Struct design_pattern_examples_rust::flyweight::flyweight_bigresource::BigResource

pub struct BigResource {
    data: Vec<Vec<char>>,
}

Represents a big image. This gets stored in the BigResourceManager struct.

This struct is used in rendering an image to a display using the render() function.

Fields

data: Vec<Vec<char>>

Implementations

impl BigResource

pub fn new(data: Vec<Vec<char>>) -> BigResource

Constructor.

Parameters

• data The “image” data to store as a “big” resource. This is a list of list of characters, where each list of characters represents a row of data, the number of lists of characters representing the height of the “image” data. We are using list of characters because Rust does not allow a string to be indexed for an individual character.

Returns

Returns the given data wrapped in a new BigResource instance.

pub fn render( &self, display: &mut Display, offset_x: usize, image_width: usize, image_height: usize, position_x: isize, position_y: isize )

Render the specified portion of the big resource into the given display at the given coordinates in the display.

Parameters

• display

  The display in which to render the image.

• offset_x

  Offset from left edge of big resource “image” to start of the Flyweight image to render.

• image_width

  Width of the Flyweight “image” to render, in characters.

• image_height

  Height of the Flyweight “image” to render, in characters.

• position_x

  Horizontal position, in characters, within the Display to which to render the upper left corner of the Flyweight image. Can be negative if the Flyweight image is partially off the left edge of the display.

• position_y

  Vertical position, in characters, within the Display to which to render the upper left corner of the Flyweight image. Can be negative if the Flyweight image is partially off the top edge of the display.