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GRAVITY = -0.08
class Ball
attr_accessor :velocity, :center, :radius, :collision_enabled
def initialize args
#Start the ball in the top center
#@x = args.grid.w / 2
#@y = args.grid.h - 20
@velocity = {x: 0, y: 0}
#@width = 20
#@height = @width
@radius = 20.0 / 2.0
@center = {x: (args.grid.w / 2), y: (args.grid.h)}
#@left_wall = (args.state.board_width + args.grid.w / 8)
#@right_wall = @left_wall + args.state.board_width
@left_wall = 0
@right_wall = $args.grid.right
@max_velocity = 7
@collision_enabled = true
end
#Move the ball according to its velocity
def update args
@center.x += @velocity.x
@center.y += @velocity.y
@velocity.y += GRAVITY
alpha = 0.2
if @center.y-@radius <= 0
@velocity.y = (@velocity.y.abs*0.7).abs
@velocity.x = (@velocity.x.abs*0.9).abs * ((@velocity.x < 0) ? -1 : 1)
if @velocity.y.abs() < alpha
@velocity.y=0
end
if @velocity.x.abs() < alpha
@velocity.x=0
end
end
if @center.x > args.grid.right+@radius*2
@center.x = 0-@radius
elsif @center.x< 0-@radius*2
@center.x = args.grid.right + @radius
end
end
def wallBounds args
#if @x < @left_wall || @x + @width > @right_wall
#@velocity.x *= -1.1
#if @velocity.x > @max_velocity
#@velocity.x = @max_velocity
#elsif @velocity.x < @max_velocity * -1
#@velocity.x = @max_velocity * -1
#end
#end
#if @y < 0 || @y + @height > args.grid.h
#@velocity.y *= -1.1
#if @velocity.y > @max_velocity
#@velocity.y = @max_velocity
#elsif @velocity.y < @max_velocity * -1
#@velocity.y = @max_velocity * -1
#end
#end
end
#render the ball to the screen
def draw args
#args.outputs.solids << [@x, @y, @width, @height, 255, 255, 0];
args.outputs.sprites << [
@center.x-@radius,
@center.y-@radius,
@radius*2,
@radius*2,
"sprites/circle-white.png",
0,
255,
255, #r
0, #g
255 #b
]
end
end
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