add angle

game/love_src/src/world/top_down_race/system/velocity.lua

@@ -58,10 +58,11 @@ local function get(e)
     e[race.dict.decel].data
 end
 
-local function draw(text, x, y, sx, sy, angle)
+local function draw(text, x, y, sx, sy, angle, image, origin)
   love.graphics.push()
   love.graphics.scale(sx, sy)
-  love.graphics.rotate(angle)
+  -- love.graphics.rotate(angle)
+  love.graphics.draw(image, x, y, angle, 1, 1, origin[1], origin[2])
   love.graphics.print(text, x, y)
   love.graphics.pop()
 end
@@ -76,17 +77,25 @@ function system:load()
   component.component("race.angle", function (c, x)
     c.data = x
   end)
+  component.component("race.image", function (c, x)
+    c.data = {
+      image = love.graphics.newImage(x)
+    }
+    c.data.origin = vm.vec2(c.data.image:getWidth()/2, c.data.image:getHeight()/2)
+  end)
 
   for _, e in ipairs(self.pool) do
     e:give("race.pos", 10, 10)
     e:give("race.scale", 1, 1)
     e:give("race.angle", 0)
+    e:give("race.image", "love_src/asset/image/arrow_right.png")
   end
 end
 
 function system:update(dt)
   for _, e in ipairs(self.pool) do
     local accel, brake, grip, max_speed, steer, velocity, drag, decel = get(e)
+
     local up = love.keyboard.isDown("up")
     local down = love.keyboard.isDown("down")
     local left = love.keyboard.isDown("left")
@@ -100,16 +109,22 @@ function system:update(dt)
       e[race.dict.velocity].data = racing_phy.accelerate(dt, 1, velocity, max_speed, -drag -decel)
     end
 
+    local angle = e["race.angle"].data
     if (left) then
-      e["race.angle"].data = e["race.angle"].data - 1 * dt
+      e["race.angle"].data = angle - 1 * dt
     end
     if (right) then
-      e["race.angle"].data = e["race.angle"].data + 1 * dt
+      e["race.angle"].data = angle + 1 * dt
     end
 
+    angle = e["race.angle"].data
+    cos = math.cos(angle)
+    sin = math.sin(angle)
+
     velocity = e[race.dict.velocity].data
 
-    e["race.pos"].data = vm.vec2(e["race.pos"].data[1] + velocity, e["race.pos"].data[2])
+    e["race.pos"].data[1] = e["race.pos"].data[1] + velocity * cos
+    e["race.pos"].data[2] = e["race.pos"].data[2] + velocity * sin
     -- print(racing_phy.drift(dt, 1, velocity, max_speed, 2, 10))
   end
 end
@@ -118,7 +133,9 @@ function system:draw()
   for _, e in ipairs(self.pool) do
     local accel, brake, grip, max_speed, steer, velocity = get(e)
     local x, y, sx, sy, angle = e["race.pos"].data[1], e["race.pos"].data[2], e["race.scale"].data[1], e["race.scale"].data[2], e["race.angle"].data
-    draw(velocity, x, y, sx, sy, angle)
+    local image = e["race.image"].data.image
+    local origin = e["race.image"].data.origin
+    draw(velocity, x, y, sx, sy, angle, image, origin)
   end
 end