From bee71fe254767c7eab5bbdfca9cb7513468867bc Mon Sep 17 00:00:00 2001
From: Ivan Yuriev <ivanyr44@gmail.com>
Date: Sat, 2 Aug 2025 23:58:59 +0300
Subject: [PATCH] - improved camera smoothness - implemented camera zoom

---
 camera.lua          | 36 +++++++++++++++++++++++++-----------
 lib/panning.lua     | 22 ++++++++++++++++++++++
 lib/tree.lua        |  2 +-
 lib/wheelscroll.lua | 22 ----------------------
 main.lua            |  2 +-
 5 files changed, 49 insertions(+), 35 deletions(-)
 create mode 100644 lib/panning.lua
 delete mode 100644 lib/wheelscroll.lua

diff --git a/camera.lua b/camera.lua
index 7a7b952..7ef7bca 100644
--- a/camera.lua
+++ b/camera.lua
@@ -3,7 +3,7 @@ local tree = require "lib/tree"
 
 local EPSILON = 0.001
 
---- @class (exact) Camera
+--- @class Camera
 --- @field position Vec3
 --- @field velocity Vec3
 --- @field speed number
@@ -11,22 +11,34 @@ local EPSILON = 0.001
 local camera = {
     position = Vec3 {},
     velocity = Vec3 {},
+    acceleration = 0.2,
     speed = 5,
-    pixelsPerMeter = 100
+    pixelsPerMeter = 100,
+    scale = 1
 }
 
+love.wheelmoved = function(x, y)
+    if camera.scale > 2 and y > 0 then return end;
+    if camera.scale < 0.5 and y < 0 then return end;
+    camera.scale = camera.scale + 0.1 * y
+end
+
 ---@todo Отрефакторить и вынести кнопки управления в controls, не должно быть таких ужасных проверок
 function camera:update(dt)
-    local ws = tree.instance().wheelscroll
-    if ws.delta:length() > 0 then
-        local worldDelta = ws.delta:scale(1 / self.pixelsPerMeter):scale(dt):scale(self.speed)
+    local ps = tree.instance().panning
+    if ps.delta:length() > 0 then
+        local worldDelta = ps.delta:scale(1 / (self.pixelsPerMeter * self.scale)):scale(dt):scale(self.speed)
         self.velocity = self.velocity + worldDelta
     elseif love.keyboard.isDown("w") or love.keyboard.isDown("a") or love.keyboard.isDown("s") or love.keyboard.isDown("d") then
-        if love.keyboard.isDown("w") then self.velocity = self.velocity + Vec3({ 0, -1 }) end
-        if love.keyboard.isDown("a") then self.velocity = self.velocity + Vec3({ -1 }) end
-        if love.keyboard.isDown("s") then self.velocity = self.velocity + Vec3({ 0, 1 }) end
-        if love.keyboard.isDown("d") then self.velocity = self.velocity + Vec3({ 1 }) end
-        self.velocity = (self.velocity:normalize() or Vec3 {}):scale(self.speed):scale(dt)
+        local input = Vec3 {}
+        if love.keyboard.isDown("w") then input = input + Vec3({ 0, -1 }) end
+        if love.keyboard.isDown("a") then input = input + Vec3({ -1 }) end
+        if love.keyboard.isDown("s") then input = input + Vec3({ 0, 1 }) end
+        if love.keyboard.isDown("d") then input = input + Vec3({ 1 }) end
+        input = input:normalize() or Vec3 {}
+
+        self.velocity = self.velocity:add(input:scale(self.acceleration):scale(dt))
+        if self.velocity:length() > self.speed then self.velocity = self.velocity:normalize() * self.speed end
     end
 
     self.position = self.position + self.velocity
@@ -37,8 +49,10 @@ function camera:update(dt)
 end
 
 function camera:attach()
+    local wc, hc = love.graphics.getWidth() / 2, love.graphics.getHeight() / 2
     love.graphics.push()
-    love.graphics.scale(self.pixelsPerMeter)
+    love.graphics.translate(wc, hc)
+    love.graphics.scale(self.pixelsPerMeter * self.scale)
     love.graphics.translate(-self.position.x, -self.position.y)
 end
 
diff --git a/lib/panning.lua b/lib/panning.lua
new file mode 100644
index 0000000..29e16cd
--- /dev/null
+++ b/lib/panning.lua
@@ -0,0 +1,22 @@
+local Vec3 = require "lib/vec3"
+
+--- @class PanningState
+--- @field pos Vec3 | nil
+--- @field delta Vec3
+local panning = {
+    pos = nil,
+    delta = Vec3 {},
+}
+
+function panning:update(dt)
+    if love.mouse.isDown(3) then
+        local mouseX, mouseY = love.mouse.getPosition()
+        if (panning.pos) then panning.delta = panning.pos - Vec3 { mouseX, mouseY } end
+        panning.pos = Vec3 { mouseX, mouseY }
+        return
+    end
+    panning.pos = nil
+    panning.delta = Vec3 {}
+end
+
+return panning
diff --git a/lib/tree.lua b/lib/tree.lua
index dd2a2b5..74f74cb 100644
--- a/lib/tree.lua
+++ b/lib/tree.lua
@@ -7,7 +7,7 @@ local tree
 
 local function instance()
     tree = tree or {
-        wheelscroll = require "lib/wheelscroll"
+        panning = require "lib/panning"
     }
     return tree
 end
diff --git a/lib/wheelscroll.lua b/lib/wheelscroll.lua
deleted file mode 100644
index 978b153..0000000
--- a/lib/wheelscroll.lua
+++ /dev/null
@@ -1,22 +0,0 @@
-local Vec3 = require "lib/vec3"
-
---- @class WheelScroll
---- @field pos Vec3 | nil
---- @field delta Vec3
-local wheelscroll = {
-    pos = nil,
-    delta = Vec3 {}
-}
-
-function wheelscroll:update(dt)
-    if love.mouse.isDown(3) then
-        local mouseX, mouseY = love.mouse.getPosition()
-        if (wheelscroll.pos) then wheelscroll.delta = wheelscroll.pos - Vec3 { mouseX, mouseY } end
-        wheelscroll.pos = Vec3 { mouseX, mouseY }
-        return
-    end
-    wheelscroll.pos = nil
-    wheelscroll.delta = Vec3 {}
-end
-
-return wheelscroll
diff --git a/main.lua b/main.lua
index 5693c50..6338f84 100644
--- a/main.lua
+++ b/main.lua
@@ -28,7 +28,7 @@ end
 
 function love.update(dt)
     Camera:update(dt)
-    tree.instance().wheelscroll:update(dt)
+    tree.instance().panning:update(dt)
 end
 
 function love.draw()