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This article mainly introduces "how to draw polygons, arcs and ellipses in PHP". In daily operation, I believe many people have doubts about how to draw polygons, arcs and ellipses in PHP. The editor consulted all kinds of data and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "how to draw polygons, arcs and ellipses in PHP". Next, please follow the editor to study!

After the previous article described, PHP drawing basic graphics have been understood, including how to draw rectangles, since rectangles can be drawn, then triangles, Pentagon should be how to draw? So let's take a look at how polygons should be drawn in PHP.

Draw polygon

Similar to drawing a rectangle, there are two functions for drawing polygons, the imagepolygon () function and the imagefilledpolygon () function, which have the following syntax format:

Imagepolygon (resource $image, array $points, int $num_points, int $color) imagefilledpolygon (resource $image, array $points, int $num_points, int $color)

The reason why it is similar to the two functions of a rectangle is that the color after the imagepolygon () function is the color that draws the edges of the polygon, and the color after the imagefilledpolygon () function is the color that draws the interior fill of the polygon.

In syntax, $image represents the canvas; $points is an array; and the third parameter, $num_points, is used to set the number of vertices of the polygon, which must be greater than 3.

Examples are as follows:

Output result:

Draw an ellipse

In PHP, you can draw an ellipse through the imageellipse () function, similar to drawing a polygon, you can also use the imagefilledellipse () function to draw an ellipse and fill it. Their grammatical format is as follows:

Imageellipse (resource $image, int $x, int $y, int $width, int $height, int $color) imagefilledellipse (resource $image, int $x, int $y, int $width, int $height, int $color)

Where $x and $y represent the horizontal and vertical coordinates of the center of the ellipse, $width and $height represent the width and height of the ellipse, and the following $colorb represents the edge color and fill color of the ellipse, respectively.

Examples are as follows:

Output result:

Draw an arc

In PHP, you can draw an arc or circle through the imagearc () function and the imagefilledarc () function. The difference is that the color of the arc drawn by the imagearc () function is the edge color, while the arc drawn by the imagefilledarc () function will be filled. Their grammatical format is as follows:

Imagearc (resource $image, int $x, int $y, int $width, int $height, int $start, int $end, int $color) imagefilledarc (resource $image, int $x, int $y, int $width, int $height, int $start, int $end, int $color, int $style)

Where $x and $y are represented by the horizontal and vertical coordinates of the center point of the arc, $width and $height are represented by the width and height of the arc, respectively, and $start and $end represent the start and end angles of the arc, respectively.

It is also important to note that the imagefilledarc () function has an extra $style parameter than the imagearc () function, which is used to set the fill type of the color. It has the following types:

IMG_ARC_PIE: normal fill, resulting in a circular boundary

IMG_ARC_CHORD: only use a straight line to connect the start point and the end point. Note that it is mutually exclusive with IMG_ARC_PIE

IMG_ARC_NOFILL: indicates that an arc or chord has only an outline and no filling

IMG_ARC_EDGED: connect the start and end points to the center point with a straight line.

Examples are as follows:

Output result:

At this point, the study on "how to draw polygons, arcs and ellipses in PHP" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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