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en:design_guide_ellipse [2020/12/01 04:00]
JSCAD Editor 		en:design_guide_ellipse [2022/04/13 07:19] (current)
rozek included "require" statements, corrected mistakes
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 ==== Ellipse ==== ==== Ellipse ====
 +
 +{{ :wiki:jscad-ellipse.svg?nolink | Ellipse }}
 +
 +A two dimensional shape that surrounds two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant.
 +
 +The ''radius'' determines the size of the ellipsoid about X and Y axis. Ellipsoids can be created at a requested ''center''. The ''segments'' specify the number of segments to create per full rotation. 
 +
 +Defaults:
 +  * radius : [1, 1]
 +  * center : [0, 0]
 +  * startAngle : 0
 +  * endAngle : PI * 2
 +  * segments: 32
 +
 +<code javascript>
 +const { ellipse } = require('@jscad/modeling').primitives
 +
 +const myshape = ellipse({radius: [5, 10]})
 +const myshape = ellipse({radius: [5, 10], center: [5, 5], startAngle: Math.PI / 2, endAngle: Math.PI, segments: 64})
 +</code>
  
 === Circle === === Circle ===
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 A two dimensional shape made by drawing a curve that is always the same distance from a center. All points are the same distance from the center. A two dimensional shape made by drawing a curve that is always the same distance from a center. All points are the same distance from the center.
  
-{{ :wiki:mathisfun_circle.svg?nolink | Circle }}+{{ :wiki:jscad-circle.svg?nolink | Circle }}
  
 //[[http://www.mathsisfun.com/algebra/circle-equations.html|Learn about circles at MathIsFun.com]]// //[[http://www.mathsisfun.com/algebra/circle-equations.html|Learn about circles at MathIsFun.com]]//
  
-The following show examples of creating circles. The radius specifies the size. The resolution option determines the number of segments to create in 360 degrees of rotation.+The ''radius'' specifies the size across both X and Y axis. Circles can be created at a requested ''center''. The ''segments'' specify the number of segments to create per full rotation. 
  
 Defaults: Defaults:
   * radius : 1   * radius : 1
-  * center : [0,0] +  * center : [0, 0] 
-  * resolution: defaultResolution2D (32)+  * segments: 32
  
 <code javascript> <code javascript>
-let c1 = circle(1)  +const { circle } = require('@jscad/modeling').primitives 
-let c2 = circle({r: 2, fn:5})            // fn = number of segments to approximate the circle + 
-let c3 = circle({r: 3, center: true})+const myshape = circle({radius: 10}) 
 +const myshape = circle({radius: 10, center: [5, 5], startAngle: Math.PI / 2, endAngle: Math.PI, segments: 64})
 </code> </code>