DXFR2000

Operate AutoCAD DXF file without AutoCAD environment. compatible with AutoCAD R2000 at least.

Supported ENTITIES:
----ARC
----CIRCLE
----LINE
----LWPOLYLINE
----POINT
----TEXT
----ELLIPSE

Vesatile Contructors:

void AddEllipse()
AddEllipse(empty) default Ellipse.

void AddEllipse(double x_value, double y_value, double ratio_value)
AddEllipse(x_value,y_value,ratio_value)

void AddEllipse(double x_value, double y_value, double z_value, double ratio_value)
AddEllipse(x_value,y_value,z_value,ratio_value)

void AddEllipse(double xc_value, double yc_value, double xl_value, double yl_value, double ratio_value)
AddEllipse(xc_value, yc_value, zc_value, xl_value, yl_value, zl_value, ratio_value)

void AddEllipse(double x_value, double y_value, double z_value, double ratio_value, double sAngle_value, double eAngle_value)
AddEllipse(x_value,y_value,z_value,ratio_value,sAngle_value,eAngle_value)

void AddEllipse(double xc_value, double yc_value, double xl_value, double yl_value, double ratio_value, double sAngle_value, double eAngle_value)
AddEllipse(xc_value, yc_value, zc_value, xl_value, yl_value, zl_value, ratio_value, sAngle_value,eAngle_value)

void AddEllipse(double xc_value, double yc_value, double zc_value, double xl_value, double yl_value, double zl_value, double ratio_value, double sAngle_value, double eAngle_value)
AddEllipse(xc_value, yc_value, zc_value, xl_value, yl_value, zl_value, ratio_value, sAngle_value,eAngle_value)

void AddEllipse(EntEllipse oneEllipse)
AddEllipse(oneEllipse)

void AddEllipse(wPoint2D lP, double ratio_value)
AddEllipse(lP,ratio_value)

void AddEllipse(wPoint2D cP, double Radius, double radius)
AddEllipse(cP,Radius,radius)

void AddEllipse(wPoint2D lP, double ratio_value, double sAngle_value, double eAngle_value)
AddEllipse(lP,ratio_value,sAngle_value,eAngle_value)

void AddEllipse(wPoint2D cP, wPoint2D lP, double ratio_value)
AddEllipse(cP,lP,ratio_value)

void AddEllipse(wPoint2D cP, wPoint2D lP, double ratio_value, double sAngle_value, double eAngle_value)
AddEllipse(cP,lP,ratio_value,sAngle_value,eAngle_value)

void AddEllipse(wPoint2D Pc, wPoint2D Pa, wPoint2D Pb)
AddEllipse(Pc,Pa,Pb)

void AddEllipse(wPoint cP, wPoint lP, double ratio_value)
AddEllipse(cP,lP,ratio_value)

void AddEllipse(wPoint cP, wPoint lP, double ratio_value, double sAngle_value, double eAngle_value)
AddEllipse(cP,lP,ratio_value,sAngle_value,eAngle_value)

Example one:

/**
 * CircleTanCircle(PC,Pc,R,r,type)
 * <pre>Draw tangent graphics
 * @param PC - the length of the rectangle ;
 * @param Pc - center point of the Big Circle;
 * @param R - the radius of big Circle;
 * @param r - the radius of small Circle
 * @param type - 1:two lines,one arc;
 *               2:two lines,one circle;
 *               3:two lines;
 *               4:one line(small angle);
 *               5:one line(big angle);
 *	</pre>
*/
public void CircleTanCircle(wPoint2D PC,double R,wPoint2D Pc,double r,int type){
	double alpha,beita;
	double angleA,angleB;
	double l,l_tan;
	wPoint2D PA,PB,Pa,Pb;
	
	l = Pc.GetDistance(PC);
	if (l > (R + r)){
		l_tan = Math.sqrt(Math.pow(l,2)-Math.pow(R-r,2));
		beita = Math.asin((R-r)/l);
		
		alpha = Pc.Angle2P(PC);
		angleA = alpha - beita - Math.PI/2;
		angleB = alpha + beita + Math.PI/2;
		
		Pa = new wPoint2D();
		Pa.x = Pc.x + r * Math.cos(angleA);
		Pa.y = Pc.y + r * Math.sin(angleA);
		
		Pb = new wPoint2D();
		Pb.x = Pc.x + r * Math.cos(angleB);
		Pb.y = Pc.y + r * Math.sin(angleB);
		
		PA = new wPoint2D();
		PA.x = PC.x + R * Math.cos(angleA);
		PA.y = PC.y + R * Math.sin(angleA);
		
		PB = new wPoint2D();
		PB.x = PC.x + R * Math.cos(angleB);
		PB.y = PC.y + R * Math.sin(angleB);
		
		switch (type){
			case 1:
				this.AddLine(Pa,PA);
				this.AddLine(Pb,PB);
				this.AddArc(PC,PA,PB);
				this.AddArc(Pc,Pb,Pa);
				break;
			case 2:
				this.AddLine(Pa,PA);
				this.AddLine(Pb,PB);
				this.AddCircle(Pc,r);
				this.AddCircle(PC,R);
				break;
			case 3:
				this.AddLine(Pa,PA);
				this.AddLine(Pb,PB);
				break;
			case 4:
				this.AddLine(Pa,PA);
				break;
			case 5:
				this.AddLine(Pb,PB);
				break;
			default:
				break;
		}
	}
}

Now, this project supports chinese character set(use system truetype font Arial.ttf). Thanks to JadeChong https://github.com/JadeChong
Unicode convert： This is mine.\U+4e2d\U+6587\U+6d4b\U+8bd5

This project supports 180W+ Entities.(lines,Tested succeed with AutoCAD R2008,the DXF file's size is 331M, which can not be deal with notepad++, you need ultraedit.In this case, the handle of entities section is more than 1B7812)

Thanks to :
https://github.com/VVS1864/open_dxf_lib for handle
Ycad for entities' definetion.