關於 i want to draw you ，我們在網路上蒐集到這些相關的討論、資訊與評價

New Patreon GEM Bible Study teaching: Draw Out This Deep Water and Win!
https://www.patreon.com/posts/56491831

In this teaching, you will discover:
- How to make decisions based on something better and more accurate than our logic
- How to tap on a precious resource inside you that can help you with any situation in life
- How to recognize when God is speaking to you
- How you can learn and become proficient in anything without even being taught by a human teacher
- a special prayer

If you are blessed by the daily teachings/devotionals I share freely on this page, you can become a “God Every Morning” tier or above patron on Patreon if you want to receive an additional daily Bible Study teaching, as well as all my eBooks! Your patronage supports this ministry and enables us to “reach more and teach more” in the body of Christ: http://Patreon.com/miltongohblog

📜 [專欄新文章] Gas Efficient Card Drawing in Solidity

✍️ Ping Chen

📥 歡迎投稿： https://medium.com/taipei-ethereum-meetup #徵技術分享文 #使用心得 #教學文 #medium

Assign random numbers as the index of newly minted NFTs

Scenario

The fun of generative art NFT projects depends on randomness. The industry standard is “blind box”, where both the images’ serial number and the NFTs’ index are predetermined but will be shifted randomly when the selling period ends. (They call it “reveal”) This approach effectively solves the randomness issue. However, it also requires buyers to wait until the campaign terminates. What if buyers want to know the exact card right away? We’ll need a reliable onchain card drawing solution.

The creator of Astrogator🐊 isn’t a fan of blind boxes; instead, it thinks unpacking cards right after purchase is more interesting.

Spec

When initializing this NFT contract, the creator will determine the total supply of it. And there will be an iterable function that is randomly picking a number from the remaining pool. The number must be in range and must not collide with any existing ones.

Our top priority is accessibility/gas efficiency. Given that gas cost on Ethereum is damn high nowadays, we need an elegant algorithm to control gas expanse at an acceptable range.

Achieving robust randomness isn’t the primary goal here. We assume there’s no strong financial incentive to cheat, so the RNG isn’t specified. Implementers can bring their own source of randomness that they think is good enough.

Implementation

Overview

The implementation is pretty short and straightforward. Imagine there’s an array that contains all remaining(unsold) cards. When drawIndex() is called, it generates a (uniform) random seed to draw a card from the array, shortens the array, and returns the selected card.

Algorithm

Drawing X cards from a deck with the same X amount of cards is equal to shuffling the deck and dealing them sequentially. It’s not a surprise that our algorithm is similar to random shuffling, and the only difference is turning that classic algo into an interactive version.

A typical random shuffle looks like this: for an array with N elements, you randomly pick a number i in (0,N), swap array[0] and array[i], then choose another number i in (1,N), swap array[1] and array[i], and so on. Eventually, you’ll get a mathematically random array in O(N) time.

So, the concept of our random card dealing is the same. When a user mints a new card, the smart contract picks a number in the array as NFT index, then grabs a number from the tail to fill the vacancy, in order to keep the array continuous.

Tweak

Furthermore, as long as the space of the NFT index is known, we don’t need to declare/initialize an array(which is super gas-intensive). Instead, assume there’s such an array that the n-th element is n, we don’t actually initialize it (so it is an array only contains “0”) until the rule is broken.

For the convenience of explanation, let’s call that mapping cache. If cache[i] is empty, it should be interpreted as i instead of 0. On the other hand, when a number is chosen and used, we’ll need to fill it up with another unused number. An intuitive method is to pick a number from the end of the array, since the length of the array is going to decrease by 1.

By doing so, the gas cost in the worst-case scenario is bound to be constant.

Performance and limitation

Comparing with the normal ascending index NFT minting, our random NFT implementation requires two extra SSTORE and one extra SLOAD, which cost 12600 ~ 27600 (5000+20000+2600) excess gas per token minted.

Theoretically, any instantly generated onchain random number is vulnerable. We can restrict contract interaction to mitigate risk. The mitigation is far from perfect, but it is the tradeoff that we have to accept.

ping.eth

Gas Efficient Card Drawing in Solidity was originally published in Taipei Ethereum Meetup on Medium, where people are continuing the conversation by highlighting and responding to this story.

👏 歡迎轉載分享鼓掌

2022 手帳季新品 - 喫茶OURS 貼紙包！
(English at bottom!)
⁡
這次除了手帳，我們還會上架好久不見的複合材質貼紙包！用好想念的日本喫茶店當作主題，用水彩繪製的點心和餐點，通通一口氣上菜給你！
⁡
好想吃鮮奶油水果三明治喔...（哭出來）
⁡
一包裡面會有三種紙質：
模造紙 ( 覆蓋力最好，飽和度中等 ）
透明貼紙 ( 覆蓋力低，飽和度最高 )
和紙貼紙 ( 貼起來最自然，飽和度中等 )
⁡
會在今晚 (09/15) 21:00 和手帳一起於官方網站登場，敬請期待喔喔喔！
⁡
Cafe OURS - mix material sticker pack.
⁡
Besides the 2022 journal, this sticker pack will be avaliable too! Image the Japan style old cafe, I draw those meals / drinks for sticker!
⁡
There's 3 different material in this pack:
paper / clear / washi
⁡
Different opacity, color and texture can handle all scene you want to paste, did you like them?
⁡
It will be avaliable at tonight (09/15 wed) 21:00 (GMT+8), see you!

#漢克 #ours森林好朋友 #貼紙 #シール #文具 #文房具 #喫茶 #cafe #watercolor #watercolors

ขอขอบคุณเหล่านักพากย์มากๆเลยจ้า!!?
((Thanks to the voice actor!!?))
คุณ BasicBomb
เพจสำหรับติดตาม : https://www.facebook.com/69BASICBOMB69/
คุณ JEFFY RUN OVER
เพจสำหรับติดตาม : https://www.facebook.com/adminJEFFY
คุณ Camuri
เพจสำหรับติดตาม : https://www.facebook.com/CaMuRibird
และคุณ Deadsoul Mos(นักพากย์เสียงประจำบัคแจ็คในไอเดน)??
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สวัสดีเพื่อนๆทุกท่านจากทั่วโลกนะคะ อนิเมชั่นนี้เคยคุยเล่นๆกับน้อง Camuri ว่าอยากจะลองจับตัวละครของเราเองมาแต่งคอสเพลย์ดูบ้าง ตอนแรกจะวาดอย่างเดียวแต่ไปๆมาๆงั้นก็ทำเป็นอนิเมชั่นเลยละกัน จริงๆคิดจะให้ Pon แต่งเป็นมุซันในเรื่องดาบอสูตรนะคะ แต่ไปตัดสินใจขอแต่งเป็นดาร์คช็อกโก้แทน(จากเกมส์ cookie run kingdom) ส่วนคนอื่นๆเพื่อนๆหน้าจะพอดูออกแน่นอนค่ะว่าใครแต่งเป็นใครบ้าง ถ้าหากเพื่อนๆคิดอยากให้ Pon Rost Voning หรือต้าวมังกรkiruru ให้แต่งเป็นใครเดี๋ยวจะวาดมาลงเพจให้นะคะ 555555+ ???
และขอขอบคุณเพื่อนๆทุกท่านที่ติดตามผลงานของเรานะคะ ไว้เจอกันโปรเจคหน้านะคะ ???
---------------------------
Hello friends from all over the world. In this work I talked to my friend Camuri. I talked to him about how to cosplay for characters. But I feel that drawing is still not fun.
So I imagined making animations just for fun and to bring the characters to life with cosplay. And each of them will be dressed differently. I think the friends will see who they make up and from what games they are.
At first I wanted Pon to dress up as a muzan from Kimetsu No Yaiba, but I decided to make him a dark cocoa cookie in the cookie run kingdom game. If my friends want to see my characters Pon Rost Voning and kiruru in Cosplay. I will try to draw them on the page of course! LOLOLOL!???
And thank you to my friends for always following my work. See you next time in my project. ??

(If the translation is wrong, really sorry!)
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Music used : Where I am From , Trancer
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(สามารถติดตามผลงานภาพวาดหรืออื่นๆได้ที่นี่นะคะ)
You can follow up on other channels here.
► http://kiruru2592.deviantart.com/
► https://twitter.com/KiruruFon
► https://www.facebook.com/VoningAndKiruru/?view_public_for=1819356651678212
If something goes wrong, I'm sorry and Thank You!!

Unicorn Bento Lunch Box requested by my daughter (6years3months). And blue one for my son. hehe

I can't believe my daughter is graduating from Kindergarten in 7 days. By the time I upload this video will be in a few days. I want this moment to last forever. I have been noticing the time passing so quickly since I started to count down her graduation. Until then it was like a blink. I know time flies even from now on. Let's cherish each day!

Trick to make Kawaii bento in busy morning is to draw a sketch. You can cut out some of the parts (cheese, Nori sheet, ham, fishcake, etc...) night before to save time.

Deco Furi to make colored Onigiri and Charafuru for cute Bento toppings (Dried Kamaboko fish cakes): キャラフルとデコふり
https://amzn.to/3kUauQB

Colorful Fu Stars カラふル 麩 星 20g
https://amzn.to/38A7wfa

More Bento Ideas:
https://www.youtube.com/playlist?list=PL43FE4EDA496FA137

レシピ（日本語）
https://cooklabo.blogspot.com/2021/03/Unicorn-Bento.html

Music by
YouTube Audio Library

Follow me on social media. If you have recreated any of my food, you can share some pictures #ochikeron. I am always happy to see them.

♥FOLLOW ME HERE♥
http://instagram.com/ochikeron/
https://www.facebook.com/ochikeron
https://plus.google.com/+ochikeron
http://twitter.com/ochikeron

♥My COOKBOOK available on Amazon Kindle♥
http://amzn.to/2EwR3ah
NO MORE hard copies... those who got one are lucky!

♥More Written Recipes are on my BLOG♥
http://createeathappy.blogspot.com/

♥My Recipe Posts in Japanese♥
http://cooklabo.blogspot.jp/
http://cookpad.com/ami
http://twitter.com/alohaforever

♥and of course PLEASE SUBSCRIBE♥
http://www.youtube.com/user/ochikeron?sub_confirmation=1

Add me on Instagram to see my web toons:
http://www.instagram.com/bubzcomics


It’s funny how life works out. Drawing was so integral throughout my entire childhood and early teen years. I used to write and draw my own comics with my cousins. We made our own little club and we would spend our weekends reading each other’s work. Then became life’s distractions like school work, boys, teen things, university, partying, work, marriage, parenthood, divorce and co parenting life. Now I have come back to my roots by drawing again. It’s been a great outlet for me. When I hold my stylus, I only focus on my strokes. It calms me. I’m so thankful for art.

Please join me on my art venture if you want to see my web toons http://www.instagram.com/bubzcomics


Music by kelsat - Exhale - https://thmatc.co/?l=E0810290
The Lights Ahead by MJ Lee: https://mjleedot.com/



Hi, I'm Lindy! Welcome to the Bubz family. I am a beauty, lifestyle and mom vlogger. I make daily vlogs I call daily doses of happiness! Join me as I navigate this journey we call life and keep up with my little adventures. Be sure to SUBSCRIBE so I can continue to put a smile on your face. Do make new friends with fellow Bubscribers. I promise you they are the sweetest bunch ever! If you enjoyed today’s vlog, don’t forget to give it a LIKE.

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