Change Text wrap style (cocos2dx change line)

Change Text wrap style (cocos2dx change line)
Cocos2dx change line

In the implementation of cocos2dx change line, we can simply usedimensionsAttribute control line feed. You only need to pass the corresponding parameter values to the constructor or call the setDimensions function.

Its line feed policy is: when a word exceeds the limit length, move it to the next line. Sometimes this policy is not suitable. For example, in some languages, words are long. If this policy is used, only one word exists in each row. Therefore, you need to change the line feed policy. When the length exceeds the limit, use-As a sign to separate words.

Line feed policy call

By looking at the implementation of line feed in the Cocos2d-x, I found that line feed policies distinguish the code programmed by the platform. That is to say, to change the line feed policy, I need to write IOS and Java code separately. Because my target platform is Android, I only made changes to the Java file. The line feed policy of IOS platform calls system functions. Readers interested in the research can track source code changes. The entry function is:

 

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Bool CCTexture2D: initWithString (const char * text, ccFontDefinition * textDefinition ){...... CCImage * pImage = new CCImage (); do {CC_BREAK_IF (NULL = pImage); bRet = pImage-> initWithStringShadowStroke (text, (int) textDefinition-> m_dimensions.width, (int) textDefinition-> m_dimensions.height, eAlign, textDefinition-> m_fontName.c_str (), textDefinition-> m_fontSize, textDefinition-> m_fontFillColor.r/25 5, textDefinition-> activities/255, textDefinition-> activities/255, shadowEnabled, shadowDX, shadowDY, shadowDY, shadowBlur, strokeEnabled, strokeColorR, strokeColorG, strokeColorB, strokeSize); Complete (! BRet); bRet = initWithImage (pImage);} while (0 );......}

 

Change Java Implementation

The Java file corresponding to the Android platform is located in the $ (2DX-Root)/cocos2dx/platform/android/java/src/org/cocos2dx/lib folder, and the file name is Cocos2dxBitmap. java

First, I added the divideStringWithMaxWidthByFlag function, which serves as an implementation function of another line feed policy.

 

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// Add by fansy for-style words private static comment list DivideStringWithMaxWidthByFlag (final String pString, final int pMaxWidth, final Paint pPaint) {final int charLength = pString. length (); int start = 0; int tempWidth = 0; shortlist StrList = new external list (); If (! IsChinese (pString) {/* Break a String into String [] by the width & shoshould wrap the word. */for (int I = 1; I <charLength-1; ++ I) {tempWidth = (int) FloatMath. ceil (pPaint. measureText (pString, start, I + 1); if (tempWidth> = pMaxWidth) {if (pString. charAt (I) = '') // end with {// change line at I strList. add (pString. substring (start, I); I = I + 1; // skip space} else if (I> 1 & pString. charAt (I-2) = '') // only one-left after change line {// change line at I-2 strList. add (pString. substring (start, I-2); I = I-2; // skip space} else if (I> 0 & pString. charAt (I-1) = '') // only one-left after change line {// change line at I-1 strList. add (pString. substring (start, I-1); I = I-1; // skip space} else if (I> 0) // replace-at I-2 {// split at I-1 add-at tail change line at I-1 strList. add (pString. substring (start, I-1) +-); I --;}/* Remove spaces at the beginning of a new line. */while (pString. charAt (I) = '') {++ I;} start = I ;}}/* Add the last chars. */if (start <charLength) {strList. add (pString. substring (start) ;}} else {strList = divideStringWithMaxWidth (pString, pMaxWidth, pPaint);} return strList ;} // judge Chinese characters and symbols private static boolean isChinese (char c) {Character based on Unicode encoding. unicodeBlock ub = Character. unicodeBlock. of (c); if (ub = Character. unicodeBlock. cjk_uniied_ideographs | ub = Character. unicodeBlock. CJK_COMPATIBILITY_IDEOGRAPHS | ub = Character. unicodeBlock. CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A | ub = Character. unicodeBlock. CJK_UNIFIED_IDEOGRAPHS_EXTENSION_ B | ub = Character. unicodeBlock. CJK_SYMBOLS_AND_PUNCTUATION | ub = Character. unicodeBlock. HALFWIDTH_AND_FULLWIDTH_FORMS | ub = Character. unicodeBlock. GENERAL_PUNCTUATION) {return true;} return false;} // complete judgment of Chinese characters and symbols public static boolean isChinese (String strName) {char [] ch = strName. toCharArray (); for (int I = 0; I <ch. length; I ++) {char c = ch [I]; if (isChinese (c) {return true ;}} return false ;}// end add by fansy

 

After adding a function, modify the call in splitString:

 

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Private static String [] splitString (final String pString, final int pMaxWidth, final int pMaxHeight, final Paint pPaint) {final String [] lines = pString. split (\ n); String [] ret = null; final FontMetricsInt fm = pPaint. getFontMetricsInt (); final int heightPerLine = (int) Math. ceil (fm. bottom-fm. top); final int maxLines = pMaxHeight/heightPerLine; if (pMaxWidth! = 0) {final partition list StrList = new external list (); For (final String line: lines) {/** The width of line is exceed maxWidth, shocould divide it into * two or more lines. */final int lineWidth = (int) FloatMath. ceil (pPaint. measureText (line); if (lineWidth> pMaxWidth) {strList. addAll (Cocos2dxBitmap. divideStringWithMaxWidthByFlag (line, pMaxWidth, pPaint);} else {strList. add (line );......}

 

After the function is changed, compile and package it, and run the program to see different line breaks.