From 6d25ee261b04d625a5951534841125465c0ee542 Mon Sep 17 00:00:00 2001
From: silva guimaraes <silva__guimaraes@hotmail.com>
Date: Thu, 14 Sep 2023 11:18:32 -0300
Subject: [PATCH] barra de vida shake

---
 main.go | 49 +++++++++++++++++++++++++++++++++----------------
 1 file changed, 33 insertions(+), 16 deletions(-)

diff --git a/main.go b/main.go
index 29c4a6e..af5c391 100644
--- a/main.go
+++ b/main.go
@@ -15,6 +15,7 @@ const (
 	maxColumns = 5
     enemyAcc = 0.01
     maxSpeed = 0.1
+    buildingsHealth = 3
 )
 
 type enemy struct {
@@ -36,7 +37,7 @@ type building struct {
 
 type healthBar struct {
     life int
-    damageTaken int
+    damageTaken float32
     lastUpdate float64
 }
 
@@ -48,27 +49,43 @@ func draw_plane() {
     )
 }
 
+func randomShake(amount float32) float32 {
+    return rand.Float32() * amount - amount/2
+}
+
 func (hb *healthBar) update(buildings []*building) {
-    const margin = 20
-    buildingsLife := 0
-    maxCityLife := 3 * len(buildings)
+    const MARGIN = 20
+    const BARWIDTH = (WIDTH - MARGIN*2)
+
+    currentLife := 0
+    maxLife := buildingsHealth * len(buildings)
     for _, b := range buildings {
-        buildingsLife += b.life
+        currentLife += b.life
     }
-    position := rl.NewVector2(margin, 10)
-    cityLife := (WIDTH-margin*2) * buildingsLife/maxCityLife
+    position := rl.NewVector2(MARGIN, 10)
+    barWidth := BARWIDTH * currentLife/maxLife
 
-    size := rl.NewVector2(float32(cityLife), 10)
+    size := rl.NewVector2(float32(barWidth), 10)
 
-    hb.damageTaken += cityLife - hb.life
+    hb.damageTaken += float32(hb.life - currentLife)
 
-    damageTaken := size
-    damageTaken.X += float32(hb.damageTaken)
+    damageTakenBar := size
+    damageTakenBar.X = BARWIDTH * 
+    (float32(currentLife) + hb.damageTaken) / float32(maxLife)
 
-    rl.DrawRectangleV(position, damageTaken, rl.Orange)
+    shake := rl.NewVector2(
+        randomShake(0.4) * hb.damageTaken,
+        randomShake(0.4) * hb.damageTaken,
+    )
+    position = rl.Vector2Add(position, shake)
+
+    rl.DrawRectangleV(position, damageTakenBar, rl.Orange)
     rl.DrawRectangleV(position, size, rl.Red)
 
     hb.lastUpdate = rl.GetTime()
+    hb.life = currentLife
+    hb.damageTaken *= 0.95
+
 }
 
 func newHealthBar(buildings []*building) *healthBar {
@@ -77,12 +94,12 @@ func newHealthBar(buildings []*building) *healthBar {
     }
 }
 
-func (b *building) causeDamage() {
+func (b *building) causeDamage(damage int) {
     if b.animate != nil {
         return
     }
     b.animate = shakeBuilding(*b)
-    b.life -= 1
+    b.life -= damage
     fmt.Println("damage:", b.life)
 }
 
@@ -113,7 +130,7 @@ func newBuilding(x, z float32) *building {
 
     return &building{
         color: color,
-        life: 3,
+        life: buildingsHealth,
         pos: pos,
         size: size,
         boundingBox: rl.NewBoundingBox(min, max),
@@ -224,7 +241,7 @@ func damage_building(camera rl.Camera, buildings []*building) {
     }
 
     if closest != nil {
-        closest.causeDamage()
+        closest.causeDamage(3)
     }
 }