Can't get my head around dx

[TonAtLacework]

So dx seems to be simple:

• 0 (default) Sprites scroll from left to right
• 1 Sprites scroll from right to left

So why is my text scrolling from left to right and back from right to left no matter what i set the parameter to?

  eventdescription:
      type: DynamicFancyText
      #label: 'Description '
      data_label: event_description
      label_color: red
      value_color: white
      font_name: 5x7.bdf
      dx: 1
      ticks_per_movement: 5

[partofthething]

Oof yeah sorry about that. There's an undocumented option that defaults to true that you have to add to turn off the 'flipping':

try adding can_flip: false

  eventdescription:
      type: DynamicFancyText
      #label: 'Description '
      data_label: event_description
      label_color: red
      value_color: white
      font_name: 5x7.bdf
      dx: 1
      ticks_per_movement: 5
      can_flip: false

[TonAtLacework]

Ah, i love undocumented features. Now the issue i am having is when i make dx 0 or when i comment it out, i don't get my eventdescription sprite. Setting it to -1 provides the behavior i am looking for. Bug?

[partofthething]

Yeah I need to do a doc update for sure.

dx is supposed to mean "change in x per tick" so 0 would mean motionless (you'd have to set x and y to something more than 0 sometimes to see the sprite. -1 means it moves but in the opposite direction.

[TonAtLacework]

Hi Nick!

Fully understood. I thought that dx was indicating direction of motion and not "change in x per tick". Maybe I got thrown off-guard by the default value of 0 which, as I understand now, means no motion at all. Have you considered changing the default value to 1 so the sprite at least moves when dx and dy are used?

Ton.

On Sat, Oct 16, 2021, 07:14 Nick Touran @.***> wrote:

Yeah I need to do a doc update for sure.

dx is supposed to mean "change in x per tick" so 0 would mean motionless (you'd have to set x and y to something more than 0 sometimes to see the sprite. -1 means it moves but in the opposite direction.

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