Cgcontextaddarctopoint and cgcontextaddarc

Cgcontextaddarctopoint

The Code is as follows:

 

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1. Cgcontextref context = uigraphicsgetcurrentcontext ();
2. Cgcontextsetrgbstrokecolor (context, 1, 0, 1, 1 );
3. Cgcontextmovetopoint (context, 150,50 );
4. Cgcontextaddlinetopoint (context, 100,80 );
5. Cgcontextaddlinetopoint (context, 130,150 );
7. Cgcontextmovetopoint (context,); // the starting point of the arc.
8. Cgcontextaddarctopoint (context, 100,80, 130,150, 50 );
9. Cgcontextstrokepath (context );

 

 

Cgcontextmovetopoint (context, 150,50 );//Starting Point of the arc

Cgcontextaddarctopoint (context, 100,80, 130,150, 50 );

From (150,50) (100,80) draw a line and then (100,80) (130,150) draw a line from these two lines (infinitely extending)And radius50. You can determine an arc,

While

Cgcontextaddarc (context, 100,100, 30, 0, m_pi, 1 );

Relatively simple,(100,100) is the coordinate of the center,30 is the radius ,(0,M_pi) is the start and end angles,1 is clockwise,0 is counter-clockwise

From (150,50) (100,80) draw a line and then (100,80) (130,150) draw a line from these two lines (infinitely extending)And radius50 to determine an arc

 

Cgcontextaddarctopoint and cgcontextaddarc