# Lecture Animated - University Of Wisconsin-Madison

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9/14/10 UNIVERSITY of WISCONSIN-MADISON Computer Sciences Department CS 202 Introduction to Computation " Professor Andrea Arpaci-Dusseau Fall 2010 Lecture 4: How can computation create animated stories? Flowcharts Flowchart: Visual representation of steps of algorithm Summarizes how algorithm behaves given specific answers Symbols Boxes: Represent states (or actions or actions) Arrows (or edges): Show transitions (or decisions) between states Flowchart Example Flowchart for Animated Story Animated Story: Behaves the same every time No decisions! Flowchart is summary of sequential action of story How to create flowchart? Identify Initial State or Scene Group individual actions into higher-level “scenes” – Somewhat subjective (no right answer) – Label with descriptive name Identify characters of story – Specify actions of each character in scene Connect scenes sequentially 1

9/14/10 Animated Story Flowchart of Animated Story *Initial state* See Scratch code posted on web site! Flowchart of Animated Story *Initial state* Background: Railroad Cat: Left side Dog: Right side Flowchart of Animated Story *Initial state* Background: Railroad Cat: Left side Dog: Right side *Introductions* Cat: What should we do? Dog says: I don't know 2

9/14/10 Flowchart of Animated Story *Initial state* Background: Railroad Cat: Left side Dog: Right side *Introductions* Cat: What should we do? Dog says: I don't know *Color* Cat says: Lets do Tricks! Cat: I can change colors! Cat changes to 5 colors Cat changes back Flowchart of Animated Story *Initial state* Background: Railroad Cat: Left side Dog: Right side *Introductions* Cat: What should we do? Dog says: I don't know *Color* Cat says: Lets do Tricks! Cat: I can change colors! Cat changes to 5 colors Cat changes back *Whirl* Cat says I can whirl Cat whirls 5 times Cat changes back Flowchart of Animated Story *Initial state* Background: Railroad Cat: Left side Dog: Right side *Whirl* Cat says I can whirl Cat whirls 5 times Cat changes back *Introductions* Cat: What should we do? Dog says: I don't know *Fly* Cat moves 5 times Cat goes back *Color* Cat says: Lets do Tricks! Cat: I can change colors! Cat changes to 5 colors Cat changes back Flowchart of Animated Story *Initial state* Background: Railroad Cat: Left side Dog: Right side *Whirl* Cat says I can whirl Cat whirls 5 times Cat changes back *Introductions* Cat: What should we do? Dog says: I don't know *Fly* Cat moves 5 times Cat goes back *Color* Cat says: Lets do Tricks! Cat: I can change colors! Cat changes to 5 colors Cat changes back *Tiny* Cat becomes tiny Dog says I like that! Cat says why? 3

9/14/10 Flowchart of Animated Story *Initial state* Background: Railroad Cat: Left side Dog: Right side *Whirl* Cat says I can whirl Cat whirls 5 times Cat changes back *Introductions* Cat: What should we do? Dog says: I don't know *Fly* Cat moves 5 times Cat goes back *Color* Cat says: Lets do Tricks! Cat: I can change colors! Cat changes to 5 colors Cat changes back *Tiny* Cat becomes tiny Dog says I like that! Cat says why? *Eat* Dog says: No reason Dog walks until reaches cat Cat meows and disappears Dog says yummy How to Transform Flowchart to Scripts? Flowchart of Animated Story *Initial state* Background: Railroad Cat: Left side Dog: Right side *Whirl* Cat says I can whirl Cat whirls 5 times Cat changes back *Eat* Dog says: No reason Dog walks until reaches cat Cat meows and disappears Dog says yummy *Introductions* Cat: What should we do? Dog says: I don't know *Color* Cat says: Lets do Tricks! Cat: I can change colors! Cat changes to 5 colors Cat changes back *Tiny* *Fly* Cat moves 5 times Cat goes back Cat becomes tiny Dog says I like that! Cat says why? *End* Background and Dog fade out Background shows The End How to Tell Another Script to Run? Approach For each scene in flowchart, specify a script – May need to specify script for each character – Blocks in script show individual actions to be performed How to determine when script can run? – When should “Initial state” run? – When should “Introductions” scene run? – When should “Color” scene run? 4

9/14/10 How to Run Desired Script? Cat Scripts See Scratch code posted on web site! Dog Scripts Stage Scripts 5

9/14/10 Programming Concepts General Divide high-level functionality into logical units Descriptive naming is important Initial state must be specified Incrementally test code as you go Scripts must be activated to run Execution within script proceeds sequentially Control : forever, repeat times , repeat until Parameters (to blocks) specify behavior Goal is to make “non-fragile” code – When flag clicked; When receive message Today’s Summary Today’s Topics How to create animated stories in Scratch How to outline a sequential flowchart of steps How to broadcast and receive messages in Scratch Reading: Scratch User’s Guide Announcements Homework 2 due before class Friday – See web page for hw details (www.cs.wisc.edu/ cs202-1) – Any questions Send mail to cs202-tas@cs.wisc.edu Lab Hours in 1370 CS – Monday, Wednesday: 12-2pm – Tuesday, Thursday: 4-6pm 6

Flowchart Example Flowchart for Animated Story Animated Story: Behaves the same every time No decisions! Flowchart is summary of sequential action of story How to create ﬂowchart? Identify Initial State or Scene Group individual actions into higher-level "scenes" - Somewhat subjective (no right answer)

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