218 lines
5.6 KiB
Markdown
218 lines
5.6 KiB
Markdown
# Karel the LED
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## ~avatar avatar
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Help Karel make LED art!
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## ~
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**Karel the LED** can't turn right, but he can make some great LED art!
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The goal of this activity is to download the JavaScript code given below onto a @boardname@.
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Then use the program to introduce new students to the @boardname@.
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Students will not do the coding this time. They will be the users who get familiar with the board.
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## How to play
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* ``A button`` **Turn Left**
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>Does not draw anything just changes the direction Karel (the flashing led) is facing
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* ``B button`` **Move Forward**
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>Moves Karel forward one step and leaves the LED on behind him
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* ``shake`` **Jump**
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>Moves Karel forward one step without leaving the LED on behind him
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* ``A+B button`` **Hide Karel**
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>Shows or hides Karel (the flashing LED), to be used once your artwork is complete
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* ``Reset button`` **Clear the board and restart**
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>Restart the program and clear the board
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**Note:** There is no way to erase, except by restarting.
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## Try drawing some patterns
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See if you can make each pattern below using **A**, **B**, and **shake**. Once you have completed a challenge press **A** and **B** at the same time to hide Karel.
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For patterns that you design, decide which LEDs you want to turn on and then make that design with Karel.
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### Spiral
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### Right turn
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### Eyes
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### Smile
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### Check
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### First letter of your name
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Figure out how to make the first letter of your name with the LEDs.
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```sim
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basic.forever(() => {
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basic.showAnimation(`
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# # # . . # # # . . # # # . . # # # . .
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. . . . . # . . . . # . . . . # . . # .
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. . . . . # . . . . # . . . . # . . # .
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. . . . . # . . . . # . . . . # . . # .
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. . . . . # . . . . # # # . . # # # . .
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`)
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basic.pause(1000)
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basic.clearScreen()
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basic.pause(1000)
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})
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```
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### Your design!
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Make something fun!
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```sim
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basic.forever(() => {
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basic.showAnimation(`
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# . . . . # . . . . # . . . . # . . . . # . . . . # . . . .
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. . . . . # . . . . # . . . . # . . . . # . . . # # . # # #
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. . . . . # . . . . # . . . . # . . . . # . . . # # . # . #
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. . . . . # . . . . # . . . . # . . . . # . . . # # . . . #
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. . . . . # . . . . # # # # # # # # # # # # # # # # # # # #
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`)
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basic.pause(1000)
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basic.clearScreen()
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basic.pause(1000)
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})
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```
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Thanks for playing with Karel the LED!
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## Coding Karel the LED
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Copy this code into the JavaScript editor and then download it to the board.
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**Note:** For this project you need to manually copy the code and insert it into the JavaScript view of the editor.
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```typescript
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class Board {
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public isKarelActive: boolean;
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public karelX: number;
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public karelY: number;
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public ledState: Image;
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private karelDirection: Direction;
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constructor() {
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this.isKarelActive = true;
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this.karelX = 2;
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this.karelY = 2;
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this.karelDirection = Direction.UP;
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this.ledState = images.createImage(`
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. . . . .
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. . . . .
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. . . . .
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. . . . .
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. . . . .
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`);
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}
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pressedA() {
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if (!this.isKarelActive) {
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return;
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}
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this.karelDirection = (this.karelDirection + 1) % 4;
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}
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pressedB() {
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if (!this.isKarelActive) {
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return;
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}
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this.ledState.setPixel(this.karelX, this.karelY, true);
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this.moveKarel()
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}
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shake() {
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if (!this.isKarelActive) {
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return;
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}
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this.moveKarel()
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}
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private moveKarel() {
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if (!this.isKarelActive) {
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return;
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}
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switch (this.karelDirection) {
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case Direction.UP:
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if (this.karelY > 0) {
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this.karelY -= 1;
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}
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break;
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case Direction.LEFT:
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if (this.karelX > 0) {
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this.karelX -= 1;
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}
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break;
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case Direction.DOWN:
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if (this.karelY < 4) {
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this.karelY += 1;
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}
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break;
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case Direction.RIGHT:
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if (this.karelX < 4) {
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this.karelX += 1;
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}
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break;
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}
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}
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pressedAB() {
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this.isKarelActive = !this.isKarelActive;
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}
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update() {
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this.ledState.showImage(0);
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}
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}
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const board = new Board();
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enum Direction {
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UP = 0,
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LEFT,
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DOWN,
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RIGHT
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}
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input.onButtonPressed(Button.B, function () {
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board.pressedB();
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board.update();
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})
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input.onGesture(Gesture.Shake, function () {
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board.shake();
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board.update();
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})
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input.onButtonPressed(Button.A, function () {
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board.pressedA();
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board.update();
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})
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input.onButtonPressed(Button.AB, function () {
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board.pressedAB();
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board.update();
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})
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basic.forever(function () {
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if (board.isKarelActive) {
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led.toggle(board.karelX, board.karelY)
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basic.pause(500)
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}
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})
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```
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## About the authors
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This project\*\* was contributed by Dr. David Fisher a professor at [Rose-Hulman Institute of Technology](https://www.rose-hulman.edu/academics/faculty/fisher-david-fisherds.html). Dr. Fisher loves educational robotics and runs various outreach programming activities, including a summer camp, called [Connecting with Code](https://connectingwithcode.org), which gives a @boardname@ to each participant.
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\*\* Upgraded to **v1** by the MakeCode team.
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