Adding GIFs to readme.

README.md

@@ -85,6 +85,8 @@ func turtleRandomWalk(sim models.Scratch) {
 }
 ```
 
+![Golang Scratch simulation of turtle source random walk](https://github.com/GaryBrownEEngr/scratch/blob/main/examples/randomwalk/randomwalk.gif)
+
 ### Double Pendulum
 
 Here is a simulation of a double pendulum.
@@ -93,16 +95,28 @@ Here is a simulation of a double pendulum.
 go run github.com/GaryBrownEEngr/scratch/examples/DoublePendulum@latest
 ```
 
-![Example Picture](https://github.com/GaryBrownEEngr/scratch/blob/main/examples/DoublePendulum/DoublePendulum.gif)
+![Golang Scratch simulation of a double pendulum](https://github.com/GaryBrownEEngr/scratch/blob/main/examples/DoublePendulum/DoublePendulum.gif)
 
 ### Falling Turtles
 
-Here is a really simple game where you have to click on each turtle before it reaches the bottom of the screen. At the end, your final score is displayed.
+This example is a really simple game where you have to click on each turtle before it reaches the bottom of the screen. At the end, your final score is displayed.
 
 ```bash
 go run github.com/GaryBrownEEngr/scratch/examples/fallingturtles@latest
 ```
 
+### Tumbler
+
+Here is a simulation of a rotating box filled with circles, boxes, and rounded rectangles. This uses the library github.com/jakecoffman/cp for the physics simulation. The sprites are being drawn using Golang Scratch.
+
+This is a recreation of https://jakecoffman.com/cp-ebiten/tumble/ except without drawing the shapes using ebiten and cp directly. Here, cp is only performing the physics updates. The original code can be found [here](https://github.com/jakecoffman/cp-examples/blob/master/tumble/tumble.go)
+
+```bash
+go run github.com/GaryBrownEEngr/scratch/examples/tumbler@latest
+```
+
+![Golang Scratch simulation of a rotating box filled with circles, boxes, and rounded rectangles](https://github.com/GaryBrownEEngr/scratch/blob/main/examples/tumbler/tumbler.gif)
+
 ## Build Executable
 
 To get the list of go build targets use the following command:

examples/randomwalk/main.go

@@ -17,6 +17,9 @@ func main() {
 
 func simStartFunc(sim models.Scratch) {
 	sim.AddCostume(sprite.DecodeCodedSprite(sprite.TurtleImage), "t")
+
+	// go scratch.CreateGif(sim, time.Millisecond*100, time.Millisecond*100, "./examples/randomwalk/randomwalk.gif", 100)
+
 	for {
 		go turtleRandomWalk(sim)
 		time.Sleep(time.Millisecond * 500)

examples/tumbler/main.go

@@ -17,7 +17,7 @@ import (
 
 // https://github.com/jakecoffman/cp-ebiten/tree/gh-pages
 func main() {
-	params := scratch.ScratchParams{Width: 1000, Height: 1000, ShowFPS: true}
+	params := scratch.ScratchParams{Width: 600, Height: 600, ShowFPS: true}
 	scratch.Start(params, simStartFunc)
 }
 
@@ -65,6 +65,8 @@ func simStartFunc(sim models.Scratch) {
 		}
 	}
 
+	// go scratch.CreateGif(sim, time.Millisecond*100, time.Millisecond*100, "./examples/tumbler/tumbler.gif", 100)
+
 	// Run the processing loop forever.
 	for {
 		time.Sleep(time.Millisecond * 10)