonY e.pageX cannonX Convert to degrees var degrees radians 180 Math.PI And this is where I am I mean since.. 90 . Pay attention to the fact that the screen coordinates x and y increase right and down . This makes the degrees of atan work clockwise instead of the usual counter clockwise in coordinate systems where x and y increase right and up . I added..