57 lines
1.7 KiB
Go
57 lines
1.7 KiB
Go
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package main
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import (
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"math/rand"
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"time"
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rl "github.com/gen2brain/raylib-go/raylib"
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)
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type Particle struct {
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Pos rl.Vector2
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Vel rl.Vector2
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Size float32
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}
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var particles []Particle
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var topColor = rl.Color{R: 0x20, G: 0x0F, B: 0x3C, A: 0xFF} // #200F3C top
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var bottomColor = rl.Color{R: 0x3B, G: 0x0B, B: 0x42, A: 0xFF} // #3B0B42 bottom
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var particleColor = rl.Color{R: 0xD4, G: 0xB0, B: 0xB5, A: 0x80} // D4B0B5 with some transparency
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func InitBackground(width, height int) {
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rand.Seed(time.Now().UnixNano())
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particles = make([]Particle, 100)
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for i := range particles {
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particles[i].Pos = rl.Vector2{X: float32(rand.Intn(width)), Y: float32(rand.Intn(height))}
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particles[i].Vel = rl.Vector2{X: (rand.Float32() - 0.5) * 0.2, Y: (rand.Float32() - 0.5) * 0.2}
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particles[i].Size = rand.Float32()*1.5 + 0.5 // Particles size ~0.5-2.0
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}
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}
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func UpdateBackground(screenWidth, screenHeight int) {
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for i := range particles {
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particles[i].Pos.X += particles[i].Vel.X
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particles[i].Pos.Y += particles[i].Vel.Y
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// Wrap around screen
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if particles[i].Pos.X < 0 {
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particles[i].Pos.X += float32(screenWidth)
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} else if particles[i].Pos.X > float32(screenWidth) {
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particles[i].Pos.X -= float32(screenWidth)
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}
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if particles[i].Pos.Y < 0 {
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particles[i].Pos.Y += float32(screenHeight)
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} else if particles[i].Pos.Y > float32(screenHeight) {
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particles[i].Pos.Y -= float32(screenHeight)
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}
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}
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}
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func DrawBackground(screenWidth, screenHeight int) {
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// Draw vertical gradient
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rl.DrawRectangleGradientV(0, 0, int32(screenWidth), int32(screenHeight), topColor, bottomColor)
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// Draw particles
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for _, p := range particles {
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rl.DrawCircleV(p.Pos, p.Size, particleColor)
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}
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}
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