From 5cf512174e197b200f72656096d9b426aa2be137 Mon Sep 17 00:00:00 2001 From: Nick Burch Date: Wed, 25 Nov 2009 11:45:37 +0000 Subject: Patch from Jeremy Michelson (with slight tweaks) - bug #48274 - fix erronious wrapping of byte colours in HSSFPalette.findSimilarColor git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@884061 13f79535-47bb-0310-9956-ffa450edef68 --- src/documentation/content/xdocs/status.xml | 3 +- .../org/apache/poi/hssf/usermodel/HSSFPalette.java | 30 ++++++++++-- .../apache/poi/hssf/usermodel/TestHSSFPalette.java | 57 +++++++++++++++++++++- 3 files changed, 84 insertions(+), 6 deletions(-) (limited to 'src') diff --git a/src/documentation/content/xdocs/status.xml b/src/documentation/content/xdocs/status.xml index fcba869f2d..10e006b4e3 100644 --- a/src/documentation/content/xdocs/status.xml +++ b/src/documentation/content/xdocs/status.xml @@ -34,7 +34,8 @@ - 24601 - fix fetching of error codes from XSSF formula cells + 48274 - fix erronious wrapping of byte colours in HSSFPalette.findSimilarColor + 48269 - fix fetching of error codes from XSSF formula cells 48229 - fixed javadoc for HSSFSheet.setColumnWidth and XSSFSheet setColumnWidth 47757 - fixed XLSX2CSV to avoid exception when processing cells with multiple "t" elements 48195 - short-circuit evaluation of IF() and CHOOSE() diff --git a/src/java/org/apache/poi/hssf/usermodel/HSSFPalette.java b/src/java/org/apache/poi/hssf/usermodel/HSSFPalette.java index 8cf3a8b550..0095daddbe 100644 --- a/src/java/org/apache/poi/hssf/usermodel/HSSFPalette.java +++ b/src/java/org/apache/poi/hssf/usermodel/HSSFPalette.java @@ -98,16 +98,30 @@ public final class HSSFPalette { * @return The closest color or null if there are no custom * colors currently defined. */ - public HSSFColor findSimilarColor(byte red, byte green, byte blue) - { + public HSSFColor findSimilarColor(byte red, byte green, byte blue) { + return findSimilarColor(unsignedInt(red), unsignedInt(green), unsignedInt(blue)); + } + /** + * Finds the closest matching color in the custom palette. The + * method for finding the distance between the colors is fairly + * primative. + * + * @param red The red component of the color to match. + * @param green The green component of the color to match. + * @param blue The blue component of the color to match. + * @return The closest color or null if there are no custom + * colors currently defined. + */ + public HSSFColor findSimilarColor(int red, int green, int blue) { HSSFColor result = null; int minColorDistance = Integer.MAX_VALUE; byte[] b = _palette.getColor(PaletteRecord.FIRST_COLOR_INDEX); for (short i = PaletteRecord.FIRST_COLOR_INDEX; b != null; b = _palette.getColor(++i)) { - int colorDistance = Math.abs(red - b[0]) + - Math.abs(green - b[1]) + Math.abs(blue - b[2]); + int colorDistance = Math.abs(red - unsignedInt(b[0])) + + Math.abs(green - unsignedInt(b[1])) + + Math.abs(blue - unsignedInt(b[2])); if (colorDistance < minColorDistance) { minColorDistance = colorDistance; @@ -116,6 +130,14 @@ public final class HSSFPalette { } return result; } + + /** + * Turn a byte of between -127 and 127 into something between + * 0 and 255, so distance calculations work as expected. + */ + private int unsignedInt(byte b) { + return 0xFF & ((int) b); + } /** * Sets the color at the given offset diff --git a/src/testcases/org/apache/poi/hssf/usermodel/TestHSSFPalette.java b/src/testcases/org/apache/poi/hssf/usermodel/TestHSSFPalette.java index 39050ccd8c..751547071f 100644 --- a/src/testcases/org/apache/poi/hssf/usermodel/TestHSSFPalette.java +++ b/src/testcases/org/apache/poi/hssf/usermodel/TestHSSFPalette.java @@ -17,6 +17,7 @@ package org.apache.poi.hssf.usermodel; +import java.util.Arrays; import java.util.Iterator; import java.util.Map; @@ -24,6 +25,7 @@ import junit.framework.TestCase; import org.apache.poi.hssf.HSSFTestDataSamples; import org.apache.poi.hssf.record.PaletteRecord; +import org.apache.poi.hssf.usermodel.HSSFPalette; import org.apache.poi.hssf.util.HSSFColor; /** @@ -137,6 +139,49 @@ public final class TestHSSFPalette extends TestCase { public void testFindSimilar() { HSSFWorkbook book = new HSSFWorkbook(); HSSFPalette p = book.getCustomPalette(); + + /* first test the defaults */ + assertTrue( + Arrays.equals( + new short[] {(short) 255, (short) 255, (short) 0}, // not [204, 255, 255] + p.findSimilarColor((byte) 204, (byte) 255, (byte) 0).getTriplet() + ) + ); + + assertTrue( + Arrays.equals( + new short[] {(short) 153, (short) 204, (short) 0}, // not [128, 0, 0] + p.findSimilarColor((byte) 128, (byte) 255, (byte) 0).getTriplet() + ) + ); + + assertTrue( + Arrays.equals( + new short[] {(short) 0, (short) 255, (short) 0}, // not [0, 51, 102] + p.findSimilarColor((byte) 0, (byte) 255, (byte) 102).getTriplet() + ) + ); + + assertTrue( + Arrays.equals( + new short[] {(short) 0, (short) 102, (short) 204}, // not [255, 102, 0] + p.findSimilarColor((byte) 0, (byte) 102, (byte) 255).getTriplet() + ) + ); + + assertTrue( + Arrays.equals( + new short[] {(short) 255, (short) 0, (short) 255}, // not [128, 0, 0] + p.findSimilarColor((byte) 128, (byte) 0, (byte) 255).getTriplet() + ) + ); + + assertTrue( + Arrays.equals( + new short[] {(short) 255, (short) 0, (short) 255}, // not [255, 255, 153] + p.findSimilarColor((byte) 255, (byte) 0, (byte) 153).getTriplet() + ) + ); // Add a few edge colours in @@ -175,8 +220,18 @@ public final class TestHSSFPalette extends TestCase { p.getColor((short)12).getHexString(), p.findSimilarColor((byte)-1, (byte)2, (byte)10).getHexString() ); + + // And with ints not bytes + assertEquals( + p.getColor((short)11).getHexString(), + p.findSimilarColor(255, 2, 1).getHexString() + ); + assertEquals( + p.getColor((short)12).getHexString(), + p.findSimilarColor(255, 2, 10).getHexString() + ); } - + /** * Verifies that the generated gnumeric-format string values match the * hardcoded values in the HSSFColor default color palette -- cgit v1.2.3