Grid, Guide Lines, Tracing and Reference
This feature contains a list of assistance tools.
- Grid
Display grids on the top of the canvas.
- Guide Lines
Drawing some guide lines on the top of the canvas, but these lines are not the real part of the artwork.
- Tracing
Drawing the trace of a image.
- Reference
Open a image as reference while drawing.
Grid
Grid is a useful assistant tool for drawing, you can also custom the size, color and line width. It will be displayed on the top of the artwork and below the Guide Lines.
The Grid can be show when you tap 
button.
- Line Color
The color of the horizontal and vertical lines.
- Size
The width between 2 vertical lines, and the height between 2 horizontal lines.
- Line width
The width of the lines.
Guide Lines
Guide Lines is another kind of assistant tool for drawing, it likes to make marks on artwork, you can draw some lines or dot to help you while drawing.
The Guide Lines will be displayed at the very top of the artwork.
The Guide Lines can be show when you tap button.
You need to enable drawing guide lines manually by tap 
button.
Undraw last guide line.
Redraw last guide line.
Clean all guide lines.
Tracing
Tracing is a assistant tool of copying the image. Sometimes, you may want to drawing something like an existing image, you can just use this tool.
Tracing is not same as the Import Image to artwork, the image of tracing is not part of the artwork, it only insert an image temporary under the artwork, once the drawing is finished, it can be removed.
The image of tracing can be managed in following ways:
Select an image:
- From Files
- From Photo Library
- From Camera(take a new photo)
Edit the image with Image Editor.
Crop the artwork with current image of tracing.
Lock current image of tracing, the image will not allowed to changed.
Remove current image of tracing.
Once the image is set, you can align it related on the artwork:
Align left.
Align right.
Align top.
Align center.
Align bottom.
You can also change the rotation and fill method of image:
Scale to full fill the artwork, the ratio of image will be changed to same one as the artwork .
Scale to fit the artwork, this will keep the original ratio of image.
Rotate left 90 degree.
Rotate right 90 degree.
Reset the image to original and located at the center of artwork.
The most important thing is the Focus Visibility, please check this from Settings. It used to control the alpha value of multiple layers. If this value is tool high, the image of tracing should be covered.
Reference
The Reference is like Tracing, it also needs an image. But the Reference is more easier, it just to pin the image at the top of artwork as reference.
The Reference can be zoomed and moved by 2 fingers pinches.
Both the Tracing and Reference can be show when you tap button.
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