first commit

src/Ball.lua

@@ -0,0 +1,69 @@
+
+Ball = Class{}
+
+function Ball:init(x, y, dx, dy)
+    self.x = x
+    self.y = y
+    self.width = 8
+    self.height = 8
+
+    -- these variables are for keeping track of our velocity on both the
+    -- X and Y axis, since the ball can move in two dimensions
+    self.dy = dx
+    self.dx = dy
+    self.remove = false
+    self.hitPlayer = false
+end
+function Ball:reset()
+    self.x = VIRTUAL_WIDTH / 2 - 2
+    self.y = VIRTUAL_HEIGHT / 2 - 2
+    self.dx = 0
+    self.dy = 0
+end
+
+function Ball:update(dt,level)
+    local tempX = self.x + self.dx * dt
+    local tempY = self.y + self.dy * dt
+
+    local trailSeg = level:pointOnEdge(tempX,tempY,level.player.trailSegments)
+    if trailSeg then
+        self.hitPlayer = true
+        gSounds['hit']:play()
+    end
+
+    local i, segment = level:getTouchingSegment(tempX,tempY)
+    if segment then
+        local direction = self:getCollisionDirection(segment, tempX, tempY)
+        if direction == 'up' or direction == 'down' then
+            self.dy = - self.dy
+        elseif direction == 'right' or direction == 'left' then
+            self.dx = -self.dx
+        elseif level:pointOnEdge(tempX,tempY) then
+            self.dx = -self.dx
+            self.dy = -self.dy
+        elseif not level:insideBounds(tempX,tempY) then
+            self.dx = -self.dx
+            self.dy = -self.dy
+        end
+        gSounds['blip']:stop()
+        gSounds['blip']:play()
+    end
+
+    if not (level:insideBounds(tempX,tempY) or level:pointOnEdge(tempX,tempY)) then
+        self.remove = true
+    end
+
+    self.x = self.x + self.dx * dt
+    self.y = self.y + self.dy * dt
+
+    
+end
+
+function Ball:render()
+    love.graphics.setColor(255,255,255,255)
+    love.graphics.circle('fill', self.x, self.y, self.width/2)
+end
+
+function Ball:getCollisionDirection(segment,x,y)
+    return segment:sideOfSegment(x,y)
+end