Cocos2dx change line
在 cocos2dx change line 的实现中，我们能够简单的使用 dimensions属性控制换行。使用它仅仅需将相应的參数值传入构造函数，或者调用 setDimensions 函数就可以。
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。
有时这样的策略并不合适。
比如。在某些语言中，单词都比較长。
假设採用这样的策略。会出现每一行中仅仅有一个单词。
因此须要更改换行策略。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，我须要分别编写 IOS 和 Java 两部分代码。
由于我的目标平台是 Android 平台，因此我仅仅对Java文件进行了更改。IOS 平台的换行策略调用的是系统函数，有兴趣研究的读者能够跟踪源代码更改。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 平台相应的 Java 文件位于 $(2DX-Root)/cocos2dx/platform/android/java/src/org/cocos2dx/lib 目录中。文件名称是 Cocos2dxBitmap.java
首先，我添加了 divideStringWithMaxWidthByFlag 函数。将它作为还有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;
}
// 依据Unicode编码完美的推断中文汉字和符号
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;
}
// 完整的推断中文汉字和符号
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添加函数之后。改动在 splitString 中的调用：
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 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, pMaxWidth, pPaint));
} else {
strList.add(line);
......
}更换调用函数后，编译打包。执行程序就可以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