What is Doodleback?

A lot of drawing apps let you construct a circle but usually in only one way. They let you copy an object but in only one way or erase but in only one way. But what if you wanted to erase with a star or copy something by rotation? Doodleback’s philosophy is that how you’re able to construct things is almost as important as what you can construct. Being able to precisely place objects at the moment of their creation simplifies many drawings that would otherwise be difficult or almost impossible. You can get it here on Google Play.

Dual Elliptical Ring

The Dual Elliptical Ring tool is similar to the Elliptical Ring tool except that the inner and outer ellipses do not have to be the same shape. Here’s an example. The first ellipse (which can be either the inner ellipse or the outer ellipse) is defined in exactly the same way as the initial ellipse in an Elliptical Ring. You define the bounding rectangle of the ellipse using one of these construction methods: Select the center first and then one of the corners of the bounding rectangle Select the opposite corners of the bounding rectangle Select one of the corners of the bounding rectangle and then the center Select the horizontal axis of the ellipse and then one of the corners of its bounding rectangle Select the vertical axis of the ellipse and then one of the corners of the bounding rectangle Select the center of the ellipse, the end of its horizontal axis (using the mark button), and then one of the corners of the bounding rectangle Select the center of the ellipse, the end of its vertical axis (mark button), and then one of the corners of the bounding rectangle [Read More]
curves 

Ellipse

The Ellipse tool lets you to construct an ellipse in several different ways. The first Option Button determines the construction method: Select the center first and then one of the corners of the bounding rectangle Select the opposite corners of the bounding rectangle Select one of the corners of the bounding rectangle and then the center Select the horizontal axis of the ellipse and then one of the corners of its bounding rectangle Select the vertical axis of the ellipse and then one of the corners of the bounding rectangle Select the center of the ellipse, the end of its horizontal axis (using the mark button), and then one of the corners of the bounding rectangle Select the center of the ellipse, the end of its vertical axis (mark button), and then one of the corners of the bounding rectangle [Read More]
curves 

Ellipse Arc

The Ellipse Arc tool allows you to create these types of shapes: You first need to define the bounding rectangle on which the ellipse will be based. For that you used the second Option Button: Select the center first and then one of the corners of the bounding rectangle Select the opposite corners of the bounding rectangle Select one of the corners of the bounding rectangle and then the center Select the horizontal axis of the ellipse and then one of the corners of its bounding rectangle Select the vertical axis of the ellipse and then one of the corners of the bounding rectangle Select the center of the ellipse, the end of its horizontal axis (using the mark button), and then one of the corners of the bounding rectangle Select the center of the ellipse, the end of its vertical axis (mark button), and then one of the corners of the bounding rectangle After you’ve defined the ellipse, you then need to define the “sweep” of the arc, that is, the start angle and the end angle. [Read More]
curves 

Elliptical Ring

The Elliptical Ring tool is similar to the Ellipse tool except that instead of an ellipse, it creates an ellipse with an elliptical hole in the middle. This means that you have to define not only the bounding rectangle of the ellipse but also the inner (or outer) radius of the ring. The construction methods for the initial ellipse are identical to those of an Ellipse: Select the center first and then one of the corners of the bounding rectangle Select the opposite corners of the bounding rectangle Select one of the corners of the bounding rectangle and then the center Select the horizontal axis of the ellipse and then one of the corners of its bounding rectangle Select the vertical axis of the ellipse and then one of the corners of the bounding rectangle Select the center of the ellipse, the end of its horizontal axis (using the mark button), and then one of the corners of the bounding rectangle Select the center of the ellipse, the end of its vertical axis (mark button), and then one of the corners of the bounding rectangle [Read More]
curves 

Leaf

The Leaf tool can be used to produce a simple leaf shape, but it can also be used to construct many other interesting shapes. Like the Petal tool, it’s basically two line segments that both share the same endpoints but are stretched out by their Bezier points so that they don’t overlap exactly and look like one segment. On construction you can use the Bezier point option button which looks like this: [Read More]
curves 

Parabola

The Parabola tool allows you to create either an open or closed parabola in a few different ways. In an open parabola, the end points of the parabola are joined and the interior of the parabola is filled. For a closed parabola, the endpoints of the parabola are not connected and the interior is not filled. The second Option Button offers these construction methods: Vertical open Vertical closed Horizontal open Horizontal closed [Read More]
curves 

Petal

The Petal tool lets you create flower petal shapes. Like the Leaf tool, it’s basically two line segments that both share the same endpoints but are stretched out by their Bezier points so that they don’t overlap exactly and look like one segment. After construction, you can use the Move Vertex and Move Bezier Point tools on it to adjust its shape if you want. During construction, the mark button is used to define the axis of the Petal. [Read More]
curves 

Convert Erase Path (Erase All or Erase None)

The two tools Convert to Erase ALL Existing Paths and Convert to Erase NO Existing Paths both operate on an Erase Path (a path where at least one of the paint layers is erasing) and alter its erasing behavior. If the option Erasure Honors Creation Time is turned on, an Erase Path can only cut through those paths that are both below it (see Z Levels) and were created before the erase path was created. [Read More]

Delete Path

The Delete tool deletes a path when you touch one of its Snapping Points. This is not the same as erasing. The path, the entire path, simply disappears. Don’t think of this as an eraser in other drawing apps that lets you scrub out a piece of the image. See also the Delete Collection tool which allows you to delete several paths at once. If you do want to erase, see Erasing. [Read More]

Delete Path Collection

The Delete Collection tool is used to delete a group of paths simultaneously or to delete a hard to select bottom or top path in a selected area. You select a group using either a rectangular or a circular enclosing area. The only other “construction” (destruction?) option is the type of paths to delete. Delete: All Delete: Points Delete: Guide Lines Delete: Free Draws Delete: Line Segments Delete: Bottom Path Delete: Top Path [Read More]