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package com.hmw.picmark;
import java.awt.alphacomposite;
import java.awt.color;
import java.awt.font;
import java.awt.graphics2d;
import java.awt.image;
import java.awt.geom.affinetransform;
import java.awt.image.affinetransformop;
import java.awt.image.bufferedimage;
import java.io.file;
import java.io.ioexception;
import javax.imageio.imageio;
/**
* 图片工具类， 图片水印，文字水印，缩放，补白等
* @author carl he
*/
public final class imageutils {
/**图片格式：jpg*/
private static final string pictrue_formate_jpg = "jpg";
private imageutils(){}
/**
* 添加图片水印
* @param targetimg 目标图片路径，如：c://mypictrue//1.jpg
* @param waterimg 水印图片路径，如：c://mypictrue//logo.png
* @param x 水印图片距离目标图片左侧的偏移量，如果x<0, 则在正中间
* @param y 水印图片距离目标图片上侧的偏移量，如果y<0, 则在正中间
* @param alpha 透明度(0.0 -- 1.0, 0.0为完全透明，1.0为完全不透明)
*/
public final static void pressimage(string targetimg, string waterimg, int x, int y, float alpha) {
try {
file file = new file(targetimg);
image image = imageio.read(file);
int width = image.getwidth(null);
int height = image.getheight(null);
bufferedimage bufferedimage = new bufferedimage(width, height, bufferedimage.type_int_rgb);
graphics2d g = bufferedimage.creategraphics();
g.drawimage(image, 0, 0, width, height, null);
image waterimage = imageio.read(new file(waterimg)); // 水印文件
int width_1 = waterimage.getwidth(null);
int height_1 = waterimage.getheight(null);
g.setcomposite(alphacomposite.getinstance(alphacomposite.src_atop, alpha));
int widthdiff = width - width_1;
int heightdiff = height - height_1;
if(x < 0){
x = widthdiff / 2;
}else if(x > widthdiff){
x = widthdiff;
}
if(y < 0){
y = heightdiff / 2;
}else if(y > heightdiff){
y = heightdiff;
}
g.drawimage(waterimage, x, y, width_1, height_1, null); // 水印文件结束
g.dispose();
imageio.write(bufferedimage, pictrue_formate_jpg, file);
} catch (ioexception e) {
e.printstacktrace();
}
}
/**
* 添加文字水印
* @param targetimg 目标图片路径，如：c://mypictrue//1.jpg
* @param presstext 水印文字， 如：中国证券网
* @param fontname 字体名称， 如：宋体
* @param fontstyle 字体样式，如：粗体和斜体(font.bold|font.italic)
* @param fontsize 字体大小，单位为像素
* @param color 字体颜色
* @param x 水印文字距离目标图片左侧的偏移量，如果x<0, 则在正中间
* @param y 水印文字距离目标图片上侧的偏移量，如果y<0, 则在正中间
* @param alpha 透明度(0.0 -- 1.0, 0.0为完全透明，1.0为完全不透明)
*/
public static void presstext(string targetimg, string presstext, string fontname, int fontstyle, int fontsize, color color, int x, int y, float alpha) {
try {
file file = new file(targetimg);
image image = imageio.read(file);
int width = image.getwidth(null);
int height = image.getheight(null);
bufferedimage bufferedimage = new bufferedimage(width, height, bufferedimage.type_int_rgb);
graphics2d g = bufferedimage.creategraphics();
g.drawimage(image, 0, 0, width, height, null);
g.setfont(new font(fontname, fontstyle, fontsize));
g.setcolor(color);
g.setcomposite(alphacomposite.getinstance(alphacomposite.src_atop, alpha));
int width_1 = fontsize * getlength(presstext);
int height_1 = fontsize;
int widthdiff = width - width_1;
int heightdiff = height - height_1;
if(x < 0){
x = widthdiff / 2;
}else if(x > widthdiff){
x = widthdiff;
}
if(y < 0){
y = heightdiff / 2;
}else if(y > heightdiff){
y = heightdiff;
}
g.drawstring(presstext, x, y + height_1);
g.dispose();
imageio.write(bufferedimage, pictrue_formate_jpg, file);
} catch (exception e) {
e.printstacktrace();
}
}
/**
* 获取字符长度，一个汉字作为 1 个字符, 一个英文字母作为 0.5 个字符
* @param text
* @return 字符长度，如：text="中国",返回 2；text="test",返回 2；text="中国abc",返回 4.
*/
public static int getlength(string text) {
int textlength = text.length();
int length = textlength;
for (int i = 0; i < textlength; i++) {
if (string.valueof(text.charat(i)).getbytes().length > 1) {
length++;
}
}
return (length % 2 == 0) ? length / 2 : length / 2 + 1;
}
/**
* 图片缩放
* @param filepath 图片路径
* @param height 高度
* @param width 宽度
* @param bb 比例不对时是否需要补白
*/
public static void resize(string filepath, int height, int width, boolean bb) {
try {
double ratio = 0; //缩放比例
file f = new file(filepath);
bufferedimage bi = imageio.read(f);
image itemp = bi.getscaledinstance(width, height, bufferedimage.scale_smooth);
//计算比例
if ((bi.getheight() > height) || (bi.getwidth() > width)) {
if (bi.getheight() > bi.getwidth()) {
ratio = (new integer(height)).doublevalue() / bi.getheight();
} else {
ratio = (new integer(width)).doublevalue() / bi.getwidth();
}
affinetransformop op = new affinetransformop(affinetransform.getscaleinstance(ratio, ratio), null);
itemp = op.filter(bi, null);
}
if (bb) {
bufferedimage image = new bufferedimage(width, height, bufferedimage.type_int_rgb);
graphics2d g = image.creategraphics();
g.setcolor(color.white);
g.fillrect(0, 0, width, height);
if (width == itemp.getwidth(null))
g.drawimage(itemp, 0, (height - itemp.getheight(null)) / 2, itemp.getwidth(null), itemp.getheight(null), color.white, null);
else
g.drawimage(itemp, (width - itemp.getwidth(null)) / 2, 0, itemp.getwidth(null), itemp.getheight(null), color.white, null);
g.dispose();
itemp = image;
}
imageio.write((bufferedimage) itemp, "jpg", f);
} catch (ioexception e) {
e.printstacktrace();
}
}
public static void main(string[] args) throws ioexception {
pressimage("c://pic//jpg", "c://pic//test.gif", 5000, 5000, 0f);
presstext("c://pic//jpg", "旺仔之印", "宋体", font.bold|font.italic, 20, color.black, 0, 0, 8f);
resize("c://pic//4.jpg", 1000, 500, true);
}
}
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