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Sketchlet Tutorial Variables

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Learn how to use variables in Sketchlet to exchange messages, manipulate data, and trigger actions. Understand the scope, interface, and examples of working with variables.

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Sketchlet Tutorial Variables

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  1. Sketchlet TutorialVariables sketchet.sf.net Željko Obrenović obren.info/

  2. Agenda • Variables • Using variables

  3. Variables • Many elements of Sketchlet communicate indirectly by exchanging messages through a centralized repository of variables. • Variables can have two scopes: page or global • Variables provide a simple and uniform abstraction mechanism, enabling a designer to work with very diverse elements using the same set of operations. • Properties of freehand sketches, such as their position or transparency, or user actions such as item selections, can be mapped to blackboard variables.

  4. Variables • Spreadsheets or scripts can subsequently read, process, and update these variables. • I/O services can receive arguments and send back results through such variables. • Lastly, through extension mechanisms other platforms can update, read or register for the notification of variables.

  5. Interface for Working with Variables System event variables Delete selected variables • Variables can be accessed through a spreadsheet-like interface, making all data immediately visible and manipulatable. • A designer can directly observe and update variables. Derived variables Disable variables’ updates Add new variable Dynamic variables Filter

  6. Examples of Using Variables • Capturing user motion • Setting region and sketch properties • Updating variables based on events • Actions triggered by variable updates

  7. Capturing User Motion in Variables • Step 1: Creating variable “rot”

  8. Capturing User Motion in Variables • Step 2: drag-and-drop the variable on the active region motion mapping icon

  9. Capturing User Motion in Variables • Step 3: select properties of motion that you want to capture in the variable • In this exampleit is “rotation”

  10. Capturing User Motion in Variables • Step 4: interact with the region and observe variables changes • In this example, dragging the region with right mouse button will rotate it and update the variable “rot”

  11. Setting Region and Sketch Properties • You can drag-and-drop the variable on the region properties icon, and select property

  12. Setting Region and Sketch Properties • In this example we are using variable “rot” to control rotation property of another region

  13. Updating Variables on Events • Events • Mouse Events • Keyboard Events • Sketch events: entry, exit • Variable Actions • Update variable • Increment variable • Append variable

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