/*
* Copyright (C) 2012 www.amsoft.cn
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.ab.util;
import java.util.ArrayList;
import java.util.List;
import android.graphics.Canvas;
import android.graphics.Paint.FontMetrics;
import android.text.Layout;
import android.text.TextPaint;
// TODO: Auto-generated Javadoc
/**
* © 2012 amsoft.cn
* 名称：AbGraphic.java
* 描述：图形处理类.
*
* @author 还如一梦中
* @version v1.0
* @date：2013-01-17 下午11:52:13
*/
public final class AbGraphicUtil {
/**
* 描述：获取字符的所在位置（按像素获取最大能容纳的）.
*
* @param str 指定的字符串
* @param maxPix 要取到的位置（像素）
* @param paint the paint
* @return 字符的所在位置
*/
public static int subStringLength(String str,int maxPix,TextPaint paint) {
if(AbStrUtil.isEmpty(str)){
return 0;
}
int currentIndex = 0;
for (int i = 0; i < str.length(); i++) {
//获取一个字符
String temp = str.substring(0, i + 1);
float valueLength = paint.measureText(temp);
if(valueLength > maxPix){
currentIndex = i-1;
break;
}else if(valueLength == maxPix){
currentIndex = i;
break;
}
}
//短于最大像素返回最后一个字符位置
if(currentIndex==0){
currentIndex = str.length()-1 ;
}
return currentIndex;
}
/**
* 描述：获取文字的像素宽.
*
* @param str the str
* @param paint the paint
* @return the string width
*/
public static float getStringWidth(String str,TextPaint paint) {
float strWidth = paint.measureText(str);
return strWidth;
}
/**
* 获得文字的宽度
* @param str the str
* @param paint the paint
* @return the string width
*/
public static float getDesiredWidth(String str,TextPaint paint) {
float strWidth = Layout.getDesiredWidth(str, paint);
return strWidth;
}
/**
* 获取文字的高度
* @param paint the textPaint
* @return the string height
*/
public static float getDesiredHeight(TextPaint paint) {
FontMetrics fm = paint.getFontMetrics();
return (float)Math.ceil(fm.descent - fm.ascent);
}
/**
* 解析成行.
* @param text the text
* @param maxWPix the max w pix
* @param paint the paint
* @return the draw row count
*/
public static List<String> getDrawRowStr(String text,int maxWPix,TextPaint paint) {
String [] texts = null;
if(text.indexOf("\n")!=-1){
texts = text.split("\n");
}else{
texts = new String [1];
texts[0] = text;
}
//共多少行
List<String> mStrList = new ArrayList<String>();
for(int i=0;i<texts.length;i++){
String textLine = texts[i];
//计算这个文本显示为几行
while(true){
//可容纳的最后一个字的位置
int endIndex = subStringLength(textLine,maxWPix,paint);
if(endIndex<=0){
mStrList.add(textLine);
}else{
if(endIndex == textLine.length()-1){
mStrList.add(textLine);
}else{
mStrList.add(textLine.substring(0,endIndex+1));
}
}
//获取剩下的
if(textLine.length()>endIndex+1){
//还有剩下的
textLine = textLine.substring(endIndex+1);
}else{
break;
}
}
}
return mStrList;
}
/**
*
* 描述：获取这段文本多少行.
* @param text
* @param textSize
* @param maxWPix
* @return
*/
public static int getDrawRowCount(String text,int maxWPix,TextPaint paint) {
String [] texts = null;
if(text.indexOf("\n")!=-1){
texts = text.split("\n");
}else{
texts = new String [1];
texts[0] = text;
}
//共多少行
List<String> mStrList = new ArrayList<String>();
for(int i=0;i<texts.length;i++){
String textLine = texts[i];
//计算这个文本显示为几行
while(true){
//可容纳的最后一个字的位置
int endIndex = subStringLength(textLine,maxWPix,paint);
if(endIndex<=0){
mStrList.add(textLine);
}else{
if(endIndex == textLine.length()-1){
mStrList.add(textLine);
}else{
mStrList.add(textLine.substring(0,endIndex+1));
}
}
//获取剩下的
if(textLine.length()>endIndex+1){
//还有剩下的
textLine = textLine.substring(endIndex+1);
}else{
break;
}
}
}
return mStrList.size();
}
/**
* 描述：绘制文本，支持换行.
*
* @param canvas the canvas
* @param text the text
* @param maxWPix the max w pix
* @param paint the paint
* @param left the left
* @param top the top
* @return the int
*/
public static int drawText(Canvas canvas,String text,int maxWPix,TextPaint paint,int left,int top) {
if(AbStrUtil.isEmpty(text)){
return 1;
}
//需要根据文字长度控制换行
//测量文字的长度
List<String> mStrList = getDrawRowStr(text,maxWPix,paint);
int hSize = (int)getDesiredHeight(paint);
for(int i=0;i<mStrList.size();i++){
//计算坐标
int x = left;
int y = top+hSize/2+hSize*i;
String textLine = mStrList.get(i);
canvas.drawText(textLine,x,y, paint);
}
return mStrList.size();
}
}