Exporting canvas to PDF

tobystereo 2016-04-18 21:03:10 UTC #1

I would love to find a way to export the C4 canvas as a PDF or SVG. Is there a way to do this, or would I have to go for UIGraphicsPDFContext and lose all C4 functions?

travis 2016-04-19 08:21:16 UTC #2

I've done this before, but need to dig up some sample code for you. Can get you something by Wed. Also, shouldn't need to lose the C4 functions... I think the trick is to write a drawInContext method similar to render() which can be found in the View class.

tobystereo 2016-04-19 08:34:32 UTC #3

That would be awesome. The standard documentation for creating PDFs seemed a little cumbersome and incompatible with how C4 draws, since everything needs to be placed in a rectangle.

travis 2016-04-20 04:55:34 UTC #4

Voila

I add kept a reference of all shapes in an array. Not sure if it's the best technique, but definitely hackable.

gist.github.com

https://gist.github.com/C4Framework/ff004c43c8b0826e763f7afba82802a7

WorkSpace.swift

import UIKit

class WorkSpace: CanvasController {
    var pdfContext: CGContext!
    var shapes: [Shape]!
    override func setup() {
        shapes = [Shape]()
        for i in 0..<10 {
            let center = Point(Double(i) * 30.0, Double(i) * 30.0)
            let circle = Circle(center: center, radius: 30.0)

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tobystereo 2016-04-21 14:10:47 UTC #5

Awesome, thanks.
This works nicely.