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Black Ram edited this page Jan 2, 2025 · 20 revisions

Tickers (primitive animations and effects)

Pixi’VN provides the possibility to animate the canvas components with the Tickers (primitive animations and effects).

The Tickers, compared to PixiJS.tickers, are a class with a fn method that is executed on each frame. This method is used to animate the canvas components. Pixi’VN keeps track of all running Tickers, detects when they are no longer used and allows you to pause, resume, and delete them with various methods.

Pixi’VN provides various primitive Tickers, that can be used to perform basic actions. For example, the MoveTicker class is primitive animation that can be used to move a canvas component. They are classes that extend the Ticker.

Move

For moving a canvas component in (x, y) direction you can use the MoveTicker class. This Ticker will edit the x and y properties to reach the destination.

MoveTicker have a constructor that takes the a object with the following properties:

  • destination: is an object that contains the destination of the movement. It has the following properties:
    • x: is a number that represents the destination in the x direction.
    • y: is a number that represents the destination in the y direction.
    • type (Optional): is a string that represents the type of the destination. Possible values are pixel, percentage and align:
      • pixel: The destination is in pixel.
      • percentage: The destination is in percentage.
      • align: The destination is in align. default is pixel.
  • speed (Optional): is a number that represents the speed of the movement.
  • speedProgression (Optional): in case the movement needs to increase/decrease in speed over time, this property can be used. You can read more about it here.
  • startOnlyIfHaveTexture (Optional): is a boolean that represents if the animation should start only if the canvas component have a texture not empty. If true and the canvas component not have a texture, the animation will not edit the x and y properties, but will be executed. You can read more about it here.
  • aliasToRemoveAfter (Optional): is a string[] that contains the aliases of the canvas component that will be removed after the movement. You can read more about it here.
  • tickerAliasToResume (Optional): in case you want to continue some tickers that were previously paused, you can pass the aliases of the canvas components that have the tickers to be resumed. You can read more about it here.

:::tabs == startLabel.ts

import { canvas, MoveTicker, newLabel, Repeat, showImage } from "@drincs/pixi-vn";

export const startLabel = newLabel("start_label", [
    async () => {
        await showImage("alien");
        canvas.addTickersSteps("alien", [
            new MoveTicker({ // [!code focus]
                destination: { x: 1, y: 0, type: "align" }, // [!code focus]
            }), // [!code focus]
            new MoveTicker({ // [!code focus]
                destination: { x: 1, y: 1, type: "align" }, // [!code focus]
                speed: 50, // [!code focus]
            }), // [!code focus]
            new MoveTicker({ // [!code focus]
                destination: { x: 0, y: 0, type: "align" }, // [!code focus]
                speed: 20, // [!code focus]
            }), // [!code focus]
            Repeat,
        ]);
    }
]);

== assets-utility.ts

import { Assets } from "@drincs/pixi-vn";

export async function defineAssets() {
    Assets.add({ alias: "alien", src: "https://pixijs.com/assets/eggHead.png" });
}

:::

::: sandbox {template=vl986g entry=/src/labels/startLabel.ts,/src/utils/assets-utility.ts} :::

Rotate

For rotating a canvas component you can use the RotateTicker class. This Ticker will edit the rotation property to rotate the canvas component.

RotateTicker have a constructor that takes the a object with the following properties:

  • speed (Optional): is a number that represents the speed of the rotation.
  • clockwise (Optional): is a boolean that represents the direction of the rotation. If true, the rotation will be clockwise, otherwise it will be counterclockwise.
  • speedProgression (Optional): in case the rotation needs to increase/decrease in speed over time, this property can be used. You can read more about it here.
  • startOnlyIfHaveTexture (Optional): is a boolean that represents if the animation should start only if the canvas component have a texture not empty. If true and the canvas component not have a texture, the animation will not edit the rotation property, but will be executed. You can read more about it here.
  • aliasToRemoveAfter (Optional): is a string[] that contains the aliases of the canvas component that will be removed after the movement. You can read more about it here.
  • tickerAliasToResume (Optional): in case you want to continue some tickers that were previously paused, you can pass the aliases of the canvas components that have the tickers to be resumed. You can read more about it here.

:::tabs == startLabel.ts

import { canvas, newLabel, Repeat, RotateTicker, showImage } from "@drincs/pixi-vn";

export const startLabel = newLabel("start_label", [
    async () => {
        await showImage("alien", "alien", { align: 0.5, anchor: 0.5 });
        canvas.addTickersSteps("alien", [
            new RotateTicker({}, 2), // [!code focus]
            new RotateTicker({ // [!code focus]
                clockwise: false, // [!code focus]
                speed: 10, // [!code focus]
            }, 3), // [!code focus]
            Repeat,
        ]);
    },
]);

== assets-utility.ts

import { Assets } from "@drincs/pixi-vn";

export async function defineAssets() {
    Assets.add({ alias: "alien", src: "https://pixijs.com/assets/eggHead.png" });
}

:::

::: sandbox {template=6zc9js entry=/src/labels/startLabel.ts,/src/utils/assets-utility.ts} :::

Fade

For fading a canvas component you can use the FadeAlphaTicker class. This Ticker will edit the alpha property of the canvas component to fade in/out.

FadeAlphaTicker have a constructor that takes the a object with the following properties:

Special properties

Speed progression property

Start only if have texture property

Alias to remove after property

Ticker alias to resume property

Create a Ticker

In Pixi.js, you can add a Ticker by passing a lambda as a parameter that will be executed on each frame.

In Pixi’VN, you must create a class tha extends TickerBase, add a decorator @tickerDecorator to the class and override the fn method.

@tickerDecorator is a decorator that save the ticker in memory. It have a optional parameter that is the id of the ticker (must be unique). If you don't pass the id, the ticker will be saved with the class name. ( How enable the decorators in TypeScript? )

@tickerDecorator() // or @tickerDecorator('RotateTicker')
export default class RotateTicker extends TickerBase<{ speed?: number, clockwise?: boolean }> {
    override fn(
        t: Ticker,
        args: {
            speed?: number,
            clockwise?: boolean,
        },
        aliases: string[]
    ): void {
        let speed = args.speed === undefined ? 0.1 : args.speed
        let clockwise = args.clockwise === undefined ? true : args.clockwise
        aliases.forEach((alias) => {
            let component = canvas.find(alias)
            if (component && component instanceof Container) {
                if (clockwise)
                    component.rotation += speed * t.deltaTime
                else
                    component.rotation -= speed * t.deltaTime
            }
        })
    }
}
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