PHP gd imageline How to use AH?

Source: Internet
Author: User
Four coordinates of the imageline I don't understand the official documents, and I don't understand. Ask the great God to tell you

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Four coordinates of the imageline I don't understand the official documents, and I don't understand. Ask the great God to tell you

Landlord you have not learned the axis?

Two points of the axis, linked together is a straight line, the coordinates of the two points are an x y coordinate, respectively, representing the horizontal and vertical position, two points, add up is 4 coordinates

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