Digital Art in Scratch part 1 Barb Ericson Georgia Tech May 2011

Goals Learn about –Drawing sprites –Using the pen blocks: stamp –Event handling –Loops

Project Description We will draw a simple shape (a plus sign) and use it to make art. –By stamping the shape as we follow the mouse –We will change the costume (color) we draw with when the user presses the space key

Big Picture Delete cat sprite Paint the background for the stage Paint the sprite that you will draw with –the plus sign Copy the costume for the sprite and change the color Program the sprite –To follow the mouse and leave a copy –To change costume when the space key is pressed

Delete cat sprite To delete the cat –Click the scissors –Click the cat Or right click on the cat and select delete

Painting the background Click on the stage icon in the sprites area Select the backgrounds tab –Click Edit

Setting background color Select a color –Using the eye dropper tool Select the fill tool –Bucket Fill the stage with the color

Painting the Sprite Click on star with paintbrush –To paint a sprite Select a color –Use the eye dropper Paint the sprite –Use the line tool

Copy the costume Click on the costume tab –For Sprite1 Click on Copy –To copy the costume Click on Edit

Change the Color Pick a color –Use the eye dropper Change the color –Use the fill tool You may want to grow the sprite first to make it easier to fill it Then shrink it after

Programming Steps When the green flag is clicked do all set-up –Clear the drawing area –Maybe set the starting costume –Then Loop forever Move to the current cursor location Stamp the shape –Draw a copy of it

Set-up When the green flag is clicked –Clear the drawing area

Follow mouse and stamp Forever - Control –Go to the cursor's x and y location - Motion Drag out mouse x and mouse y -Sensing –Stamp a copy of the sprite - Pen

Change Costume When the space key is pressed- Control –Switch to next costume - Looks

Challenges When the green flag is clicked –Set the starting position and costume Add other costumes with other colors Add a way to clear the drawing –Press a key or add a button sprite Try drawing with other shapes Add a turn

Concept Summary Backgrounds –Can be painted Sprites –Can be painted and copied and then edited Forever loops –repeat all the commands inside of them one at a time until the script is stopped or all scripts are stopped Events –Respond to something like the green flag being clicked or the space key being pressed