generated from incremental-social/The-Modding-Tree
63 lines
3.6 KiB
Markdown
63 lines
3.6 KiB
Markdown
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# Particles
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Particles are free-floating elements that can move and have many different behaviors. They can also interact with the mouse.
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To make particles, use `makeParticles(particle, amount)`. `particle` is a particle-defining object, with features as explained below. There is also `makeShinies`, which uses different defaults and creates stationary particles at a random location. There are also a few other useful things listed at the end.
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```js
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const myParticle {
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image:"options_wheel.png",
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spread: 20,
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gravity: 2,
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time: 3,
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speed() { // Randomize speed a bit
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return (Math.random() + 1.2) * 8
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},
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etc...
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}
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```
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Features can be functions or constant. These features will be called when each particle is made, with an `id` argument, which is assigned based on which of the `amount` particles being spawned this is. **All of these are optional**, with a default value.
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All distances are in pixels and angles are in degrees, with 0 being up and going clockwise.
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- time: The amount of time, in seconds, that the particle will last. Default is 3.
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- fadeOutTime: The amount of seconds that fading out at the end should take (part of the total lifetime). Default is 1.
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- fadeInTime: The amount of seconds that fading in should take (part of the total lifetime). Default is 0.
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- image: The image the particle should display. `""` will display no image. Default is a generic particle.
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- text: Displays text on the particle. Can use basic HTML.
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- style: Lets you apply other CSS styling to the particle.
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- width, height: The dimensions of the particle. Default is 35 and 35.
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- color: Sets the color of the image to this color.
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- angle: The angle that the particle should face. Default is 0.
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- dir: The initial angle that the particles should move in, before spread is factored in. Default is whatever angle is.
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- spread: If there are several particles, they will be spread out by this many degrees, centered on dir. Default is 30.
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- rotation: The amount that the (visual) angle of the particle should change by. Default is 0.
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- speed: The starting speed of the particle. Default is 15.
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- gravity: The amount the particle should accelerate downwards. Default is 0.
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- x, y: The starting coordinates of the particle. Default is at the mouse position.
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- offset: How far from the start each particle should appear. Default is 10.
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- xVel, yVel: Set initially based on other properties, then used to update movement.
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- layer: When changing tabs, if leaving the `layer` tab, this particle will be erased.
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- You can add other features to particles, but you must impliment their effects yourself.
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Function features: These stay as functions and are for more advanced things. They are optional.
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- update(): Called each tick. Lets you do more advanced visual and movement behaviors by changing other properties.
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- onClick(), onMouseOver(), onMouseLeave(): Called when the particle is interacted with.
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Other useful things that are not features of the particle object:
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- setDir(particle, dir), setSpeed(particle, speed): Set the speed/direction on a particle.
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- clearParticles(check): Function to delete particles. With no check, it deletes all particles. Check is a function that takes a particle, and returns true if that particle should be deleted.
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- You can use Vue.delete(particles, this.id) to make a particle delete itself.
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- mouseX and mouseY are variables that track the mouse position.
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- sin(x), cos(x), tan(x): functions that do these operations, with x in degrees. (Instead of radians).
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- asin(x), acos(x), atan(x): functions that do these operations, with the returned value in degrees. (instead of radians).
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