pgtwitter

JColorChooser RGB Rounding Issue in Java 21 on macOS

Summary

When using JColorChooser.showDialog with colorTransparencySelectionEnabled=false in Java 21 on macOS, RGB values in the range 0-64 are rounded down by 1 (e.g., 51/51/51/255 → 50/50/50/255), and values in 65-127 show inconsistent rounding (odd values match, even values are decremented by 1). This issue does not occur when colorTransparencySelectionEnabled=true or when using JColorChooser.createDialog with explicit JColorChooser instance management and the sequence of setColorTransparencySelectionEnabled(false) followed by setColor.

This document describes the issue, provides steps to reproduce, and outlines a workaround.

Environment

• Java: 21.0.7 LTS
• OS: macOS

pgtwitter

ハード

$ system_profiler SPHardwareDataType|grep "Chip\|Memory"
      Chip: Apple M1
      Memory: 16 GB

brewでollamaをインストール

$ brew install ollama

pgtwitter

ハード

$ system_profiler SPHardwareDataType|grep "Chip\|Memory"
      Chip: Apple M1
      Memory: 16 GB

brewでollamaをインストール

$ brew install ollama

pgtwitter

ハード

$ system_profiler SPHardwareDataType|grep "Chip\|Memory"
      Chip: Apple M1
      Memory: 16 GB

brewでollamaをインストール

$ brew install ollama

pgtwitter

# %%
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.collections import PolyCollection
from sklearn.decomposition import PCA
from scipy.spatial import Voronoi
from scipy.spatial import ConvexHull
import colorsys

pgtwitter

// clang -fobjc-arc -framework Foundation lockfile.m -o lockfile
#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        // ロックファイルのパス
        NSString *lockFilePath = @"/tmp/lockfile";
        
        // NSFileManagerのインスタンス
        NSFileManager *fileManager = [NSFileManager defaultManager];

pgtwitter

# %%
def morse2Dot(in_filename, out_filename):
    ROOT_LABEL = '(start)'
    ROOT_CODE = 'START'
    DUMMY = 'dummy'
    DOT_SHAPE = 'shape=circle'
    BAR_SHAPE = 'shape=rectangle'
    ROOT_SHAPE = 'shape=diamond'
    PROP_LINES = '\n\trankdir=TB;\n\tnodesep=0.5;\n\tpad=0.2;'
    DUMMY_NODE_ATTR = ', label="(N/A)", margin=0'

pgtwitter

def morse2Dot(fin, fout):
    class m:
        def __init__(self, l, c):
            self.c, self.n, self.cms, self.eA, self.nL, self.l, self.p = c, c.count('.'), [], DOT_eA if c[-1] == '.' else '', f'"{NA+c if l == NA else l}" [shape={SC if c[-1] == "." else SR}{NA_nA if l == NA else ""}];', f'{NA}{c}' if l == NA else l, RC if len(c) == 1 else c[0:-1]
    def eLines(n):
        ret = [f'"{n.l}" -> "{c.l}"[penwidth=2{c.eA}];' for c in n.cms]
        ret.extend([l for c in n.cms for l in eLines(c)])
        return ret
    RL, RC, NA, SC, SR, NA_nA, DOT_eA, L1 = '(start)', 'START', 'DUMMY', 'circle', 'rectangle', ',label="(N/A)", margin=0', ', weight=1000, style=dashed', '{rank=same;'
    L0, ms = f'rankdir=TB;msep=0.5;pad=0.2;"{RL}" [shape=diamond];', {RC: m(RL, RC)}

pgtwitter

# %%
def read_morse_file(filename):
    """モールス信号データをファイルから読み込む"""
    morse_data = {}
    with open(filename, 'r', encoding='utf-8') as f:
        for line in f:
            char, code = line.strip().split('\t')
            morse_data[char] = code
    return morse_data

pgtwitter

digraph MorseTree {
    rankdir=TB;
    bgcolor="white";
    nodesep=0.5;  // 左右間隔を維持
    pad=0.2;      // 余白を維持

    // ノード定義
    START [shape=rectangle];
    E [shape=rectangle]; A [shape=rectangle]; W [shape=rectangle]; J [shape=rectangle];
    I [shape=rectangle]; S [shape=rectangle]; H [shape=rectangle]; V [shape=rectangle];