PHP如何使用ImagickDraw annotation()函数？代码示例

imagickdraw::annotation()函数是PHP中的内置函数, 用于在图像上绘制文本。

语法如下：

bool ImagickDraw::annotation( $x, $y, $text )

参数：此函数接受上述和以下描述的三个参数：

• $x：此参数用于保存要绘制文本的x坐标的值。
• $y：此参数用于保存要绘制文本的y坐标值。
• $text：此参数用于保存要在图像上绘制的字符串值。

返回值：该函数不返回值。

下面的程序说明了imagickdraw ::注释()PHP中的功能：

程序1：

<?php
  
// Create an ImagickDraw Object
$draw = new ImagickDraw();
  
// Set Fill Color 
$draw ->setFillColor( 'white' );
  
// Set FOnt Size
$draw ->setFontSize(20);
  
// Set Text
$draw ->annotation(5, 75, "lsbin!" );
$draw ->annotation(150, 75, "sarthak_ishu11" );
  
// Create new Imagick Object
$imagick = new Imagick();
$imagick ->newImage(300, 160, 'green' );
  
// Set Image Format
$imagick ->setImageFormat( "png" );
$imagick ->drawImage( $draw );
header( "Content-Type: image/png" );
  
// Display Image on Screen
echo $imagick ->getImageBlob();
?>

输出如下：

程式2：

<?php
  
// Create an ImagickDraw Object
$draw = new ImagickDraw();
  
// Set Stroke Opacity
$draw ->setStrokeOpacity(1);
  
// Set Stroke Color
$draw ->setStrokeColor( 'Black' );
  
// Set Fill Color
$draw ->setFillColor( 'Green' );
  
// Set Stroke Width
$draw ->setStrokeWidth(3);
  
// Define the points
$points = [
         [ 'x' => 40 * 5, 'y' => 10 * 5], [ 'x' => 20 * 5, 'y' => 20 * 5], [ 'x' => 70 * 5, 'y' => 50 * 5], [ 'x' => 40 * 5, 'y' => 10 * 5]
     ];
  
// Set the Font Size 
$draw ->setFontSize(50); 
    
// Set the font family 
$draw ->setFontFamily( 'Ubuntu-Mono' ); 
    
// Set the text to be added 
$draw ->annotation(30, 40, "lsbin" ); 
  
// Call Polyline Function
$draw ->polyline( $points );
  
// Create an Imagick Object
$image = new Imagick();
  
// Create new Image
$image ->newImage(500, 300, 'white' );
  
// Set Image Format
$image ->setImageFormat( "png" );
  
// Draw Image
$image ->drawImage( $draw );
  
header( "Content-Type: image/png" );
// Display the output image
echo $image ->getImageBlob();
?>

输出如下：

程式3：

<?php
//Create a new Imagick object
$imagick = new Imagick();
  
// Create a image on imagick object
$imagick ->newImage(800, 250, 'white' );
  
// Create a new ImagickDraw object
$draw = new ImagickDraw();
  
// Set the text properties
$draw ->setFontSize(110);
$draw ->setFillColor( 'green' );
  
// Apply the annotation() function
$draw ->annotation(20, 120, 'lsbin' );
  
// Set the text properties
$draw ->setFontSize(40);
$draw ->setFillColor( 'black' );
  
// Apply the annotation() function
$draw ->annotation(70, 200, 'A computer science portal for geeks' );
  
//  Render the draw commands in the ImagickDraw object
$imagick ->drawImage( $draw );
  
// Show the output
$imagick ->setImageFormat( "png" );
header( "Content-Type: image/png" );
echo $imagick ->getImageBlob();
?>

输出如下：

参考： http://php.net/manual/en/imagickdraw.annotation.php

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