logisim-evolution/logisim-evolution

Shift-Register and Counter Appearance size do not match their content.

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#2,561 建立於 2026年4月22日

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bugenhancementhelp wantedpri std

描述

While working on https://github.com/logisim-evolution/logisim-evolution/pull/2556 I noticed that the Shift-Register does not increase its own width with higher bitwidths, even on older versions. On the other hand, the counter component does get wider, even if it only has one bit per step, and it gets unnecessarily large.

Here's basically what I'm talking about with both components set to 64-bit;

I did notice the counter size problem some time ago, and I usually just use the original logisim appearance for being much simpler and compact, but I think It would be better if it could have the same shape of the new regular registers, maybe a little bit wider to accomodate an extra input below.

As for the Shift-Register, it should just get wider, like the counter currently is, which should fix the values occluding the output.

I thought about fixing it in #2556, but I think this a complex enough problem to need its own discussion and PR

貢獻者指南

技術棧
java
領域
desktop
議題類型
bug
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
4
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-2 days
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
fresh
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
JavaSwing GUIDigital logic basicsLogisim component model
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
50
研究方向
Examine the component rendering code for Shift Register and Counter in the Logisim evolution source. Look for methods that calculate the component's bounding box or width based on bitwidth attribute. The issue notes that Shift Register does not enlarge with higher bitwidths, while Counter grows unnecessarily large. Compare with the behavior of the regular register component. The screenshots show desired appearance. Consider reviewing the discussion and referenced PR #2556 for additional context. Files to investigate likely include the ShiftRegister.java and Counter.java in the components directory.