Cocos2dx change line
在 cocos2dx change line 的实现中，我们可以简单的使用dimensions属性控制换行。使用它只需将对应的参数值传入构造函数，或者调用 setDimensions 函数即可。
它的换行策略是：当一个单词超出限制长度时，将它移动到下一行。有时这种策略并不合适。例如，在某些语言中，单词都比较长。如果采用这种策略，会出现每一行中只有一个单词。因此需要更改换行策略。当超出限制长度时，使用-作为一个分隔单词的标志。
换行策略调用
通过查看Cocos2d-x中换行的实现方式，我发现换行策略是区分平台编程出来的代码。也就是说，为了更改换行策略，我需要分别编写 IOS 和 Java 两部分代码。因为我的目标平台是 Android 平台，因此我只对Java文件进行了更改。IOS 平台的换行策略调用的是系统函数，有兴趣研究的读者可以跟踪源码更改。入口函数为: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 / 255,textDefinition->m_fontFillColor.g / 255,textDefinition->m_fontFillColor.b / 255,shadowEnabled,shadowDX,shadowDY,shadowOpacity,shadowBlur,strokeEnabled,strokeColorR,strokeColorG,strokeColorB,strokeSize);
CC_BREAK_IF(!bRet);
bRet = initWithImage(pImage);
} while (0);
......
}
更改Java实现
Android 平台对应的 Java 文件位于 $(2DX-Root)/cocos2dx/platform/android/java/src/org/cocos2dx/lib 文件夹中，文件名是 Cocos2dxBitmap.java
首先，我增加了 divideStringWithMaxWidthByFlag 函数，将它作为另一个换行策略的实现函数。
// add by fansy for "—" style words
private static LinkedList<String> divideStringWithMaxWidthByFlag(
final String pString,final int pMaxWidth,final Paint pPaint) {
final int charLength = pString.length();
int start = 0;
int tempWidth = 0;
LinkedList<String> strList = new LinkedList<String>();
if( !isChinese(pString) )
{
/* Break a String into String[] by the width & should 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;
}
// 根据Unicode编码完美的判断中文汉字和符号
private static boolean isChinese(char c) {
Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);
if (ub == Character.UnicodeBlock.CJK_UNIFIED_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;
}
// 完整的判断中文汉字和符号
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
private static String[] splitString(final String pString,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 LinkedList<String> strList = new LinkedList<String>();
for (final String line : lines) {
/*
* The width of line is exceed maxWidth,should divide it into
* two or more lines.
*/
final int lineWidth = (int) FloatMath.ceil(pPaint
.measureText(line));
if (lineWidth > pMaxWidth) {
strList.addAll(Cocos2dxBitmap.divideStringWithMaxWidthByFlag(
line,pPaint));
} else {
strList.add(line);
......
}
更换调用函数后，编译打包，运行程序即可看到不同的换行效果。
本篇博客出自 阿修罗道 ，转载请注明出处，禁止用于商业用途： http://blog.csdn.net/fansongy/article/details/39992241 原文链接：https://www.f2er.com/cocos2dx/347035.html
