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Official ZPE Programming Environment documentationZPEImage

Introduction

ZPE 1.6.4 (August 2018) completely redesigns the manner in which images are used in ZPE. Instead of defining them as a native type within the language and runtime environment images are now simply encapsulated within ZPEObjects.

What this allows for is more precise and concise syntaxes and a more object oriented way of handling them. The 'image object syntax' as it is now known helps handle this better.

The following guide shows the core functionalities of the image object, better known by it's internal name as the ZPEImage.

ZPEImage object functions

The following is a list of internal functions the ZPEImage object exposes. All functions are ZPEObjectNativeFunctions unless specified therefore run in native code.

new_image (integer width, integer height) ⇒ object
Creates a new image and stores it within the object.
open (string file) ⇒ object
Opens an image from a specified file and puts in to the current object. The image can then be manipulated using the language functionalities. It will return false if the file could not be found.
save (string file) ⇒ object
Saves the image to a file path, file. The format is decided based on the extension.
transform_greyscale () ⇒ object
Transforms the image with the greyscale filter.
image_transform_sepia () ⇒ object
Transforms the image with the sepia filter.
transform_invert_colour () ⇒ object
Transforms the image with the inverted colour filter.
transform_resize (integer width, integer height) ⇒ object
Resizes the image to the specified width and height parameters.
transform_rotate (integer degrees) ⇒ object
Takes in an image and rotates the image to the specified degrees.
get_width () ⇒ object
Returns the width dimension of the image.
image_get_height () ⇒ object
Returns the height dimension of the image.
get_pixel (integer x_coordinate, integer y_coordinate, [boolean associative]) ⇒ list
Returns a list which contains information about a single pixel. The list will contain the red (r), green (g), blue (b) and alpha data. If the associative variable is given a true value, the array will instead become an associative array: {r => red_value, g => green_value, b => blue_value, a => alpha_value}.
image_set_pixel (integer x_coordinate, integer y_coordinate, list color) ⇒ object
This function sets a pixel in the image. If the set pixel operation fails, it returns the boolean value false. If the set pixel operation succeeds, it return the image. Any operation should be prepared for failure.
base64_encode () ⇒ string
Return a base64 encoding of the image.
Added in 1.7.8
screen_grab () ⇒ object
Captures the screen of the computer at the point when the command is issued and stores it within the current image object.
display () ⇒ object
Displays the image.

Prior to version 1.7.4

Prior to version 1.7.4 the built-in generate_image function was used to create an image object. The function was a simple one - it's job was to create an image object with an image of some specified parameters. This image is a simple placeholder or can be used for drawing on to (future versions).

An image is generated using the functions described on the generate_image function page.

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