[solved] Dashed and dotted lines on different layers

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Patry0t
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[solved] Dashed and dotted lines on different layers

Post by Patry0t » Mon Nov 21, 2016 1:04 pm

Hello everyone!

I would like to ask, how can I draw a dashed (--- --- --- ---) and a dashdot (--- - --- - --- - ---) line with dxflib? Also I would like to draw them to different layers: continuous lines to layer '0', dashed line to layer 'd', and dashdot line to layer 'dd' .
I read the documentation but maybe I'm too tired and missing something, could someone help with this?

Patry0t

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andrew
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Re: Dashed and dotted lines on different layers

Post by andrew » Mon Nov 21, 2016 1:30 pm

You'd typically call writeLinetype between tableLinetypes and tableEnd. Then you can use the linetype name for example for a layer (writeLayer).

Patry0t
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Re: Dashed and dotted lines on different layers

Post by Patry0t » Mon Nov 21, 2016 1:42 pm

thank you for your quick reply.
I tried something like this:

Code: Select all

	dw->tableLinetypes(3);
	dxf->writeLinetype(*dw, DL_LinetypeData("BYBLOCK", "BYBLOCK", 0, 0, 0.0));
	dxf->writeLinetype(*dw, DL_LinetypeData("BYLAYER", "BYLAYER", 0, 0, 0.0));
	dxf->writeLinetype(*dw, DL_LinetypeData("CONTINUOUS", "Filled", 0, 0, 0.0));
	/*dxf->writeLinetype(*dw, DL_LinetypeData("CONTINUOUS", "Dashed", 1, 0, 0.0));
	dxf->writeLinetype(*dw, DL_LinetypeData("CONTINUOUS", "Dashdot", 2, 0, 0.0));*/
	dw->tableEnd();

	int numberOfLayers = 3;
	dw->tableLayers(numberOfLayers);

	dxf->writeLayer(*dw,
		DL_LayerData("0", 0),
		DL_Attributes(
			std::string(""),			// leave empty
			DL_Codes::black,			// default color
			100,						// default width
			"CONTINUOUS", 1.0));        // default line style

	dxf->writeLayer(*dw,
		DL_LayerData("d", 0),
		DL_Attributes(
			std::string(""),			// leave empty
			DL_Codes::black,			// default color
			100,						// default width
			"CONTINUOUS", 1.0));       // default line style

	dxf->writeLayer(*dw,
		DL_LayerData("dd", 0),
		DL_Attributes(
			std::string(""),			// leave empty
			DL_Codes::black,			// default color
			100,						// default width
			"CONTINUOUS", 1.0));       // default line style

	dw->tableEnd();
Then I would like to draw the line according to my linetypes in LineT (111 filled, 222 dashed, 333 dashdot).

Code: Select all

dw->sectionEntities();

	// write all entities in model space:
	for (int i = 0; i < line_endpoints.size(); i++) {
		
		if (lineT[i] == 111) {
			dxf->writeLine(
				*dw,
				DL_LineData(line_endpoints[i][0],   // start point
					line_endpoints[i][1],
					0.0,
					line_endpoints[i][2],   // end point
					line_endpoints[i][3],
					0.0),
				DL_Attributes("0", 256, -1, "BYLAYER", 1.0));
		}
		else if (lineT[i] == 222) {
			dxf->writeLine(
				*dw,
				DL_LineData(line_endpoints[i][0],   // start point
					line_endpoints[i][1],
					0.0,
					line_endpoints[i][2],   // end point
					line_endpoints[i][3],
					0.0),
				DL_Attributes("d", 256, -1, "BYLAYER", 1.0));
		}
		else {
			dxf->writeLine(
				*dw,
				DL_LineData(line_endpoints[i][0],   // start point
					line_endpoints[i][1],
					0.0,
					line_endpoints[i][2],   // end point
					line_endpoints[i][3],
					0.0),
				DL_Attributes("dd", 256, -1, "BYLAYER", 1.0));
		}
	}

	dw->sectionEnd();
But this not seem to work :\

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andrew
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Re: Dashed and dotted lines on different layers

Post by andrew » Mon Nov 21, 2016 1:47 pm

You have two linetypes named "CONTINUOUS".
All of your layers use linetype "CONTINUOUS".
Also, you are not actually defining any dashed patterns in the DL_LinetypeData constructors.

Patry0t
Junior Member
Posts: 10
Joined: Mon Nov 21, 2016 12:52 pm

Re: Dashed and dotted lines on different layers

Post by Patry0t » Mon Nov 21, 2016 2:51 pm

yes, I tried something like this:

Code: Select all

dw->tableLinetypes(5);
	dxf->writeLinetype(*dw, DL_LinetypeData("BYBLOCK", "BYBLOCK", 0, 0, 0.0));
	dxf->writeLinetype(*dw, DL_LinetypeData("BYLAYER", "BYLAYER", 0, 0, 0.0));
	dxf->writeLinetype(*dw, DL_LinetypeData("CONTINUOUS", "Filled", 0, 0, 0.0));
	dxf->writeLinetype(*dw, DL_LinetypeData("DASHED", "Dashed", 0, 10, 3, 0.111000111));
	dxf->writeLinetype(*dw, DL_LinetypeData("DASHDOT", "Dashdot", 0, 10, 5, 0.111010111));
dw->tableEnd();
But that gives me compile error, because the argument list of LinetypeData is not matched. When I give one less argument it also stops working.

Is it something with the versions? I use AC1015 version just like in the documentation, I dont get it.. I just want to use the version that matches the documentation on your website here, but that gives me compile error.

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andrew
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Re: Dashed and dotted lines on different layers

Post by andrew » Mon Nov 21, 2016 3:33 pm

The last parameter of the DL_LinetypeData constructor is an array of doubles with the desired dash lengths (positive) and gap lengths (negative), e.g.

double dashes[2] = { 2.5, -0.5 };

For a dash of 2.5 Millimeter followed by a gap of 0.5 Millimeter, etc.

Patry0t
Junior Member
Posts: 10
Joined: Mon Nov 21, 2016 12:52 pm

Re: Dashed and dotted lines on different layers

Post by Patry0t » Mon Nov 21, 2016 4:05 pm

something like this? This compiles at least, thanks!

Code: Select all

double dashes[2] = { 2.5, -0.5 };
	dw->tableLinetypes(3);
	dxf.writeLinetype(*dw, DL_LinetypeData("BYBLOCK", "BYBLOCK", 0, 0, 0.0));
	dxf.writeLinetype(*dw, DL_LinetypeData("BYLAYER", "BYLAYER", 0, 0, 0.0));
	dxf.writeLinetype(*dw, DL_LinetypeData("CONTINUOUS", "Filled", 0, 0, 0.0));
	dxf.writeLinetype(*dw, DL_LinetypeData("DASHED", "Dashed", 0, 10, 10, dashes));
	dxf.writeLinetype(*dw, DL_LinetypeData("DASHDOT", "Dashdot", 0, 10, 10, dashes));
	dw->tableEnd();
This compiles now, which is good, but than I still have only continuous lines when I open it in AutoCAD :\

Patry0t
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Posts: 10
Joined: Mon Nov 21, 2016 12:52 pm

Re: Dashed and dotted lines on different layers

Post by Patry0t » Tue Nov 22, 2016 12:59 pm

any idea why?

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andrew
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Re: Dashed and dotted lines on different layers

Post by andrew » Tue Nov 22, 2016 1:03 pm

Did you also pass those linetype names to writeLayer (can you post your adjusted code)?

Patry0t
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Posts: 10
Joined: Mon Nov 21, 2016 12:52 pm

Re: Dashed and dotted lines on different layers

Post by Patry0t » Tue Nov 22, 2016 3:13 pm

Code: Select all

double dashes[2] = { 2.5, -0.5 };
	double dashdot[2] = { 5.0, -0.5 };
	dw->tableLinetypes(5);
	dxf.writeLinetype(*dw, DL_LinetypeData("BYBLOCK", "BYBLOCK", 0, 0, 0.0));
	dxf.writeLinetype(*dw, DL_LinetypeData("BYLAYER", "BYLAYER", 0, 0, 0.0));
	dxf.writeLinetype(*dw, DL_LinetypeData("CONTINUOUS", "Filled", 0, 0, 0.0));
	dxf.writeLinetype(*dw, DL_LinetypeData("DASHED", "Dashed", 0, 10, 5, dashes));
	dxf.writeLinetype(*dw, DL_LinetypeData("DASHDOT", "Dashdot", 0, 10, 5, dashdot));
	dw->tableEnd();

	int numberOfLayers = 3;
	dw->tableLayers(numberOfLayers);

	dxf.writeLayer(*dw,
		DL_LayerData("0", 0),
		DL_Attributes(
			std::string(""),			// leave empty
			DL_Codes::black,			// default color
			100,						// default width
			"CONTINUOUS", 1.0));        // default line style

	dxf.writeLayer(*dw,
		DL_LayerData("d", 0),
		DL_Attributes(
			std::string(""),			// leave empty
			DL_Codes::red,			// default color
			100,						// default width
			"DASHED", 1.0));       // default line style

	dxf.writeLayer(*dw,
		DL_LayerData("dd", 0),
		DL_Attributes(
			std::string(""),			// leave empty
			DL_Codes::blue,			// default color
			100,						// default width
			"DASHDOT", 1.0));       // default line style

	dw->tableEnd();

	dw->tableStyle(1);
		dxf.writeStyle(*dw, DL_StyleData("standard", 0, 2.5, 1.0, 0.0, 0, 2.5, "txt", ""));
	dw->tableEnd();

	dxf.writeView(*dw);
	dxf.writeUcs(*dw);

	dw->tableAppid(1);
		dxf.writeAppid(*dw, "ACAD");
	dw->tableEnd();

	dxf.writeDimStyle(*dw, 1, 1, 1, 1, 1);

	//FOR
	//minden egyenesre egy blokk
	dxf.writeBlockRecord(*dw);
	dxf.writeBlockRecord(*dw, "myblock1");
	dw->tableEnd();

	dw->sectionEnd();

	dw->sectionBlocks();
	dxf.writeBlock(*dw, DL_BlockData("*Model_Space", 0, 0.0, 0.0, 0.0));
	dxf.writeEndBlock(*dw, "*Model_Space");
	dxf.writeBlock(*dw, DL_BlockData("*Paper_Space", 0, 0.0, 0.0, 0.0));
	dxf.writeEndBlock(*dw, "*Paper_Space");
	dxf.writeBlock(*dw, DL_BlockData("*Paper_Space0", 0, 0.0, 0.0, 0.0));
	dxf.writeEndBlock(*dw, "*Paper_Space0");

	
	dxf.writeBlock(*dw, DL_BlockData("myblock1", 0, 0.0, 0.0, 0.0));
	dxf.writeEndBlock(*dw, "myblock1");
	dw->sectionEnd();

	dw->sectionEntities();

	// write all entities in model space:
	for (int i = 0; i < line_endpoints.size(); i++) {
		
		if (lineT[i] == 111) {
			dxf.writeLine(
				*dw,
				DL_LineData(line_endpoints[i][0],   // start point
					line_endpoints[i][1],
					0.0,
					line_endpoints[i][2],   // end point
					line_endpoints[i][3],
					0.0),
				DL_Attributes("0", 256, -1, "BYLAYER", 1.0));
		}
		else if (lineT[i] == 222) {
			dxf.writeLine(
				*dw,
				DL_LineData(line_endpoints[i][0],   // start point
					line_endpoints[i][1],
					0.0,
					line_endpoints[i][2],   // end point
					line_endpoints[i][3],
					0.0),
				DL_Attributes("d", 256, -1, "BYLAYER", 1.0));
		}
		else {
			dxf.writeLine(
				*dw,
				DL_LineData(line_endpoints[i][0],   // start point
					line_endpoints[i][1],
					0.0,
					line_endpoints[i][2],   // end point
					line_endpoints[i][3],
					0.0),
				DL_Attributes("dd", 256, -1, "BYLAYER", 1.0));
		}
	}

	dw->sectionEnd();
So I would like to have 3 layers here, '0', 'd' and 'dd'. 0 layer contains continuous lines, d layer contains dashed lines and dd layer the dashdot lines.
But for some reason this prints out all the lines in continuous.

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andrew
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Joined: Fri Mar 30, 2007 6:07 am

Re: Dashed and dotted lines on different layers

Post by andrew » Tue Nov 22, 2016 8:41 pm

Could you please attach your DXF file written with the above code?

Patry0t
Junior Member
Posts: 10
Joined: Mon Nov 21, 2016 12:52 pm

Re: Dashed and dotted lines on different layers

Post by Patry0t » Wed Nov 23, 2016 12:00 am

yes, sure but its now updated with circles and arcs too. But I changed nothing on the lines, so its still the problem with dashes and dashdot.
Attachments
myDxf.dxf
(11.51 KiB) Downloaded 86 times

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andrew
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Re: Dashed and dotted lines on different layers

Post by andrew » Wed Nov 23, 2016 8:49 am

If you look at the linetype definitions in the DXF file, you can see that there is a problem with the dash pattern definition:

0
LTYPE
5
31
100
AcDbSymbolTableRecord
100
AcDbLinetypeTableRecord
2
DASHED
70
0
3
Dashed
72
65
73
10
40
6.0
49
2.5 <-- dash: OK
74
0
49
-0.5 <-- gap: OK
74
0
49
-92559631349317830736831783200707727132248687965119994463780864.0 <-- NOT OK.
74
0
49
-92559631349317830736831783200707727132248687965119994463780864.0 <-- NOT OK.
...

Reason: the number of dashes passed to the DL_LinetypeData constructor is wrong and so is the pattern length:

Should probably be:
DL_LinetypeData("DASHED", "Dashed", 0, 2, 3.0, dashes)
DL_LinetypeData("DASHDOT", "Dashdot", 0, 2, 5.5, dashdot)

Patry0t
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Posts: 10
Joined: Mon Nov 21, 2016 12:52 pm

Re: Dashed and dotted lines on different layers

Post by Patry0t » Wed Nov 23, 2016 4:37 pm

Thank You, finally I understand it. You helped me a lot!

I could solve it like this:

Code: Select all

double dashes[2] = { 2.5, -0.5 };
	double dashdot[4] = { 5.0, -0.25, 0.25, -0.25};
	dw->tableLinetypes(5);
	dxf.writeLinetype(*dw, DL_LinetypeData("BYBLOCK", "BYBLOCK", 0, 0, 0.0));
	dxf.writeLinetype(*dw, DL_LinetypeData("BYLAYER", "BYLAYER", 0, 0, 0.0));
	dxf.writeLinetype(*dw, DL_LinetypeData("CONTINUOUS", "Filled", 0, 0, 0.0));
	dxf.writeLinetype(*dw, DL_LinetypeData("DASHED", "Dashed", 0, 2, 3.0, dashes));
	dxf.writeLinetype(*dw, DL_LinetypeData("DASHDOT", "Dashdot", 0, 4, 5.75, dashdot));
	dw->tableEnd();

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