Hello,
I am simulating a ball being dragged around by a player. I'd like to create some animation to simulate that the ball is rotating (top-down view). I am trying to do that with a light source on top of the ball but I can't quite get it working correctly.
Looking for advice or some pointers to good tutorials on this subject.
Thanks in advance
function _init()
player = {x=64, y=64}
end
function _update()
local move_x, move_y = 0, 0
if btn(0) then move_x = -1 end
if btn(1) then move_x = 1 end
if btn(2) then move_y = -1 end
if btn(3) then move_y = 1 end
-- update player position and animation
if move_x != 0 or move_y != 0 then
player.x += move_x
player.y += move_y
end
update_ball()
end
function _draw()
cls()
rectfill(player.x,
player.y,
player.x+8,
player.y+8,
8)
draw_ball()
end
--ball
ball = {x=80, y=80, vx=0, vy=0, length=24, friction=0.9, mass=5, pull_force=0.2}
ball.hitbox = {2,2,6,6}
ball.name = "ball"
ball.radius = 5
-- in ball initialization
ball.light_pos = {x = ball.x, y = ball.y}
function distance(x1, y1, x2, y2)
return sqrt((x2-x1)^2 + (y2-y1)^2)
end
function update_ball()
local dx = ball.x - player.x
local dy = ball.y - player.y
local dist = distance(ball.x, ball.y, player.x, player.y)
if dist > ball.length then
local angle = atan2(dx, dy)
local pull_strength = (dist - ball.length) * ball.pull_force
ball.vx -= cos(angle) * pull_strength
ball.vy -= sin(angle) * pull_strength
end
ball.vx *= ball.friction
ball.vy *= ball.friction
ball.x += ball.vx
ball.y += ball.vy
if ball.vx != 0 or ball.vy != 0 then
local move_dir_x = ball.vx > 0 and 1 or (ball.vx < 0 and -1 or 0)
local move_dir_y = ball.vy > 0 and 1 or (ball.vy < 0 and -1 or 0)
ball.light_pos.x += move_dir_x * 0.5
ball.light_pos.y += move_dir_y * 0.5
-- check if light has reached ball edge
local light_dist = distance(ball.x, ball.y, ball.light_pos.x, ball.light_pos.y)
if light_dist >= ball.radius+1 then
-- move light along the direction of movement
ball.rolled_under = true
ball.roll_under_timer = ball.roll_under_frames
-- reposition light on opposite side of ball and continue moving
ball.light_pos.x = ball.x - move_dir_x * ball.radius
ball.light_pos.y = ball.y - move_dir_y * ball.radius
-- immediately continue moving in the same direction
ball.light_pos.x += move_dir_x * 0.5
ball.light_pos.y += move_dir_y * 0.5
end
end
end
function draw_ball()
line(player.x+4, player.y+4, ball.x, ball.y, 13)
circfill(ball.x, ball.y, 5, 1)
-- light spot
circfill(ball.light_pos.x, ball.light_pos.y, 1, 7)
end |
4 comments
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5 comments
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1 comment
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0 comments
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7 comments
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1 comment
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Additions
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Game Modes
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2 comments
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18 comments
