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Stroke Start & End
Stroke Start & End Points
You can define the start and end points used to draw the stroked outline of a shape. The values must be in the range 0...1
with 0
representing the start of the path and 1
the end. Values in between zero and one are interpolated linearly along the path length.
shape . strokeStart = 0.25
shape . strokeEnd = 0.75
Example
let dy = Vector ( x : 0 , y : 2.0 )
//create and array of points to use for lines
//start out one iteration below 0
var points = ( Point () - dy , Point ( canvas . width , 0.0 ) - dy )
//figure out the total number of lines to draw
let totalLineCount = canvas . height / 2.0 //default line width of 1.0
//figure out displacement of strokeStart and strokeEnd
let strokeDisplacement = 0.5 / totalLineCount
for i in 0 ..< Int ( totalLineCount ) {
points . 0 += dy
points . 1 += dy
//create a new line
let newLine = Line ( points )
//determine the current displacement of the ends of the line
let ds = strokeDisplacement * Double ( i )
newLine . strokeStart = 0.5 - ds
newLine . strokeEnd = 0.5 + ds
canvas . add ( newLine )
}