php绘制圆形的二个例子php绘图函数imagearc()、ImagePng()的用法

2. header ("Content-type: image/png");
4. $im = ImageCreate (150, 150);
5. $grey = ImageColorAllocate ($im, 230, 230, 230);
6. $black = ImageColorAllocate ($im, 0, 0, 0);
8. ImageString($im, 3, 5, 5, "Figure 18.5: Circle", $black);
9. ImageArc($im, 75, 75, 50, 50, 0, 360, $black);
10. ImagePng ($im);
11. ImageDestroy ($im);
12. ?>

例2，绘制圆形 Drawing a Circle with imagearc()

2. header("Content-type: image/png");
3. $image = imagecreate( 200, 200 );
4. $red = imagecolorallocate($image, 255,0,0);
5. $blue = imagecolorallocate($image, 0,0,255 );
6. imagearc( $image, 99, 99, 180, 180, 0, 360, $blue );
7. imagefill( $image, 99, 99, $blue );
8. imagepng($image);
9. ?>