Nodejs GM drawLine()函数用法介绍 _NodejsdrawLine

【Nodejs GM drawLine()函数用法介绍】drawLine()函数是GraphicsMagick库中的内置函数, 用于绘制具有指定坐标的线。成功时该函数返回真实值。
语法如下：

drawLine( x0, y0, x1, y1 )

参数：该函数接受上述和以下所述的四个参数：

x0：此参数存储初始点的x坐标值。
y0：此参数存储初始点的y坐标值。
x1：此参数存储最终点的x坐标值。
y1：此参数存储终点的y坐标值。

返回值：此函数返回GraphicsMagick对象。
原始图片：

示例1：

//Include gm library var gm = require( 'gm' ).subClass({imageMagick: true }); //Import the image gm( '1.png' )//Set the color for the stroke .stroke( "#000000" , 20)//Invoke drawLine function with x0 as 100, //y0 as 45, x1 as 100, y1 as 89, r0 as 50 //and r1 as 40 .drawLine(100, 30, 400, 80)//Process and write the image .write( "drawLine1.png" , function (err) { if (!err) console.log( 'done' ); });

输出如下：

示例2：

//Include gm library var gm = require( 'gm' ); //Import the image gm(600, 300, 'white' )//set the color for the stroke .stroke( "green" , 3)//Set the font .font( "Helvetica.ttf" , 60)//Invoke drawLine function with //x0 as 100, y0 as 45, x1 as 100, //y1 as 200 .drawLine(100, 45, 100, 200)//Invoke drawLine function with //x0 as 100, y0 as 45, x1 as 500, //y1 as 45 .drawLine(100, 45, 500, 45)//Invoke drawLine function with //x0 as 500, y0 as 45, x1 as 500, //y1 as 200 .drawLine(500, 45, 500, 200)//Call to drawText Function .drawText(100, 280, "lsbin!" )//Process and write the image .write( "drawLine1.png" , function (err) { if (!err) console.log( 'done' ); });

输出如下：

参考：