write_layers.json

The JSON file of the “One drawing, and each reader sees their own” example. The same floor plan on six layers shown and hidden one at a time: the furniture and the distances shown, the internal notes hidden until asked for, and a draft watermark meant for the screen and not for the paper.

JSON 384 lines

This file is a request: an application sends it over the network to the server, which creates the PDF and sends it back. It makes the same page as the Rust and Python versions of this example. A request names every file it uses, never its content; the call carries the request and the files together. A font the server already holds, such as DejaVuSans, is named with nothing attached. Send the request to the address the API page gives.

The library writes each line of the page at a stated height; a request gives a block of words a rectangle instead, so every line's rectangle here is worked back from that height. Eleven of them reach past the plan they sit under, harmlessly, because the library writes those lines without breaking them and a block of words would break them at the edge of its rectangle. The walls are one colour set once on the library's side, an outer wall and then a partition; on the wire they are two things, each stating that colour for itself, and each piece of furniture is filled and then outlined as two shapes there and drawn once and painted in one go here. The six layers themselves, what each of them carries, and the draft watermark a reader may not decide to print are the same either way, down to the order the panel lists them in.

What this example is for

The same floor plan has to reach three people: the site, with its dimensions; the client, without the internal notes; the printer, without the draft watermark across it. Making three files means three files to keep in step, and the day one of them is remade and the others are not, somebody builds from the wrong drawing.

What this example shows

Download the file The same example in Rust The same example in Python See what it creates 
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{
  "layers": [
    {
      "name": "Furniture",
      "made_by": { "application": "Plan Studio", "work": "technical" }
    },
    { "name": "Dimensions" },
    { "name": "Notes", "visible": false },
    {
      "name": "Draft",
      "on_screen": true,
      "printed": false,
      "purpose": "watermark"
    },
    { "name": "Grid", "visible": false, "intent": "design" },
    { "name": "Crop marks", "purpose": "printers_marks" }
  ],
  "drawings": [
    {
      "name": "chair",
      "layer": "Furniture",
      "box": { "llx": 0.0, "lly": 0.0, "urx": 14.0, "ury": 10.0 },
      "items": [
        {
          "type": "rect",
          "rect": { "llx": 0.5, "lly": 0.5, "urx": 13.5, "ury": 9.5 },
          "fill": [0.85, 0.88, 0.93],
          "stroke": { "width": 1.0, "color": [0.35, 0.45, 0.6] }
        }
      ]
    }
  ],
  "items": [
    {
      "type": "text",
      "rect": { "llx": 80.0, "lly": 750.0, "urx": 560.0, "ury": 768.0 },
      "content": ["One plan, six layers"],
      "font": "DejaVuSans",
      "font_size": 15.0
    },
    {
      "type": "text",
      "rect": { "llx": 80.0, "lly": 730.0, "urx": 590.0, "ury": 742.0 },
      "content": [
        "The walls are always there. Everything else is a layer the reader can show and hide."
      ],
      "font": "DejaVuSans",
      "font_size": 10.0,
      "color": [0.35, 0.35, 0.35]
    },

    {
      "type": "rect",
      "rect": { "llx": 80.0, "lly": 380.0, "urx": 515.0, "ury": 700.0 },
      "stroke": { "width": 3.0, "color": [0.15, 0.15, 0.15] }
    },
    {
      "type": "line",
      "from": { "x": 345.0, "y": 380.0 },
      "to": { "x": 345.0, "y": 570.0 },
      "stroke": { "width": 3.0, "color": [0.15, 0.15, 0.15] }
    },

    {
      "type": "path",
      "segments": [
        { "move_to": { "x": 109.0, "y": 380.0 } },
        { "line_to": { "x": 109.0, "y": 700.0 } },
        { "move_to": { "x": 138.0, "y": 380.0 } },
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        { "move_to": { "x": 341.0, "y": 380.0 } },
        { "line_to": { "x": 341.0, "y": 700.0 } },
        { "move_to": { "x": 370.0, "y": 380.0 } },
        { "line_to": { "x": 370.0, "y": 700.0 } },
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        { "move_to": { "x": 428.0, "y": 380.0 } },
        { "line_to": { "x": 428.0, "y": 700.0 } },
        { "move_to": { "x": 457.0, "y": 380.0 } },
        { "line_to": { "x": 457.0, "y": 700.0 } },
        { "move_to": { "x": 486.0, "y": 380.0 } },
        { "line_to": { "x": 486.0, "y": 700.0 } },
        { "move_to": { "x": 80.0, "y": 412.0 } },
        { "line_to": { "x": 515.0, "y": 412.0 } },
        { "move_to": { "x": 80.0, "y": 444.0 } },
        { "line_to": { "x": 515.0, "y": 444.0 } },
        { "move_to": { "x": 80.0, "y": 476.0 } },
        { "line_to": { "x": 515.0, "y": 476.0 } },
        { "move_to": { "x": 80.0, "y": 508.0 } },
        { "line_to": { "x": 515.0, "y": 508.0 } },
        { "move_to": { "x": 80.0, "y": 540.0 } },
        { "line_to": { "x": 515.0, "y": 540.0 } },
        { "move_to": { "x": 80.0, "y": 572.0 } },
        { "line_to": { "x": 515.0, "y": 572.0 } },
        { "move_to": { "x": 80.0, "y": 604.0 } },
        { "line_to": { "x": 515.0, "y": 604.0 } },
        { "move_to": { "x": 80.0, "y": 636.0 } },
        { "line_to": { "x": 515.0, "y": 636.0 } },
        { "move_to": { "x": 80.0, "y": 668.0 } },
        { "line_to": { "x": 515.0, "y": 668.0 } }
      ],
      "stroke": { "width": 0.3, "color": [0.55, 0.75, 0.9] },
      "layer": "Grid"
    },

    {
      "type": "rect",
      "rect": { "llx": 120.0, "lly": 590.0, "urx": 240.0, "ury": 660.0 },
      "fill": [0.85, 0.88, 0.93],
      "stroke": { "width": 1.0, "color": [0.35, 0.45, 0.6] },
      "layer": "Furniture"
    },
    {
      "type": "rect",
      "rect": { "llx": 380.0, "lly": 570.0, "urx": 470.0, "ury": 680.0 },
      "fill": [0.85, 0.88, 0.93],
      "stroke": { "width": 1.0, "color": [0.35, 0.45, 0.6] },
      "layer": "Furniture"
    },
    {
      "type": "rect",
      "rect": { "llx": 370.0, "lly": 410.0, "urx": 480.0, "ury": 450.0 },
      "fill": [0.85, 0.88, 0.93],
      "stroke": { "width": 1.0, "color": [0.35, 0.45, 0.6] },
      "layer": "Furniture"
    },

    {
      "type": "drawing",
      "drawing": "chair",
      "x": 140.0,
      "y": 662.0
    },
    {
      "type": "drawing",
      "drawing": "chair",
      "x": 173.0,
      "y": 662.0
    },
    {
      "type": "drawing",
      "drawing": "chair",
      "x": 206.0,
      "y": 662.0
    },
    {
      "type": "drawing",
      "drawing": "chair",
      "x": 140.0,
      "y": 578.0
    },
    {
      "type": "drawing",
      "drawing": "chair",
      "x": 173.0,
      "y": 578.0
    },
    {
      "type": "drawing",
      "drawing": "chair",
      "x": 206.0,
      "y": 578.0
    },

    {
      "type": "path",
      "segments": [
        { "move_to": { "x": 80.0, "y": 354.0 } },
        { "line_to": { "x": 515.0, "y": 354.0 } },
        { "move_to": { "x": 80.0, "y": 349.0 } },
        { "line_to": { "x": 80.0, "y": 359.0 } },
        { "move_to": { "x": 515.0, "y": 349.0 } },
        { "line_to": { "x": 515.0, "y": 359.0 } },
        { "move_to": { "x": 34.0, "y": 380.0 } },
        { "line_to": { "x": 34.0, "y": 700.0 } },
        { "move_to": { "x": 29.0, "y": 380.0 } },
        { "line_to": { "x": 39.0, "y": 380.0 } },
        { "move_to": { "x": 29.0, "y": 700.0 } },
        { "line_to": { "x": 39.0, "y": 700.0 } }
      ],
      "stroke": { "width": 0.8, "color": [0.2, 0.5, 0.35] },
      "layer": "Dimensions"
    },
    {
      "type": "text",
      "rect": { "llx": 279.5, "lly": 362.0, "urx": 360.0, "ury": 372.8 },
      "content": ["7.25 m"],
      "font": "DejaVuSans",
      "font_size": 9.0,
      "color": [0.2, 0.5, 0.35],
      "layer": "Dimensions"
    },
    {
      "type": "text",
      "rect": { "llx": 40.0, "lly": 540.0, "urx": 120.0, "ury": 550.8 },
      "content": ["5.00 m"],
      "font": "DejaVuSans",
      "font_size": 9.0,
      "color": [0.2, 0.5, 0.35],
      "layer": "Dimensions"
    },

    {
      "type": "text",
      "rect": { "llx": 124.0, "lly": 570.0, "urx": 340.0, "ury": 579.6 },
      "content": ["Table seats six."],
      "font": "DejaVuSans",
      "font_size": 8.0,
      "color": [0.7, 0.25, 0.1],
      "layer": "Notes"
    },
    {
      "type": "text",
      "rect": { "llx": 372.0, "lly": 552.0, "urx": 590.0, "ury": 561.6 },
      "content": ["Bed against the party wall."],
      "font": "DejaVuSans",
      "font_size": 8.0,
      "color": [0.7, 0.25, 0.1],
      "layer": "Notes"
    },
    {
      "type": "text",
      "rect": { "llx": 372.0, "lly": 396.0, "urx": 590.0, "ury": 405.6 },
      "content": ["Counter, waste under."],
      "font": "DejaVuSans",
      "font_size": 8.0,
      "color": [0.7, 0.25, 0.1],
      "layer": "Notes"
    },

    {
      "type": "stamp",
      "rect": { "llx": 80.0, "lly": 380.0, "urx": 515.0, "ury": 700.0 },
      "content": "DRAFT",
      "font": "DejaVuSans",
      "slant": "up",
      "color": [0.8, 0.3, 0.3],
      "layer": "Draft"
    },

    {
      "type": "path",
      "segments": [
        { "move_to": { "x": 30.0, "y": 36.0 } },
        { "line_to": { "x": 12.0, "y": 36.0 } },
        { "move_to": { "x": 36.0, "y": 30.0 } },
        { "line_to": { "x": 36.0, "y": 12.0 } },
        { "move_to": { "x": 565.0, "y": 36.0 } },
        { "line_to": { "x": 583.0, "y": 36.0 } },
        { "move_to": { "x": 559.0, "y": 30.0 } },
        { "line_to": { "x": 559.0, "y": 12.0 } },
        { "move_to": { "x": 30.0, "y": 806.0 } },
        { "line_to": { "x": 12.0, "y": 806.0 } },
        { "move_to": { "x": 36.0, "y": 812.0 } },
        { "line_to": { "x": 36.0, "y": 830.0 } },
        { "move_to": { "x": 565.0, "y": 806.0 } },
        { "line_to": { "x": 583.0, "y": 806.0 } },
        { "move_to": { "x": 559.0, "y": 812.0 } },
        { "line_to": { "x": 559.0, "y": 830.0 } }
      ],
      "stroke": { "width": 0.5, "color": [0.0, 0.0, 0.0] },
      "layer": "Crop marks"
    },

    {
      "type": "text",
      "rect": { "llx": 80.0, "lly": 300.0, "urx": 165.0, "ury": 312.0 },
      "content": ["Furniture"],
      "font": "DejaVuSans",
      "font_size": 10.0
    },
    {
      "type": "text",
      "rect": { "llx": 170.0, "lly": 300.0, "urx": 590.0, "ury": 312.0 },
      "content": ["shown; turn it off and the rooms stand empty, chairs too"],
      "font": "DejaVuSans",
      "font_size": 10.0,
      "color": [0.35, 0.35, 0.35]
    },
    {
      "type": "text",
      "rect": { "llx": 80.0, "lly": 282.0, "urx": 165.0, "ury": 294.0 },
      "content": ["Dimensions"],
      "font": "DejaVuSans",
      "font_size": 10.0
    },
    {
      "type": "text",
      "rect": { "llx": 170.0, "lly": 282.0, "urx": 590.0, "ury": 294.0 },
      "content": ["shown; the distances around the plan"],
      "font": "DejaVuSans",
      "font_size": 10.0,
      "color": [0.35, 0.35, 0.35]
    },
    {
      "type": "text",
      "rect": { "llx": 80.0, "lly": 264.0, "urx": 165.0, "ury": 276.0 },
      "content": ["Notes"],
      "font": "DejaVuSans",
      "font_size": 10.0
    },
    {
      "type": "text",
      "rect": { "llx": 170.0, "lly": 264.0, "urx": 590.0, "ury": 276.0 },
      "content": ["hidden; turn it on to read them"],
      "font": "DejaVuSans",
      "font_size": 10.0,
      "color": [0.35, 0.35, 0.35]
    },
    {
      "type": "text",
      "rect": { "llx": 80.0, "lly": 246.0, "urx": 165.0, "ury": 258.0 },
      "content": ["Draft"],
      "font": "DejaVuSans",
      "font_size": 10.0
    },
    {
      "type": "text",
      "rect": { "llx": 170.0, "lly": 246.0, "urx": 590.0, "ury": 258.0 },
      "content": ["shown on screen, never printed; the file calls it a watermark"],
      "font": "DejaVuSans",
      "font_size": 10.0,
      "color": [0.35, 0.35, 0.35]
    },
    {
      "type": "text",
      "rect": { "llx": 80.0, "lly": 228.0, "urx": 165.0, "ury": 240.0 },
      "content": ["Grid"],
      "font": "DejaVuSans",
      "font_size": 10.0
    },
    {
      "type": "text",
      "rect": { "llx": 170.0, "lly": 228.0, "urx": 590.0, "ury": 240.0 },
      "content": ["hidden; an aid for whoever drew the plan, not part of it"],
      "font": "DejaVuSans",
      "font_size": 10.0,
      "color": [0.35, 0.35, 0.35]
    },
    {
      "type": "text",
      "rect": { "llx": 80.0, "lly": 210.0, "urx": 165.0, "ury": 222.0 },
      "content": ["Crop marks"],
      "font": "DejaVuSans",
      "font_size": 10.0
    },
    {
      "type": "text",
      "rect": { "llx": 170.0, "lly": 210.0, "urx": 590.0, "ury": 222.0 },
      "content": ["shown; the file calls them printer's marks"],
      "font": "DejaVuSans",
      "font_size": 10.0,
      "color": [0.35, 0.35, 0.35]
    },
    {
      "type": "text",
      "rect": { "llx": 80.0, "lly": 180.0, "urx": 590.0, "ury": 192.0 },
      "content": ["The draft mark carries its own answer for the printer, so nothing has to"],
      "font": "DejaVuSans",
      "font_size": 10.0,
      "color": [0.35, 0.35, 0.35]
    },
    {
      "type": "text",
      "rect": { "llx": 80.0, "lly": 166.0, "urx": 590.0, "ury": 178.0 },
      "content": ["be switched off before the page is printed."],
      "font": "DejaVuSans",
      "font_size": 10.0,
      "color": [0.35, 0.35, 0.35]
    }
  ]
}