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Add length method

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This commit is contained in:
Alex Clink 2021-12-12 21:33:10 -05:00
parent 3d4470216e
commit 1164cf50d6
1 changed files with 13 additions and 9 deletions
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22
examples/cube.cr
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@ -64,10 +64,14 @@ struct Vec3d(T)
)
end
# Geth the length using pythagorean
def length
Math.sqrt(@x * @x + @y * @y + @z * @z)
end
def normalized
# pythag
length = Math.sqrt(@x * @x + @y * @y + @z * @z)
Vec3d.new(@x / length, @y / length, @z / length)
l = length
Vec3d.new(@x / l, @y / l, @z / l)
end
# Returns the dot product
@ -329,24 +333,24 @@ class CubeGame < PF::Game
@paused = !@paused if @controller.pressed?("Pause")
if @controller.action?("Rotate Right")
@cube.rotation = Vec3d.new(@cube.rotation.x + @speed * dt, @cube.rotation.y, @cube.rotation.z)
@cube.rotation.x = @cube.rotation.x + @speed * dt
end
if @controller.action?("Rotate Left")
@cube.rotation = Vec3d.new(@cube.rotation.x - @speed * dt, @cube.rotation.y, @cube.rotation.z)
@cube.rotation.x = @cube.rotation.x - @speed * dt
end
if @controller.action?("Rotate Up")
@cube.rotation = Vec3d.new(@cube.rotation.x, @cube.rotation.y, @cube.rotation.z - @speed * dt)
@cube.rotation.z = @cube.rotation.z - @speed * dt
end
if @controller.action?("Rotate Down")
@cube.rotation = Vec3d.new(@cube.rotation.x, @cube.rotation.y, @cube.rotation.z + @speed * dt)
@cube.rotation.z = @cube.rotation.z + @speed * dt
end
unless @paused
@theta += dt
@cube.rotation = Vec3d.new(@cube.rotation.x, @cube.rotation.y + 1.0 * dt, @cube.rotation.z)
@cube.rotation.y = @cube.rotation.y + 1.0 * dt
end
@cube.update(dt)
@ -358,5 +362,5 @@ class CubeGame < PF::Game
end
end
engine = CubeGame.new(200, 200, 3)
engine = CubeGame.new(400, 300, 2)
engine.run!