From aa2bd3fbfd219d33844beae63a4546a50148c1bc Mon Sep 17 00:00:00 2001
From: silva guimaraes <silva__guimaraes@hotmail.com>
Date: Sat, 22 Jul 2023 16:58:46 -0300
Subject: [PATCH] commit inicial

---
 go.mod  |   5 ++
 go.sum  |   2 +
 main.go | 189 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 196 insertions(+)
 create mode 100644 go.mod
 create mode 100644 go.sum
 create mode 100644 main.go

diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..4a29b8c
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,5 @@
+module danmaku
+
+go 1.20
+
+require github.com/gen2brain/raylib-go/raylib v0.0.0-20230719211022-1083eace2049
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..5f40ca5
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+github.com/gen2brain/raylib-go/raylib v0.0.0-20230719211022-1083eace2049 h1:fJeDPYJDyT+KeWKsIMbRlNcSgsQ2nZ4bJLwBraVA/xU=
+github.com/gen2brain/raylib-go/raylib v0.0.0-20230719211022-1083eace2049/go.mod h1:AwtGA3aTtYdezNxEVbfchaLw/z+CuRDh2Mlxy0FbBro=
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..11ca361
--- /dev/null
+++ b/main.go
@@ -0,0 +1,189 @@
+package main
+
+import (
+	"fmt"
+
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+type movementPattern int
+type shootingPattern int
+
+const (
+    horizontal movementPattern = iota
+    circular movementPattern = iota
+)
+
+type game struct {
+    screenWidth int32
+    screenHeight int32
+    time int
+    enemies []*enemy
+    bullets []*bullet
+}
+
+type bullet struct {
+    pos rl.Vector2
+    speed rl.Vector2
+    size float32
+    dmg int
+    enemy bool
+}
+
+type player struct {
+    pos rl.Vector2
+    moveSpeed float32
+    bulletMoveSpeed float32
+}
+
+type enemy struct {
+    pos rl.Vector2
+    health int
+    movePattern movementPattern
+    shootPattern shootingPattern
+}
+
+func (g game) insideArena(v rl.Vector2) bool {
+    return v.X >= 0 && v.Y >= 0 && 
+    v.Y <= float32(g.screenHeight) && v.X <= float32(g.screenWidth)
+}
+
+func (b *bullet) update(g *game, index int) {
+    b.pos = rl.Vector2Add(b.pos, b.speed)
+
+    if !g.insideArena(b.pos) {
+        g.bullets[index] = g.bullets[len(g.bullets)-1]
+        g.bullets = g.bullets[:len(g.bullets)-1]
+        return
+    }
+
+    rl.DrawCircleV(b.pos, b.size, rl.Yellow)
+}
+
+func (e *enemy) shoot(g *game) {
+    if g.time % 15 != 0 {
+        return
+    }
+
+    g.bullets = append(g.bullets, &bullet{
+        speed: rl.Vector2{X: 0, Y: 10},
+        size: 4,
+        dmg: 1,
+        enemy: true,
+        pos: e.pos,
+    })
+}
+
+func (e *enemy) update(g *game) {
+    rl.DrawCircleV(e.pos, 5, rl.Blue)
+    e.shoot(g)
+}
+
+func (p *player) move() {
+    if rl.IsKeyDown(rl.KeyW) { p.pos.Y -= p.moveSpeed }
+    if rl.IsKeyDown(rl.KeyS) { p.pos.Y += p.moveSpeed }
+    if rl.IsKeyDown(rl.KeyA) { p.pos.X -= p.moveSpeed }
+    if rl.IsKeyDown(rl.KeyD) { p.pos.X += p.moveSpeed }
+}
+
+func (p *player) shoot(g *game){
+    if rl.IsMouseButtonDown(rl.MouseLeftButton) {
+        // não leva em consideração a velocidade do jogador
+        mouse := rl.GetMousePosition()
+        direction := rl.Vector2Subtract(mouse, p.pos)
+        direction = rl.Vector2Normalize(direction)
+        g.bullets = append(g.bullets, &bullet{
+            pos: p.pos,
+            size: 2,
+            speed: rl.Vector2Scale(direction, p.bulletMoveSpeed),
+            dmg: 1,
+            enemy: false,
+        })
+    }
+}
+
+func (p *player) checkHit(g *game) {
+    for _, bullet := range g.bullets {
+        if !bullet.enemy {
+            continue
+        }
+        distance := rl.Vector2Distance(p.pos, bullet.pos) - bullet.size
+        // fmt.Println(distance)
+
+        if distance < 0 {
+            fmt.Println("hit!")
+        }
+    }
+}
+
+func (p *player) update(g *game) {
+
+    p.move()
+
+    p.shoot(g)
+
+    p.checkHit(g)
+
+    // hitbox
+    rl.DrawCircleV(p.pos, 5, rl.Red)
+
+    // mira
+    mouse := rl.GetMousePosition()
+    inverted := rl.Vector2Subtract(p.pos, mouse)
+    inverted = rl.Vector2Negate(inverted)
+    inverted = rl.Vector2Normalize(inverted)
+    inverted = rl.Vector2Scale(inverted, 2000)
+    rl.DrawLineV(p.pos, rl.Vector2Add(mouse, inverted), rl.Red)
+
+}
+
+func main() {
+
+    state := &game{screenWidth: 450, screenHeight: 700}
+
+    player := player{
+        pos: rl.Vector2{X: 100, Y: 100},
+        moveSpeed: 4,
+        bulletMoveSpeed: 8,
+    }
+
+    rl.SetTraceLog(rl.LogWarning | rl.LogDebug)
+	rl.InitWindow(state.screenWidth, state.screenHeight, "danmaku")
+	rl.SetTargetFPS(60)
+
+    state.enemies = append(state.enemies, &enemy{
+        pos: rl.Vector2{X: 200, Y: 200},
+        health: 10,
+    })
+    state.enemies = append(state.enemies, &enemy{
+        pos: rl.Vector2{X: 169, Y: 222},
+        health: 10,
+    })
+    state.enemies = append(state.enemies, &enemy{
+        pos: rl.Vector2{X: 219, Y: 195},
+        health: 10,
+    })
+
+	for ; !rl.WindowShouldClose(); state.time += 1 {
+		rl.BeginDrawing()
+		rl.ClearBackground(rl.Black)
+
+		rl.DrawText("danmaku", 20, 20, 20, rl.DarkGray)
+		rl.DrawLine(18, 42, state.screenWidth-18, 42, rl.Black)
+        rl.DrawFPS(0, 0)
+
+        player.update(state)
+
+        for i := range state.enemies {
+            state.enemies[i].update(state)
+        }
+
+        for i := 0; i < len(state.bullets); i++ {
+            state.bullets[i].update(state, i)
+        }
+
+		rl.EndDrawing()
+	}
+
+	rl.CloseWindow()
+}