Donatello preview integration with nodes.

[Jackymancs4]

Description

I have implemented two new nodes.

CanvasFromPreview creates a canvas using data from the Paper preference.

TurtleToPreview pipes the turtle input into the preview renderer. That range slider works great.

Fixes #835

Type of change

• Add two new nodes

How Has This Been Tested?

• I've created various nodes and graphs. See the screenshot for an example of both nodes used.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[Jackymancs4]

CanvasFromPreview could use the shift paper setings to set x and y.

TurtleToPreview is not positionin and scaling properly when previewing. When the preview is linked to TurtleToPreview, the "tools" (like "Rotate") do not work, even if donatello is paused. Help needed here.

[i-make-robots]

I'm pretty sure this should be setting Makelangelo->setTurtle, which will set the preview panel and allow the other tools (like scale and flip) to work.

[Jackymancs4]

Did you mean MainFrame->setTurtle? Rotation and scaling do indeed works now. Flipping do not. Also do you have ideas for why it appears rotated end flipped by default?