Main Screen

This is the main BobSprings screen as seen when you first install the application.

You can touch and drag the head to see the spring function in action.

In general, we use the term head and Bobbler interchangeably to mean the image that is attached to the spring(s).

Double-tapping or tapping the information icon let's you configure the application as explained below.

Initial Configuration Screen

This is the main configuration screen.

Shake - enables/disables actuating the Bobbler by shaking your device.

Bobbler Graphics - two table cells that let you configure the look of your BobSprings.

Bobbler - shows the current image attached to the spring(s). Tapping this cell initiates Bobbler placement and selection.

Background - shows the current image used as the background for the Bobbler. Tapping this cell initiates Background selection.

Spring Model - this cell shows the current model selected and its name. Tapping initiates Spring Model configuration.

Bobbler Configuration - Positioning

This screen allows you to position the vertical position of your Bobbler image. Depending on the spring model settings (see below), specifically the Spring coefficient (stiffness), the image position in the main screen may be slightly lower due to gravity.

The New button allows you to select a new image for the head/Bobbler, as described below.

Bobbler Configuration - Image Selection

When you select the New button in the image above, you are taken to your iPhone/iPod touch photo albums where you can select an image to work with.

As soon as an image is selected, you will see the timed (3 seconds) dialogue shown here.

Pinching and dragging outside the red oval (selection oval) lets you resize and move the image, respectively.

Pinching and dragging inside the oval lets you resize and move the selection, respectively.

When you have sized and positioned the image and selection oval, double-tapping will bring up the Bobbler Edit menu.

Tapping Done will bring up a save dialogue.

Cancel - returns you to editing mode for the image you selected.

Discard this image... - returns you to the main configuration screen.

Save - saves the image selection as your new Bobbler, and returns you to the Bobbler Edit screen where you can position your new Bobbler.

Go ahead and set the vertical position of your new Bobbler.

Background

Changing the background image is much the same process as changing the head or Bobbler image. The main difference is that you are selecting the entire image and not just a region of it.

Tapping the Background cell in the main configuration screen takes you to the Background Edit screen. Tapping New takes youto your iPhone/iPod touch photo albums where you can select an image to work with.

As soon as an image is selected, you will see the timed (3 seconds) dialogue shown here.

Size and position the background image as you like, then double-tap to bring back the menu.

The save dialog is the same as the one described above.

After saving your new Background and navigating back through the main configuration screen to the main screen, you'll have your new BobSprings.

Model Settings

The Spring Model settings allow you to vary the spring stiffness coefficient, the damping coefficient, and the spring configuration.

The spring dynamics are governed by Hooke's Law, which in non-vector notation is F = -k x. 'k' is the stiffness coefficient that determines the amount of proportional force, F, exerted by the spring. Dragging the slider right increases the stiffness.

The damping coefficient governs the rate at which the initial energy imparted to the system (by dragging the Bobbler or shaking) is dissipated. Dragging the slider right increases the damping.

The picker allows you to select spring configurations. We plan to add several more in future releases.