Package io.keikai.range.impl.imexp

Class BookHelper

java.lang.Object

io.keikai.range.impl.imexp.BookHelper

public final class BookHelper
extends Object

Minimal helper retained for two cross-module utilities. The full POI-bound BookHelper has been deleted along with the legacy XLS import/export pipeline. New code should not add anything here — prefer the Rust JNI for color / theme / chart computations.

Author:

Hawk, Kuro (original)

Field Summary

Fields

Modifier and Type	Field	Description
static final String	AUTO_COLOR
static final int	SORT_HEADER_NO
static final int	SORT_HEADER_YES
static final int	SORT_NORMAL_DEFAULT
static final int	SORT_TEXT_AS_NUMBERS

Method Summary

Modifier and Type	Method	Description
static byte[]	getRgbWithTint(byte[] rgb, double tint)	Apply Excel's tint/shade transform to a base RGB color.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

AUTO_COLOR

public static final String AUTO_COLOR

See Also:

• Constant Field Values

SORT_NORMAL_DEFAULT

public static final int SORT_NORMAL_DEFAULT

See Also:

• Constant Field Values

SORT_TEXT_AS_NUMBERS

public static final int SORT_TEXT_AS_NUMBERS

See Also:

• Constant Field Values

SORT_HEADER_NO

public static final int SORT_HEADER_NO

See Also:

• Constant Field Values

SORT_HEADER_YES

public static final int SORT_HEADER_YES

See Also:

• Constant Field Values

Method Details

getRgbWithTint

public static byte[] getRgbWithTint(byte[] rgb,
 double tint)

Apply Excel's tint/shade transform to a base RGB color. Tint range is [-1, 1]: positive lightens (mixes toward white), negative darkens (mixes toward black), zero leaves the color unchanged.

Reference: ECMA-376 Part 1 §18.8.19 (color transforms); MS-OE376 §A.4.1.16. Algorithm: convert RGB → HSL, scale L by (1 - tint) when tint > 0 or (1 + tint) when tint < 0, convert back to RGB.

Parameters:

rgb - 3- or 4-byte array; if 4 bytes the first byte (alpha) is ignored

tint - in [-1, 1]

Returns:

the transformed 3-byte RGB (no alpha)