We put together a list of frequently asked questions to help you get started with using Catchbook. If you have a question that you don't see here, just create a new post in the forum to ask.
We'll be updating this list as we go, so refer back to it as needed.
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How do I create curves?
When you first start Catchbook you will be drawing ink.
To convert your ink to curves as you draw, tap the triangular button in the middle of the page Toolbar
When it is orange, all the ink you draw will be turned into curves you can edit
How do I turn on Active Stylus?
Some devices can tell whether it is a stylus or a finger touching the screen. If you have such a device then you should turn on "Active Stylus" mode to get the best user experience.
e.g. Samsung Galaxy Note, Surface Pro, iPad Pro, etc.
Current versions have active stylus mode turned off by default.
To turn on active stylus mode tap more "…" on the page toolbar, then tap the grey pen button:
The pen button is now orange and you can pan the page with a single finger drag. Use your stylus to draw!
Note: When the active stylus mode is OFF you'll need to use 2 fingers to pan the page
How do I delete curves?
Tap a curve to select it, then hit the trash icon that appears near the curve
Or for more control…
Scribble over the curve with a back and forward motion (note this will not work for the marker pen)
Make sure your scribble goes back and forth at least 4 times
How do I trim curves?
The scribble described above also lets you trim curves
Just scribble close to the intersection and Catchbook will do the rest
Scribble can also be used to divided a single curve into 2 separate curves
How do I edit objects with touch?
Simply tap an object to edit it
Dragging a selected object will move it around the page
2 Finger rotate will rotate the object
2 Finger pinch will scale the curve - note, you have to do quite a big pinch to get this to work for curves
How do I edit curves?
Simply tap the curve
You can edit it using the normal gestures on the curve itself
You can also drag the handles of the curve for more refined control
How do the rotate and scale handles work?
Tap the objects you want to edit
On a tablet, tap the more "…" (this is not required on a phone)
Tap the rotate or scale button
The large handle is used to control the extent of the rotation/scale
The small handle lets you control the centre of rotation/scale
Note: the centre handle will snap to other objects (including circle centres!)
How do I make 2 lines parallel?
Select one line, drag one end handle so it over the other line so it highlights, move away
The line you are editing should now snap to parallel with the other
You can use this trick for other constraint types as well…
How do I change the pen colour/width/opacity?
Tap the pen icon on the main menu
The settings button will edit your currently active pen
Use the setting menu to change all the pen characteristics
How do I edit the colour/width/opacity of curves and ink that have already been drawn?
Select the curves/ink
Tap the more "…"
Tap the settings button
Change the settings
Hint, you can draw in the white space in the settings UI to see what the objects will look like
How do I change the curve font?
Select the curves
Tap the more "…"
Choose the line icon, several curve font options will appear in the drop down list
How do I mirror curves?
Select a single line
Tap the more "…"
Tap the reflection line button
The reflect line will turn purple
Now select the curves you want to reflect
Tap the more "…"
Tap the reflect button
Mirrored copies will be created
To turn off the purple reflection line tap it again, then hit more "…" and then tap the reflect off button
Can I group objects?
Yes - any combination of objects can be grouped
Select the objects
Tap the more "…"
Choose the group icon
Now when you tap any group member all the members of the group will be selected
If you want to select an individual group member on its own, tap it twice
Ungroup using the same button as group
How do I create a dimension?
Turn on Dimensioning in the page UI.
Tap more “…” and tap the ruler.
When this is on, every curve you touch will show preview dimensions. Simply tap the preview to create the dimension.
If you select 2 curves it will create a dimension between them, again, tap it to persist
If you select 3 or more curves, no dimension preview is shown
Tap dimensions and drag to edit their position
How do I set the scale of my page?
When you only have one dimension on a page, editing its value will set the scale. (Double tap a dimension to edit)
When you have 2 or more dimensions on a page, editing the value will update the curves. The trick is to set the first dimension to a value that suits what you are drawing.
How do I edit a dimension?
Double tap the dimension text to edit the dimension value
Catchbook will update the geometry to match the value you enter
Note: Catchbook dimensions are not honoured, subsequent edits will change the dimension value. We are investigating implementing locked dimensions.
How do I control the direction of a linear dimension edit?
To specify the direction of a dimension edit, double tap the dimension arrow you want to absorb the edit, the other end will remain stationary.
How do I add an image/photo?
Press hold on an empty part of the page or Tap more "…" on the toolbar
Tap the image or photo button
For photo you will see your normal camera app, for image you can navigate to choose the image
When it is on the page you can move the image with one finger drag
You can resize and rotate with a 2 finger drag
You can also pin an image to the page
How do I pin an image to the page?
If you want to draw over an image, you should put it into trace mode to pin it to the page
Tap the image and hit the more "…" icon
Hit the trace mode icon
You can now draw over the image without having to worry about re-sizing or moving it
You'll also notice it has become transparent to make the curves you draw over it easier to see
How do I export a page?
Press-hold on and empty part of the page
Tap the share button on the pop-up menu
On Android you will see UI that lets you share to another app.
On Windows you will see a "Save As" dialog, choose the file type as normal.
Available file types for Catchbook pages: .cb (Catchbook format), .png, .pdf, .dxf, .svg
Note: .dxf and .svg will only export the curves you have on the page (not ink)
Note: you can also export a page via the navigator by dragging it to the share icon
How do I export an entire Catchbook Binder?
Go to the navigator
Press-hold, then drag a Catchbook Binder - you will see a share target appear
Drop the page on the share target
On Android you will see UI that lets you share to another app
On Windows you will see a "Save As" dialog, choose the file type as normal
Available file types Catchbook Binders: .cb (Catchbook format), .pdf
How to Change a Line to an Arc
Double tap the line
Select the mid point and drag
How to Change an Arc to a Line
Double tap the arc
Select the mid point of arc and drag until it snaps horizontal or vertical