August 2006
Intermediate to advanced
1018 pages
34h 13m
English
Content preview from JavaScript: The Definitive Guide, 5th Edition
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Name
CanvasRenderingContext2D.arc( ): add an arc to the current subpath of a canvas, using a center point and radius
Synopsis
void arc(floatx, floaty, floatradius, floatstartAngle,endAngle, booleancounterclockwise)
Arguments
-
x, y The coordinates of the center of the circle describing the arc.
-
radius The radius of the circle describing the arc.
-
startAngle, endAngle The angles that specify the start and end points of the arc along the circle. These angles are measured in radians. The three o’clock position along the positive X axis is an angle of 0, and angles increase in the clockwise direction.
-
counterclockwise Whether the arc is traversed counterclockwise (
true) or clockwise (false) along the circle’s circumference.
Description
The first five arguments to this method describe specify a start point and an end point on the circumference of a circle. Invoking this method adds a straight line between the current point and the start point to the current subpath. Next it adds the arc along the circumference of the circle between the start and end points to the subpath. The final argument specifies the direction in which the circle should be traversed to connect the start and end points. This method leaves the current point set to the end point of the arc.
See Also
CanvasRenderingContext2D.arcTo(
)
|
CanvasRenderingContext2D.beginPath(
)
|
CanvasRenderingContext2D.closePath(
)
|
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.