IOS View Drawing

From: http://blog.sina.com.cn/s/blog_79a120e501018c2n.html

Uiview method:

-(Void) drawrect :( cgrect) rect

Obtain the current context:

 

Cgcontextref context = uigraphicsgetcurrentcontEXT ();

Get the starting point and size of the current bounds:

 

Self. bounds. Origin

 

Self. bounds. Size

Set the line width and fill line color of the drawing:

 

Cgcontextsetlinewidth (context, 5.0 );

[[Uicolor bluecolor] setstroke];

Additional call Method for drawing:

You need to push the context before using the context, and then pop it. In this way, the context outside will not be damaged, and I will do anything in it.

 

Uigraphicspushcontext (context );

Cgcontextbeginpath (context );

Cgcontextaddarc (context, p. x, P. Y, radius, 0, 2 * m_pi, yes );

// Cgcontextaddcurvetopoint(Context, mouthcp1.x, mouthcp1.y, mouthcp2.x, mouthcp2.y, // mouthend. X, mouthend. Y) are the same routines ..

Cgcontextstrokepath (context );

Uigraphicspopcontext ();

Inherit uiview and convert uiview into sub-view. Uibezierpath class drawing. Drawing with rectangular coordinates

-(Void) drawrect :( cgrect) rect

{

// Rectangular drawing Area

 
Cgrect arectangle = cgrectmake (0.0,
0.0, 40.0, 40.0 );

// Define a rectangular path

  Uibezierpath * Path = [uibezierpath bezierpathwithrect: arectangle];

// Draw the rectangular path

 [Pathstroke];

// Draw an ellipse in the area

  Path = [Uibezierpathbezierpathwithovalinrect: Arectangle];

// Elliptical Filling

 [Pathfill];

// Define a start path

  Uibezierpath * startpath = [uibezierpath bezierpath];

 // Start to draw a star

 [Startpathmovetopoint: cgpointmake (40.0,
(0.0)];

  [StartpathAddlinetopoint: cgpointmake (30.0,
(30.0)];

  [StartpathAddlinetopoint: cgpointmake (0.0,
(30.0)];

  [StartpathAddlinetopoint: cgpointmake (20.0,
(50.0)];

  [StartpathAddlinetopoint: cgpointmake (10.0,
(80.0)];

  [StartpathAddlinetopoint: cgpointmake (40.0,
(60.0)];

  [StartpathAddlinetopoint: cgpointmake (70.0,
(80.0)];

  [StartpathAddlinetopoint: cgpointmake (60.0,
(50.0)];

  [StartpathAddlinetopoint: cgpointmake (80.0,
(30.0)];

  [StartpathAddlinetopoint: cgpointmake (50.0,
(30.0)];

 [Startpathclosepath];

// Obtain the current environment

  Cgcontextref context = uigraphicsgetcurrentcontEXT ();

// Save the current environment for future recovery

  Cgcontextsavegstate (context );

// Change the starting point of the coordinate to (100,100)

  Cgcontexttranslatectm (context,
100,100 );

// Turns the current color into yellow

  Uicolor * fillcolor = [uicolor yellowcolor];

 [Fillcolorsetfill];

// The star is yellow.

 [Startpathfill];

 // Change the starting point of the coordinate to the starting point of (100,100). Note: This is the relative displacement of the current (100,100), so it is (200,200) relative to the entire view)

  Cgcontexttranslatectm (context,
100,100 );

// Rotate coordinates 45 degrees

  Cgcontextrotatectm (context,
3.14/4 );

// Change the current color to green

 Fillcolor = [uicolor
Greencolor];

 [Fillcolorsetfill];

// Draw the outline of the pentagram into a color

 [Startpathstroke];

// Star filling

 [Startpathfill];

// Restore the context. Of course, it is the one saved before the restoration. 

  Cgcontextrestoregstate (context );

// Save the current context

  Cgcontextsavegstate (context );

  Cgcontexttranslatectm (context,
50,250 );

 [Startpathfill];

  Cgcontextrestoregstate (context );

   

}