37 lines
782 B
V
37 lines
782 B
V
module objects
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import gg
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import gx
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pub struct Particle {
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pub mut:
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color gx.Color
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pos Vector
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vel Vector
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accel Vector
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lifespan f32 = 255
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}
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pub fn (particle Particle) draw(mut ctx gg.Context) {
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ctx.draw_circle_filled(particle.pos.x, get_params().height - particle.pos.y, get_params().particle_radius,
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particle.color)
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}
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pub fn (mut particle Particle) tick(mut rocket Rocket, mut ctx gg.Context) {
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particle.lifespan -= get_params().age_rate
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particle.color.a = byte(particle.lifespan)
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if particle.lifespan <= 0 {
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rocket.dead = true
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return
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}
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particle.accel += get_params().gravity
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particle.vel += particle.accel
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particle.vel = particle.vel.mult(get_params().drag)
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particle.pos += particle.vel
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particle.draw(mut ctx)
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particle.accel = Vector{}
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}
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