Queued Animated Sprites Macroquad

The queued_animated_sprites_macroquad Rust crate offers an easy interface for animated sprite drawing focused around a queue-based design. It is built on top of macroquad and provides flexibility with its animation effect system that enhances how your sprites are drawn with little extra work.

Features

• Easy creation and management of sprite animations

• Support for multiple animations per sprite stored using a generic key type to trivially fit into your project (ex. use your own enum keys)

• Serialization for easy saving and loading of sprite states

• A queue based system, where animations automatically chain back-to-back based on duration, providing a great interface for advanced animation combining

• A well rounded animation effect system, which enables applying unique effects to your sprites with just an extra line or two (fade in/out, slide in/out, spin, pulse, etc.)

• Optional custom effects (crate feature), which allows anyone to implement their own new effects to use instantly

Built-in Effects

The library provides a number of built-in effects such as:

• Blinking(EffectColor, u32): Make the sprite blink with the specified color and number of blinks (used for damage or low health effects)
• FadeIn and FadeOut: Gradually changes the opacity of the sprite.
• SlideIn(SlideDirection) and SlideOut(SlideDirection): Move the sprite in or out of the screen.
• Pulse(f32): Scale the sprite up and down, centered on its origin. The f32 parameter determines the maximum scale factor.
• Shake(f32): Apply a shaking effect to the sprite. The f32 parameter determines the intensity of the shake.
• Wobble(f32): Apply a wobbling effect to the sprite. The f32 parameter determines the intensity of the wobble.
• Bounce(f32, u32): Make the sprite bounce. The f32 parameter determines the height of the bounce, and the u32 parameter specifies the number of bounces.
• BasicFlip(FlipDirection): Flip the sprite either horizontally or vertically.
• Spin: Rotates the sprite.
• Glitch(f32): Apply a glitch effect to the sprite. The f32 parameter determines the intensity of the glitch.
• ShearLeft(f32) and ShearRight(f32): Apply a shearing effect to the sprite. The f32 parameter determines the intensity of the shear.
• SquashFlipVertical(f32) and SquashFlipVertical(f32): Squash + flip the sprite either vertically or horizontally. The f32 parameter determines the intensity of the squash.
• ColorCycle(Vec): Cycle through a palette of colors.

Basic Usage

At the core of the library is the AnimatedSprite struct where the majority of functionality in this library takes place.

Here's a quick example of how to create and use an animated sprite:

use queued_animated_sprites_macroquad::{AnimatedSprite, Animation, AnimationEffect, SlideFrom};
use macroquad::prelude::*;

#[macroquad::main("Queued Animated Sprites Demo")]
async fn main() {
    // Load the spritesheet
    let texture = Texture2D::from_file_with_format(
        include_bytes!("slime.png"),
        None
    );

    // Create the animated sprite
    let mut slime = AnimatedSprite::new(
        32.0,  // Width of each sprite on the spritesheet
        32.0,  // Height of each sprite on the spritesheet
        "idle", // Default key you want to have for your default animation
        Animation::new(0, 4, 6)  // Default animation, uses the first row on the spritesheet, with 4 sprites on the row, running at 6fps
    );

    // Add an attack animation
    slime.register_animation(
        "attack",
        Animation::new(1, 6, 12)  // Targets spritesheet's first row (1), takes the first 6 frames on the row, plays them at 12 fps
    );

    // Using the added attack animation, queue it up and set its duration for 1.5 seconds
    slime.add_animation_to_queue("attack", 1.5);

    loop {
        clear_background(WHITE);

        // Update and draw the sprite
        slime.update();
        slime.draw_animation(&texture, 400.0, 300.0, WHITE); // spritesheet texture, x, y, color

        next_frame().await
    }
}

This example creates a slime sprite with an idle animation and an attack animation. The sprite performs the attack animation for 1.5 seconds before returning to idle (default animation).

Animation Effects

This library includes a built-in animation effects system which can be applied to your sprites. These allow you to perform things like have a slime monster fade in while spawning, have your sprites slide off the screen when moving in/out of a battle, have a UI element pulse when it needs to be seen, and more.

Here's an example of how to use animation effects:

use queued_animated_sprites_macroquad::{AnimatedSprite, Animation, AnimationEffect, SlideFrom};

// ... (previous setup code)

// Add a spawn animation with fade-in effects
slime.register_animation(
    "spawn",
    Animation::new(2, 4, 8)  // row 2, 4 frames, 8 fps
        .with_start_effect(AnimationEffect::FadeIn, 1) // fade in effect has a duration of 1s from the start of the spawn animation
);

// Add a despawn animation with fade-out
slime.register_animation(
    "despawn",
    Animation::new(3, 4, 8)  // row 3, 4 frames, 8 fps
        .with_end_effect(AnimationEffect::FadeOut, 0.5) // fade out effect has a duration starting 0.5s before the end of the despawn animation
);

// Queue the spawn animation which will play for 1 second
slime.add_animation_to_queue("spawn", 1.0);

In this example, we've added a "spawn" animation that fades in, and a "despawn" animation that fades out. Of note, you can use Animation::empty() to have the sprite skip drawing entirely. This means it's possible to set empty as the default (useful for visual effects or otherwise that are triggered at specific moments), or be added into the queue to stop drawing the sprite temporarily.

Custom Effects (Optional Feature)

For more advanced use cases, queued_animated_sprites_macroquad also supports custom animation effects. This is an optional feature that can be enabled in your Cargo.toml:

[dependencies]
queued_animated_sprites_macroquad = { version = "0.1.0", features = ["custom_effects"] }

Custom effects allow you to define your own effect behaviors by specifying a single function. The one tradeoff is that custom effects are not serializable (thus less plug-and-play), so this is an optional feature for advanced users.

Here's an example of creating and using a custom "color cycle" effect:

use queued_animated_sprites_macroquad::{AnimatedSprite, Animation, AnimationEffect};
use macroquad::prelude::*;

// Define the color cycle effect
fn color_cycle_effect(
    progress: f32,
    color: &mut Color,
    _params: &mut DrawTextureParams,
    _x_pos: &mut f32,
    _y_pos: &mut f32,
    _tile_width: f32,
    _tile_height: f32,
) {
    color.r = (progress * std::f32::consts::PI * 2.0).sin() * 0.5 + 0.5;
    color.g = (progress * std::f32::consts::PI * 2.0 + 2.0).sin() * 0.5 + 0.5;
    color.b = (progress * std::f32::consts::PI * 2.0 + 4.0).sin() * 0.5 + 0.5;
}

// ... (previous setup code)

// Add an idle animation with the color cycle effect
let color_cycle_animation = Animation::new(0, 4, 6)
    .with_start_effect(AnimationEffect::new_custom(color_cycle_effect), 2.0);

slime.register_animation("idle_color_cycle", color_cycle_animation);

// Queue the color cycling idle animation, which will play for 3.0 seconds
slime.add_animation_to_queue("idle_color_cycle", 3.0);

This example creates a custom color cycle effect that changes the color of the sprite over time. The effect is applied to an "idle_color_cycle" animation that lasts for 3 seconds.

License

This project is licensed under the MIT License. See the LICENSE file for details.