# Making a Terraria like game, need help with an error **URL:** \ **Category:** Help\ **Tags:** javascript\ **Created:** [April 18, 2023, 11:32pm UTC](https://forum.makecode.com/t/making-a-terraria-like-game-need-help-with-an-error/19275 "2023-04-18T23:32:59Z")\ **Posts on this page:** 18\ **Page:** 1
**Author:** ![Samsano](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/samsano/32/8307_2.png) [@Samsano](https://forum.makecode.com/u/Samsano)\ **Post date:** [April 18, 2023, 11:32pm UTC](https://forum.makecode.com/t/making-a-terraria-like-game-need-help-with-an-error/19275/1 "2023-04-18T23:32:59Z")
The code is stolen borrowed from @yoxd707. I put all the files into one file and now i get this error: can’t read properties of null (reading ‘fields’). I know it is because it tries to read something that doesen’t exist but my puny brain can’t handle JavaScript yet, let alone TypeScript. Here is the code: > **[Terraria like Game](https://arcade.makecode.com/S11006-42062-17640-45579)** > > Made with ❤️ in Microsoft MakeCode Arcade. in: terrainGeneration.ts ---
**Author:** ![labfox29](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/labfox29/32/9252_2.png) [@labfox29](https://forum.makecode.com/u/labfox29)\ **Post date:** [April 19, 2023, 9:44pm UTC](https://forum.makecode.com/t/making-a-terraria-like-game-need-help-with-an-error/19275/2 "2023-04-19T21:44:23Z")
I dont see no code ---
**Author:** ![yoxd707](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/yoxd707/32/8506_2.png) [@yoxd707](https://forum.makecode.com/u/yoxd707)\ **Post date:** [April 19, 2023, 10:03pm UTC](https://forum.makecode.com/t/making-a-terraria-like-game-need-help-with-an-error/19275/3 "2023-04-19T22:03:53Z")
And you had no better idea than to steal borrow an older version that had a worse performance, since it used sprites instead of tiles 🤣 Later I will check what you did and maybe I can help you with the error… ---
**Author:** ![yoxd707](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/yoxd707/32/8506_2.png) [@yoxd707](https://forum.makecode.com/u/yoxd707)\ **Post date:** [April 19, 2023, 10:03pm UTC](https://forum.makecode.com/t/making-a-terraria-like-game-need-help-with-an-error/19275/4 "2023-04-19T22:03:55Z")
The file you made is fine but you missed calling the main function, you should do it before the game.onUpdateInterval and game.onUpdate events. ![imagen](https://us1.discourse-cdn.com/flex020/uploads/makecode/original/2X/4/48fd885c9cda85151e5b2193dcf2ab1d6085080f.png) But the error actually comes from you didn’t create the grass, dirt and stone images in assets, they should be 8x8 px. I tried to do it on a clone of your project but there seems to be a bug and it doesn’t work. So I recommend you to make a new one, first create the images in the asset and then add the file with the programming. Good luck, keep me posted if any other issues arise 😄 ---
**Author:** ![pigpigeons\_r\_c00l](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/pigpigeons_r_c00l/32/12313_2.png) [@pigpigeons\_r\_c00l](https://forum.makecode.com/u/pigpigeons_r_c00l)\ **Post date:** [April 20, 2023, 9:27pm UTC](https://forum.makecode.com/t/making-a-terraria-like-game-need-help-with-an-error/19275/5 "2023-04-20T21:27:08Z")
neither do i ---
**Author:** ![Samsano](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/samsano/32/8307_2.png) [@Samsano](https://forum.makecode.com/u/Samsano)\ **Post date:** [April 20, 2023, 10:01pm UTC](https://forum.makecode.com/t/making-a-terraria-like-game-need-help-with-an-error/19275/6 "2023-04-20T22:01:56Z")
Yea, i noticed that i used wrong when i edited your one to make a sprite with gravity and it phased through the ground… Have been trying your newer codes. And i am geniuenly impressed you can make procedural generation, in which i do not understand anytyhing 😅 ---
**Author:** ![yoxd707](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/yoxd707/32/8506_2.png) [@yoxd707](https://forum.makecode.com/u/yoxd707)\ **Post date:** [April 21, 2023, 4:38am UTC](https://forum.makecode.com/t/making-a-terraria-like-game-need-help-with-an-error/19275/7 "2023-04-21T04:38:00Z")
I’m going to try to make it more “accessible”, although I have so much work that it can take time 😵‍💫 But it would be a good hobby to try to improve the project. Try using something newer, though it will be much more difficult to understand 😅 ---
**Author:** ![Samsano](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/samsano/32/8307_2.png) [@Samsano](https://forum.makecode.com/u/Samsano)\ **Post date:** [April 21, 2023, 4:43pm UTC](https://forum.makecode.com/t/making-a-terraria-like-game-need-help-with-an-error/19275/8 "2023-04-21T16:43:04Z")
I said in the post you have to go to terrrainGeneration.ts. ---
**Author:** ![Samsano](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/samsano/32/8307_2.png) [@Samsano](https://forum.makecode.com/u/Samsano)\ **Post date:** [April 21, 2023, 4:43pm UTC](https://forum.makecode.com/t/making-a-terraria-like-game-need-help-with-an-error/19275/9 "2023-04-21T16:43:09Z")
Would it be possible if you made it an extension? Just a suggestion and then people like, wanting to use Noise for games, could use it in blocks ---
**Author:** ![yoxd707](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/yoxd707/32/8506_2.png) [@yoxd707](https://forum.makecode.com/u/yoxd707)\ **Post date:** [April 21, 2023, 5:37pm UTC](https://forum.makecode.com/t/making-a-terraria-like-game-need-help-with-an-error/19275/10 "2023-04-21T17:37:48Z")
Yesterday I made an extension so that perlin noise can be used, the idea would be to make another one for the generation of 2d terrains 🙃 > **[GitHub - yoxd707/pxt-perlin-noise: Extension to generate perlin noise in...](https://github.com/yoxd707/pxt-perlin-noise)** > > Extension to generate perlin noise in arcade makecode - GitHub - yoxd707/pxt-perlin-noise: Extension to generate perlin noise in arcade makecode ---
**Author:** ![YuHayate](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/yuhayate/32/8275_2.png) [@YuHayate](https://forum.makecode.com/u/YuHayate)\ **Post date:** [April 21, 2023, 5:50pm UTC](https://forum.makecode.com/t/making-a-terraria-like-game-need-help-with-an-error/19275/11 "2023-04-21T17:50:54Z")
How it work? ---
**Author:** ![yoxd707](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/yoxd707/32/8506_2.png) [@yoxd707](https://forum.makecode.com/u/yoxd707)\ **Post date:** [April 21, 2023, 7:10pm UTC](https://forum.makecode.com/t/making-a-terraria-like-game-need-help-with-an-error/19275/12 "2023-04-21T19:10:02Z")
The extension adds 5 functions, one in the Math section that would be the [lerp](https://en.wikipedia.org/wiki/Linear_interpolation) function. And another 4 functions in the Perlin Noise section, two functions for noise, 1D and 2D. And two functions for the Perlin Noise ([FBM](https://en.wikipedia.org/wiki/Fractional_Brownian_motion)), 1D and 2D. More documentation about it… [Simplex Noise](https://en.wikipedia.org/wiki/Simplex_noise) [Perlin Noise](https://web.archive.org/web/20160530124230/http://freespace.virgin.net/hugo.elias/models/m_perlin.htm) > **[Sebastian Lague](https://www.youtube.com/@SebastianLague)** > > Hello, on this channel I explore how to create stuff out of code. I hope you find some of it interesting! [He has videos explaining the subject](https://www.youtube.com/watch?v=wbpMiKiSKm8) ---
**Author:** ![Samsano](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/samsano/32/8307_2.png) [@Samsano](https://forum.makecode.com/u/Samsano)\ **Post date:** [April 24, 2023, 1:51pm UTC](https://forum.makecode.com/t/making-a-terraria-like-game-need-help-with-an-error/19275/13 "2023-04-24T13:51:55Z")
I have two questions: 1. How would i place tiles on the noiseMap 2. What does this parameter do? ![image](https://us1.discourse-cdn.com/flex020/uploads/makecode/original/2X/f/fe5da3fed0ddf81e6e17d1d65269f6081391ea4b.png) ---
**Author:** ![YuHayate](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/yuhayate/32/8275_2.png) [@YuHayate](https://forum.makecode.com/u/YuHayate)\ **Post date:** [April 24, 2023, 8:06pm UTC](https://forum.makecode.com/t/making-a-terraria-like-game-need-help-with-an-error/19275/14 "2023-04-24T20:06:26Z")
Do you have a explanation on how to use them? ---
**Author:** ![yoxd707](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/yoxd707/32/8506_2.png) [@yoxd707](https://forum.makecode.com/u/yoxd707)\ **Post date:** [April 25, 2023, 4:29pm UTC](https://forum.makecode.com/t/making-a-terraria-like-game-need-help-with-an-error/19275/15 "2023-04-25T16:29:58Z")
This extension **only** serves to generate “noise” (numbers from 0 to 1), how and what you use it for is up to your imagination. The x and y coordinate parameters must contain decimals for correct operation, so I recommend multiplying those parameters by a scale. I suppose that this parameter is that of the noise1d function, it is the necessary coordinate to calculate the noise at that point (the one that should be multiplied by a scale) I am working on the extension that will be used to generate terrains in a simple way, but you can use the one that I left if you want to make your own implementation in something else. I leave a quick example on how to use the noise1d and noise2d function: > **[perlin-noise-example](https://arcade.makecode.com/S74129-93962-93318-21129)** > > Made with ❤️ in Microsoft MakeCode Arcade. ---
**Author:** ![YuHayate](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/yuhayate/32/8275_2.png) [@YuHayate](https://forum.makecode.com/u/YuHayate)\ **Post date:** [April 25, 2023, 9:21pm UTC](https://forum.makecode.com/t/making-a-terraria-like-game-need-help-with-an-error/19275/16 "2023-04-25T21:21:25Z")
Wow your extention is relly impressive ---
**Author:** ![YuHayate](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/yuhayate/32/8275_2.png) [@YuHayate](https://forum.makecode.com/u/YuHayate)\ **Post date:** [April 28, 2023, 4:50pm UTC](https://forum.makecode.com/t/making-a-terraria-like-game-need-help-with-an-error/19275/17 "2023-04-28T16:50:30Z")
i just made my first extention end added 2dNoise to it > **Code Here** > > ```auto > namespace SpriteKind { > export const Temporary = SpriteKind.create() > } > let tempNum = 0 > let TempImg = image.create(16, 16) > enum DegréesToRotate { > clockwise = 1, > counterclockwise = 2, > dubbleClockwise = 3 > } > enum Size { > Whith = 1, > Hight = 2 > } > function PixelValue (X: number, Y: number, Image2: Image) { > return (Image2.getPixel(X + 1, Y) + Image2.getPixel(X - 1, Y) + (Image2.getPixel(X, Y + 1) + Image2.getPixel(X, Y - 1)) + (Image2.getPixel(X + 1, Y + 1) + Image2.getPixel(X + 1, Y - 1) + (Image2.getPixel(X - 1, Y + 1) + Image2.getPixel(X - 1, Y - 1)))) / 8 > } > /** > * Image Editor > */ > //% weight=49 color=#f1992b icon="" > namespace Image_Editor { > /** > * TODO: describe your function here, > * @param myImage describe parameter here, > * @param myImage2 describe parameter here, > */ > //% block="draw $myImage onto $myImage2" > //% myImage.shadow=screen_image_picker > //% myImage2.shadow=screen_image_picker > export function Print(myImage: Image, myImage2: Image): Image { > let TempImg = myImage2.clone() > for (let X = 0; X <= TempImg.width; X++) { > for (let Y = 0; Y <= TempImg.height; Y++) { > if (myImage.getPixel(X, Y) != 0) { > myImage2.setPixel(X, Y, myImage.getPixel(X, Y)) > } > } > } > return myImage2 > } > } > namespace Image_Editor { > /** > * TODO: describe your function here, makes perline noise from en image > * @param Image2 describe parameter here, the image to Create prerline noise > * @param BlendingLevel describe parameter here, the Blending Level > */ > //% block="noise image onto $Image2 Thicness $BlendingLevel" > //% Image2.shadow=screen_image_picker > //% BlendingLevel.number > export function CreatePerline_image(Image2: Image, BlendingLevel: number) { > for (let X = 0; X <= Image2.width; X++) { > for (let Y = 0; Y <= Image2.height; Y++) { > if (X == 0 || Y == 0 || X == Image2.width - 1 || Y == Image2.height - 1) { > Image2.setPixel(X, Y, randint(12, 16)) > } else { > Image2.setPixel(X, Y, randint(3, 15)) > } > } > } > for (let Times = 0; Times <= 1; Times++) { > for (let X2 = 0; X2 <= Image2.width; X2++) { > Image2.setPixel(X2, Times * (Image2.height - 1), PixelValue(X2, Times * (Image2.height - 1), Image2) + 1) > } > for (let Y2 = 0; Y2 <= Image2.height; Y2++) { > Image2.setPixel(Times * (Image2.width - 1), Y2, PixelValue(Times * (Image2.width - 1), Y2, Image2) + 1) > } > } > for (let Times = 0; Times < BlendingLevel; Times++) { > for (let X2 = 0; X2 <= Image2.width - 3; X2++) { > for (let Y2 = 0; Y2 <= Image2.height - 3; Y2++) { > Image2.setPixel(X2 + 1, Y2 + 1, PixelValue(X2 + 1, Y2 + 1, Image2)) > } > } > } > > return Image2 > } > } > namespace Image_Editor { > /** > * TODO: describe your function here, rotate any square image > * @param myImage describe parameter here, the image you want to rotate > * @param Rotate describe parameter here, rotate it clockwise or counterclockwise > */ > //% block="Rotate $myImage 90° $Rotate" > //% myImage.shadow=screen_image_picker > //% Rotate.enum > > export function Rotate(myImage: Image, Rotate: DegréesToRotate): Image { > let TempImg = image.create(myImage.width, myImage.height) > if (Rotate == 1) { > for (let X1 = 0; X1 <= TempImg.width; X1++) { > for (let Y1 = 0; Y1 <= TempImg.height; Y1++) { > TempImg.setPixel(X1, Y1, myImage.getPixel(myImage.height - Y1, X1)) > } > } > } else if (Rotate == 2){ > for (let X2 = 0; X2 <= TempImg.width; X2++) { > for (let Y2 = 0; Y2 <= TempImg.height; Y2++) { > TempImg.setPixel(X2, Y2, myImage.getPixel(Y2, myImage.width - X2)) > } > } > } > return TempImg > } > } > namespace Image_Editor { > /** > * TODO: describe your function here, find the width or the height of en image > * @param image describe parameter here, the image you want to find the width or the height > * @param size describe parameter here, Choose if you want to know the width or the height > */ > //% block="$size of $MyImage " > //% MyImage.shadow=screen_image_picker > //% size.Size > // come back to this one > export function FindSizeOf(size: Size, MyImage: Image): number { > if (size == 1) { > return MyImage.width > } else { > return MyImage.height > } > } > } > namespace Image_Editor { > /** > * TODO: describe your function here, maks a grid with your image > * @param image describe parameter here, The image you want to make a grid of > * @param Xtimes describe parameter here, the amont of times to place your image on the X axes > * @param Ytimes describe parameter here, the amont of times to place your image on the Y axes > */ > //% block="Grid of $imagE size x $Xtimes y $Ytimes" > //% imagE.shadow=screen_image_picker > //% Xtimes.Number > //% Ytimes.Number > export function MakeGrid(imagE: Image, Xtimes: number, Ytimes: number): Image { > let TempImg = image.create(imagE.width * Xtimes, imagE.height * Ytimes) > for (let X = 0; X <= imagE.width * Xtimes; X++) { > for (let Y = 0; Y <= imagE.height * Ytimes; Y++) { > TempImg.setPixel(X, Y, imagE.getPixel(X % imagE.width, Y % imagE.height)) > } > } > return TempImg > } > } > > ``` its not the best but its good ---
**Author:** ![YuHayate](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/yuhayate/32/8275_2.png) [@YuHayate](https://forum.makecode.com/u/YuHayate)\ **Post date:** [April 28, 2023, 4:50pm UTC](https://forum.makecode.com/t/making-a-terraria-like-game-need-help-with-an-error/19275/18 "2023-04-28T16:50:35Z")
ya… i dont know how to use github