Clipping

Use clip() to turn the current path into a clipping region, masking any graphics outside the path. clippreserve() keeps the current path, but also uses it as a clipping region. clipreset() resets it. :clip is also an action for drawing functions like circle().

sethue("grey50")
setdash("dotted")
circle(O, 100, :stroke)
circle(O, 100, :clip)
sethue("magenta")
box(O, 125, 200, :fill)

simple clip

Luxor.clip — Function

clip()

Establish a new clipping region by intersecting the current clipping region with the current path and then clearing the current path.

An existing clipping region is enforced through and after a gsave()-grestore() block, but a clipping region set inside a gsave()-grestore() block is lost after grestore(). [?]

source

Luxor.clippreserve — Function

clippreserve()

Establish a new clipping region by intersecting the current clipping region with the current path, but keep the current path.

source

Luxor.clipreset — Function

clipreset()

Reset the clipping region to the current drawing's extent.

source

This example uses the built-in function that draws the Julia logo. The clip action lets you use the shapes as a mask for clipping subsequent graphics, which in this example are randomly-colored circles:

function draw(x, y)
    foregroundcolors = Colors.diverging_palette(rand(0:360), rand(0:360), 200, s = 0.99, b=0.8)
    gsave()
    translate(x-100, y)
    julialogo(action=:clip)
    for i in 1:500
        sethue(foregroundcolors[rand(1:end)])
        circle(rand(-50:350), rand(0:300), 15, :fill)
    end
    grestore()
end

currentwidth = 500 # pts
currentheight = 500 # pts
Drawing(currentwidth, currentheight, "/tmp/clipping-tests.pdf")
origin()
background("white")
setopacity(.4)
draw(0, 0)
finish()
preview()