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Coordinate system

The Swiss Army Knife map uses a easy to understand coordinate system to simplify the design and placement of toolsets and tools on a card.

Basics

The coordinate system of a SAK Card is based on the following characteristics:

Card:

  • A SAK Card has a configurable aspectratio
  • That aspect ratio determines the internal grid size: aspect ratio * 100.

Toolset & Tools:

  • A Toolset has a default 100x100 grid size. It does NOT depend on the size of a card.
  • The top-left is the origin (0,0)
  • The center coordinates of a toolset are (50,50)
  • All tool dimensions are relative to the default toolset grid size: a line with a length of 10 means 10% of this default grid.

The next paragraph shows an example, and the paragraphs thereafter more details.

An example: Toolset and tool placement @ work

Now we know the basics, let's look at the example with a card size of 200x100 (2/1 aspect ratio) and two identical toolsets consisting of a circle, icon, and state.

The tools are neatly configured around the center position (50,50) of the toolset grid:

  • the circle is placed at (50,50) with its radius of 25,
  • the icon is placed at (50,40) and
  • the state is placed at (50,60).

The first toolset is placed at (40,50) on the card, and the second toolset at (160,50) on the card.

In a kind of 3D world, it looks like this: sak-card-toolset-tool-placement

The YAML configuration is shown below. Here you see the toolsets (named set1 and set2) and the different tools: circle, state and icon. For brevity only the coordinates/sizes part is shown.

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aspectratio: 2/1              # Gives a 200x100 canvas size

layout:
  # Circles with icon and state are placed at (40,50) and (160,50)
  toolsets:
    - toolset: set1
      position:
        cx: 40
        cy: 50
      tools:
        - type: circle
          position:
            cx: 50            # Circle is centered on 100x100
            cy: 50
            radius: 25

        - type: state
          position:
            cx: 50            # x centered
            cy: 60            # y a bit lower

        - type: icon
          position:
            cx: 50            # x centered
            cy: 40            # y a bit higher
            align: center
            icon_size: 15

    - toolset: set2
      position:
        cx: 160
        cy: 50
      tools:
        - type: circle
          position:
            cx: 50            # Circle is centered on 100x100
            cy: 50
            radius: 25

        - type: state
          position:
            cx: 50            # x centered
            cy: 60            # y a bit lower

        - type: icon
          position:
            cx: 50            # x centered
            cy: 40            # y a bit higher
            align: center
            icon_size: 15

More indepth: Card aspect ratio and size

Below you see the configuration of a 1/1 square card which equals a grid size of 100x100.

- type: 'custom:swiss-army-knife-card'
  aspectratio: 1/1        # Square 1/1 card with resulting 100x100 grid size

Example cards with different aspect ratio's

Some examples for aspect ratio's and (grid size) of: 0.5/1 (50x100), 1/1 (100x100), 2/1 (200x100) and 3/1 (300x100):

You are not limited to these aspect ratio's. Any aspect ratio will work

But what about the internal grid size then?

If I would place three square cards in a horizontal-stack with different aspect ratio's, I get three equally sized cards. All cards scale to the same actual size in pixels, independently of their internal grid sizes of 100x100, 200x200 and 400x400.

1/1 2/2 4/4

The result of these different internal sizes can be seen in the following example: I "designed" a toolset with a single circle on a standard 100x100 canvas and placed the toolset for each card on the same position (50,50); The circle scales to the actual grid size of the card. Scalable Vector Graphics at work! 1/1 2/2 4/4

The 1/1, 2/1 and 3/1 are mostly used for mobile phones, and the much larger ones, say 4/4 for panels

The tools on a 4/4 would be too small to read on a mobile phone, but are excellent on large displays.

More indepth: Toolset aspect ratio and size

As already mentioned, the position and dimensions of a tool always reference a default toolset grid size of 100x100:

  • (0,0) is the upper left corner of the grid
  • (100,100) is the lower right corner of the grid
  • (50,50) is the center of the grid and servers as the 'anchor' used by the Toolset to position the tools on a card.

Furthermore, all dimensions are relative to the grid:

  • a line with a length of 10 takes 10% of the grid.
  • a circle with radius of 50 fits exactly the grid.

The size and position of tools are not limited by this grid size!

So:

  • a tool can be wider and higher
  • a tool can be placed outside these default coordinates: so coordinates can be < 0 or > 100.

This means that - without scaling - such a toolset does NOT fit a 1/1 card!
Such toolsets are therefore designed for larger cards.

Don't forget that toolsets can scale tools and are re-usable if defined as a template

Use relative sizes for styles too, where possible

The dimensions of the tool are relative. Therefore, it is recommended to also use relative dimensions for styling. A simple example is the CSS font-size attribute: use em and not px to configure the size of a font, ie use font-size: 12em.

SAK has set the default font-size for SAK cards to be about the same size as 1% of the grid: so font-size: 10em should equal 10% of the grid.

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