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Index › Processing Development › Libraries,  Tool Development › request for .DXF *Import*
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request for .DXF *Import* (Read 3180 times)
n-architecture
request for .DXF *Import*
Mar 16th, 2006, 7:57pm  
Some old posts have mentioned a .dxf importer for Processing, but I haven't been able to find it. I know there is an old .dxf exporter for the Alpha...

I need something that can draw lines from a .dxf file, preferably with layer control as I want to parse, draw, and then process them in sequence and I'd like it to be organized. I don't need 3D or much else.

I've tried other vector libraries for processing (SVG, etc.) and attempted to make use of Java DXF parsers, but they either don't have the features I need or are too complex for me to get into.

Was there ever a .dxf importer for Processing? I'd like to think if there is/ was it would be relatively straightforward. Otherwise, is there a simple way to parse the point data out of a .DXF file, preferably by layer?

Thanks.
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mflux
Re: request for .DXF *Import*
Reply #1 - Mar 20th, 2006, 5:24am  
Can you convert your models to OBJ? Tatsuya Saito has an obj importer that works fantastically.
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fluxhavoc  
n-architecture
Re: request for .DXF *Import*
Reply #2 - Mar 26th, 2006, 8:20am  
I'm familiar with the .obj import, but I need to convert *lines*, not a 3D model. And I need them with layering intact.

.obj won't cut it.
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mflux
Re: request for .DXF *Import*
Reply #3 - Apr 11th, 2006, 10:09am  
Perhaps you can write your own?

I've looked at maya ascii formats and generaly copy-pasting data directly into a text file then writing a reader works great.

If your software can output some easily readable data, so much the better.
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fluxhavoc  
seltar
Re: request for .DXF *Import*
Reply #4 - Apr 12th, 2006, 1:29pm  
i wrote an asc saver some time ago.. it's on my site, at http://seltar.wliia.org/sketch.php?pid=4 .. could probably give you some hint to how it's written.. maybe you could write an importer / exporter library for it..

-seltar
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n-architecture
Re: request for .DXF *Import*
Reply #5 - Apr 26th, 2006, 9:00pm  
seltar, thanks for the info.

i ended up coding my own parser using java, but it needs a lot of work to become a full processing library-- right now it's kind of a kludge.

i plan to work on it when i have more time this summer.
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Ky Jace
Re: request for .DXF *Import*
Reply #6 - Mar 18th, 2010, 6:14am  
Hey,

anyone made any major steps on this subject?
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BNichols
Re: request for .DXF *Import*
Reply #7 - Mar 18th, 2010, 9:33pm  
This code is kinda rough (spent a total of about 2 hours, most of it reading images.autodesk.com/adsk/files/dxf_format.pdf), but it might do about what you need it to. This code was made for converting simple lines, arcs and circles into G-Code for CNC machines.

Quote:
String[] dxf;
String[] vport;
String[] entity;
String[][] ent;
String[][] code;

float viewcenterX = 0;
float viewcenterY = 0;
float viewWidthX = 1;
float viewWidthY = 1;
float aspectRatio = 1;
float zoom = 1;

void DXFImport(){  
  readDXF();
  
  viewcenterX = float(vport[0]);
  viewcenterY = float(vport[2]);
  viewWidthY = float(vport[28]);
  aspectRatio = float(vport[30]);
  viewWidthX = viewWidthY * aspectRatio;
  zoom = fixedheight / viewWidthY;
}

void drawDXF() {
  noFill();
  ellipseMode(CENTER);
  
  pushMatrix();
  translate(width/2, height/2);
  scale(zoom);
  strokeWeight(1/zoom);
  translate(-viewcenterX, viewcenterY);
  
  for(int i = 1; i < ent.length; i++){
    if(ent[i][1].contains("LINE")){
      if(ent[i][5].contains("HID")){stroke(0, 200, 0);}else{stroke(255);}
      line(float(ent[i][7]), -float(ent[i][9]), float(ent[i][13]), -float(ent[i][15]));
    }
    if(ent[i][1].contains("ARC")){
      float SA, EA;
      SA = 360 - float(ent[i][17]);
      EA = 360 - float(ent[i][15]);
      if(SA > EA){EA += 360;}
      
      if(ent[i][5].contains("HID")){stroke(0, 200, 0);}else{stroke(255);}
      arc(float(ent[i][7]), -float(ent[i][9]), 2*float(ent[i][13]), 2*float(ent[i][13]), radians(SA), radians(EA));
    }
    if(ent[i][1].contains("CIRCLE")){
      if(ent[i][5].contains("HID")){stroke(0, 200, 0);}else{stroke(255);}
      ellipse(float(ent[i][7]), -float(ent[i][9]), 2*float(ent[i][13]), 2*float(ent[i][13]));
    }
  }
  popMatrix();
}

void readDXF() {
  dxf = loadStrings(folderPath);
  vport = cutSection(dxf, "VPORT", "ENDTAB");
  vport = cutSection(vport, " 12", " 43");
  dxf = cutSection(dxf, "ENTITIES", "ENDSEC");
  
  int numEntities = 0;
  for(int i = 0; i < dxf.length; i++){
    if(dxf[i].contains("  0")){
      dxf[i] = "ENTITY";
      numEntities ++;
    }
  }
  String joindxf;
  joindxf = join(dxf, "~");
  
  entity = split(joindxf, "ENTITY");
  ent = new String[numEntities + 1][];
  for(int i = 0; i <= numEntities; i++){
    ent[i] = split(entity[i], "~");
  }
}

String[] cutSection(String[] dxfs, String startcut, String endcut) {
  int cutS = -1;
  for(int i = 0; i < dxfs.length; i++){
    if(dxfs[i].contains(startcut)){
      cutS = i;
    }
  }
  if(cutS == -1){println("SECTION " + startcut + " NOT FOUND.");}
  dxfs = subset(dxfs, cutS + 1);
  
  int cutF = -1;
  for(int i = 0; i < dxfs.length; i++){
    if(dxfs[i].contains(endcut)){
      cutF = i;
      break;
    }
  }
  if(cutF == -1){println("SECTION NOT TERMINATED at " + endcut + ".");}
  return subset(dxfs, 0, cutF-1);
}
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