Cross-platform image decoder(png/jpeg/gif) and encoder(png/jpeg) for Node.js
Node.js轻量级跨平台图像编解码库
var images = require("images");
images("input.jpg")
.size(400)
.draw(images("logo.png"), 10, 10)
.save("output.jpg", {
quality : 50
});
Features 功能特性
- Lightweight:no need to install any image processing library.
- 轻量级:无需安装任何图像处理库。
- Cross-platform: Released a compiled .node file on windows, just download and start.
- 跨平台:Windows下发布了编译好的.node文件,下载就能用。
- Easy-to-use: Provide jQuery-like chaining API.Simple and reliable!
- 方便用:jQuery风格的API,简单可依赖。
Installation 安装
$ npm install images
You will also need to install:
- giflib 4.x.x
- libpng 1.5.x
- jpeg-turbo 1.x.x
API 接口
node-images provide jQuery-like Chaining API,You can start the chain like this:
node-images 提供了类似jQuery的链式调用API,您可以这样开始:
images(file)
images(width, height)
images(buffer[, start[, end]])
images(image[, x, y, width, height])
images(file)
Load and decode image from file
从指定文件加载并解码图像
images(width, height)
Create a new transparent image
创建一个指定宽高的透明图像
images(buffer[, start[, end]])
Load and decode image from a buffer
从Buffer数据中解码图像
images(image[, x, y, width, height])
Copy from another image
从另一个图像中复制区域来创建图像
.fill(red, green, blue[, alpha])
eg:images(200, 100).fill(0xff, 0x00, 0x00, 0.5)
Fill image with color
以指定颜色填充图像
.draw(image, x, y)
Draw image on the current image position( x , y )
在当前图像( x , y )上绘制 image 图像
.encode(type[, config])
eg:images("input.png").encode("jpg", {operation:50})
Encode image to buffer, config is image setting.
以指定格式编码当前图像到Buffer,config为图片设置,目前支持设置JPG图像质量
Return buffer
返回填充好的Buffer
Note:The operation will cut off the chain
注意:该操作将会切断调用链
See:.save(file[, type[, config]])
参考:.save(file[, type[, config]])
.save(file[, type[, config]])
eg:images("input.png").encode("output.jpg", {operation:50})
Encoding and save the current image to a file, if the type is not specified, type well be automatically determined according to the file, config is image setting. eg: { operation:50 }
编码并保存当前图像到 file ,如果type未指定,则根据 file 自动判断文件类型,config为图片设置,目前支持设置JPG图像质量
.size([width[, height]])
Get size of the image or set the size of the image,if the height is not specified, then scaling based on the current width and height
获取或者设置图像宽高,如果height未指定,则根据当前宽高等比缩放
.width([width])
Get width for the image or set width of the image
获取或设置图像宽度
.height([height])
Get height for the image or set height of the image
获取或设置图像高度
images.setLimit(width, height)
Set the limit size of each image
设置库处理图片的大小限制,设置后对所有新的操作生效(如果超限则抛出异常)。