zoukankan      html  css  js  c++  java
  • 添加文字和水印

    1.加文字

    -(UIImage *)addText:(UIImage *)img text:(NSString *)text1
    {
        //get image width and height
        int w = img.size.width;
        int h = img.size.height;
        CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
        //create a graphic context with CGBitmapContextCreate
        CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);
        CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
        CGContextSetRGBFillColor(context, 0.0, 1.0, 1.0, 1);
        char* text = (char *)[text1 cStringUsingEncoding:NSASCIIStringEncoding];
        CGContextSelectFont(context, "Georgia", 30, kCGEncodingMacRoman);
        CGContextSetTextDrawingMode(context, kCGTextFill);
        CGContextSetRGBFillColor(context, 255, 0, 0, 1);
        CGContextShowTextAtPoint(context, w/2-strlen(text)*5, h/2, text, strlen(text));
        //Create image ref from the context
        CGImageRef imageMasked = CGBitmapContextCreateImage(context);
        CGContextRelease(context);
        CGColorSpaceRelease(colorSpace);
        return [UIImage imageWithCGImage:imageMasked];
    }

    2.加图片
    -(UIImage *)addImageLogo:(UIImage *)img text:(UIImage *)logo
    {
        //get image width and height
        int w = img.size.width;
        int h = img.size.height;
        int logoWidth = logo.size.width;
        int logoHeight = logo.size.height;
        CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
        //create a graphic context with CGBitmapContextCreate
        CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);
        CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
        CGContextDrawImage(context, CGRectMake(w-logoWidth, 0, logoWidth, logoHeight), [logo CGImage]);
        CGImageRef imageMasked = CGBitmapContextCreateImage(context);
        CGContextRelease(context);
        CGColorSpaceRelease(colorSpace);
        return [UIImage imageWithCGImage:imageMasked];
        //  CGContextDrawImage(contextRef, CGRectMake(100, 50, 200, 80), [smallImg CGImage]);
    }

    3.加半透明的水印
    - (UIImage *)addImage:(UIImage *)useImage addImage1:(UIImage *)addImage1
    {
        UIGraphicsBeginImageContext(useImage.size);
        [useImage drawInRect:CGRectMake(0, 0, useImage.size.width, useImage.size.height)];
        [addImage1 drawInRect:CGRectMake(0, useImage.size.height-addImage1.size.height, addImage1.size.width, addImage1.size.height)];
        UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        return resultingImage;
    }
  • 相关阅读:
    2021上半年下午第二题
    21年软件设计师上半年下午试题一
    软考下午第三题-用例图和类图
    类图
    用例图-包含、扩展、泛化
    软考下午题二------数据库设计
    软件设计师下午题-数据流图
    IP练习题
    2020软件工程作业02
    2020软件工程作业01
  • 原文地址:https://www.cnblogs.com/tian-sun/p/5019901.html
Copyright © 2011-2022 走看看