"Go" IOS Quartz various drawing graphics usage-achieve picture, write text, draw line, ellipse, rectangle, prism, etc.

Only override Drawrect:if perform custom drawing.
An empty implementation adversely affects performance during animation.
-(void) DrawRect: (cgrect) rect
{
Cgcontextref context = Uigraphicsgetcurrentcontext ();



/*no.1 Draw a line

Cgcontextsetrgbstrokecolor (context, 0.5, 0.5, 0.5, 0.5);//Line Color
Cgcontextmovetopoint (Context, 20, 20);
Cgcontextaddlinetopoint (context, 200,20);
Cgcontextstrokepath (context);
*/



/*no.2 Write text

Cgcontextsetlinewidth (context, 1.0);
Cgcontextsetrgbfillcolor (context, 0.5, 0.5, 0.5, 0.5);
Uifont *font = [Uifont boldsystemfontofsize:18.0];
[@] Company: BEIJING China Soft Technology Co., LTD. \ n Department: ERP business unit \ n Name: Mcliang "Drawinrect:cgrectmake ((), 280, Withfont:font];
*/


/*no.3 draw a square shape without a border

Cgcontextsetrgbfillcolor (context, 0, 0.25, 0, 0.5);
Cgcontextfillrect (Context, CGRectMake (2, 2, 270, 270));
Cgcontextstrokepath (context);
*/


/*no.4 draw a square border

Cgcontextsetrgbstrokecolor (context, 0.5, 0.5, 0.5, 0.5);//Line Color
Cgcontextsetlinewidth (context, 2.0);
Cgcontextaddrect (Context, CGRectMake (2, 2, 270, 270));
Cgcontextstrokepath (context);
*/


/*no.5 draw a square background color

CGCONTEXTTRANSLATECTM (context, 0.0f, self.bounds.size.height);
CGCONTEXTSCALECTM (context, 1.0f, -1.0f);
Uigraphicspushcontext (context);
Cgcontextsetlinewidth (context,320);
Cgcontextsetrgbstrokecolor (context, 250.0/255, 250.0/255, 210.0/255, 1.0);
Cgcontextstrokerect (context, CGRectMake (0, 0, 320, 460));
Uigraphicspopcontext ();
*/

/*no.6 Ellipse

CGRect arect= CGRectMake (80, 80, 160, 100);
Cgcontextsetrgbstrokecolor (context, 0.6, 0.9, 0, 1.0);
Cgcontextsetlinewidth (context, 3.0);
Cgcontextaddellipseinrect (context, arect); Elliptic
Cgcontextdrawpath (context, kcgpathstroke);
*/

/*no.7
Cgcontextbeginpath (context);
Cgcontextsetrgbstrokecolor (context, 0, 0, 1, 1);
Cgcontextmovetopoint (context, 100, 100);
Cgcontextaddarctopoint (Context, 50, 100, 50, 150, 50);
Cgcontextstrokepath (context);
*/

/*no.8 Gradient
Cgcontextclip (context);
Cgcolorspaceref RGB = Cgcolorspacecreatedevicergb ();
CGFloat colors[] =
{
204.0/255.0, 224.0/255.0, 244.0/255.0, 1.00,
29.0/255.0, 156.0/255.0, 215.0/255.0, 1.00,
0.0/255.0, 50.0/255.0, 126.0/255.0, 1.00,
};
Cggradientref gradient = cggradientcreatewithcolorcomponents
(RGB, colors, NULL, sizeof (colors)/(sizeof (COLORS[0)));
Cgcolorspacerelease (RGB);
Cgcontextdrawlineargradient (Context, Gradient,cgpointmake
(0.0,0.0), Cgpointmake (0.0,self.frame.size.height),
Kcggradientdrawsbeforestartlocation);
*/


/* No.9 four lines draw a square
Draw Line
Uicolor *acolor = [Uicolor colorwithred:0 green:1.0 blue:0 alpha:0];
Cgcontextsetrgbstrokecolor (context, 1.0, 0, 0, 1.0);
Cgcontextsetfillcolorwithcolor (context, acolor.cgcolor);
Cgcontextsetlinewidth (context, 4.0);
Cgpoint Apoints[5];
Apoints[0] =cgpointmake (60, 60);
APOINTS[1] =cgpointmake (260, 60);
APOINTS[2] =cgpointmake (260, 300);
APOINTS[3] =cgpointmake (60, 300);
APOINTS[4] =cgpointmake (60, 60);
Cgcontextaddlines (Context, apoints, 5);
Cgcontextdrawpath (context, kcgpathstroke); Start drawing lines
*/



/* No.10
Uicolor *acolor = [Uicolor colorwithred:0 green:1.0 blue:0 alpha:0];
Cgcontextsetrgbstrokecolor (context, 1.0, 0, 0, 1.0);
Cgcontextsetfillcolorwithcolor (context, acolor.cgcolor);
Elliptic
CGRect arect= CGRectMake (80, 80, 160, 100);
Cgcontextsetrgbstrokecolor (context, 0.6, 0.9, 0, 1.0);
Cgcontextsetlinewidth (context, 3.0);
Cgcontextsetfillcolorwithcolor (context, acolor.cgcolor);
Cgcontextaddrect (context, rect); Rectangular
Cgcontextaddellipseinrect (context, arect); Elliptic
Cgcontextdrawpath (context, kcgpathstroke);
*/



/* No.11
Draw a solid circle

Cgcontextfillellipseinrect (Context, CGRectMake (95, 95, 100.0, 100));
*/



/*no.12
Draw a Diamond
Cgcontextsetlinewidth (context, 2.0);
Cgcontextsetstrokecolorwithcolor (context, [Uicolor Bluecolor]. Cgcolor);
Cgcontextmovetopoint (context, 100, 100);
Cgcontextaddlinetopoint (context, 150, 150);
Cgcontextaddlinetopoint (context, 100, 200);
Cgcontextaddlinetopoint (context, 50, 150);
Cgcontextaddlinetopoint (context, 100, 100);
Cgcontextstrokepath (context);
*/

/*no.13 Draw a rectangle
Cgcontextsetlinewidth (context, 2.0);

Cgcontextsetstrokecolorwithcolor (context, [Uicolor Bluecolor]. Cgcolor);

CGRect rectangle = CGRectMake (60,170,200,80);

Cgcontextaddrect (context, rectangle);

Cgcontextstrokepath (context);
*/


/* Ellipse
Cgcontextsetlinewidth (context, 2.0);

Cgcontextsetstrokecolorwithcolor (context, [Uicolor Bluecolor]. Cgcolor);

CGRect rectangle = CGRectMake (60,170,200,80);

Cgcontextaddellipseinrect (context, rectangle);

Cgcontextstrokepath (context);
*/

/* Fills a path in red:

Cgcontextmovetopoint (context, 100, 100);
Cgcontextaddlinetopoint (context, 150, 150);
Cgcontextaddlinetopoint (context, 100, 200);
Cgcontextaddlinetopoint (context, 50, 150);
Cgcontextaddlinetopoint (context, 100, 100);
Cgcontextsetfillcolorwithcolor (context, [Uicolor Redcolor]. Cgcolor);
Cgcontextfillpath (context);
*/

/* Fill a red rectangle with a blue edge
Cgcontextsetlinewidth (context, 2.0);
Cgcontextsetstrokecolorwithcolor (context, [Uicolor Bluecolor]. Cgcolor);
CGRect rectangle = CGRectMake (60,170,200,80);
Cgcontextaddrect (context, rectangle);
Cgcontextstrokepath (context);
Cgcontextsetfillcolorwithcolor (context, [Uicolor Redcolor]. Cgcolor);
Cgcontextfillrect (context, rectangle);
*/

/* Arc Drawing
The arc is drawn by specifying two tangency points, as well as an angle, called cgcontextaddarctopoint ()
Cgcontextsetlinewidth (context, 2.0);
Cgcontextsetstrokecolorwithcolor (context, [Uicolor Bluecolor]. Cgcolor);
Cgcontextmovetopoint (context, 100, 100);
Cgcontextaddarctopoint (context, 100,200, 300,200, 100);
Cgcontextstrokepath (context);
*/


/*
Draw a Bézier curve
The Bezier curve is drawn by moving a starting point, then through two control points, and a stop point, called the Cgcontextaddcurvetopoint () function.
Cgcontextsetlinewidth (context, 2.0);

Cgcontextsetstrokecolorwithcolor (context, [Uicolor Bluecolor]. Cgcolor);

Cgcontextmovetopoint (context, 10, 10);

Cgcontextaddcurvetopoint (context, 0, 50, 300, 250, 300, 400);

Cgcontextstrokepath (context);
*/

/* Draw two Bézier curves

Cgcontextsetlinewidth (context, 2.0);

Cgcontextsetstrokecolorwithcolor (context, [Uicolor Bluecolor]. Cgcolor);

Cgcontextmovetopoint (context, 10, 200);

Cgcontextaddquadcurvetopoint (context, 150, 10, 300, 200);

Cgcontextstrokepath (context);
*/

/* Draw Dashed lines
Cgcontextsetlinewidth (context, 5.0);

Cgcontextsetstrokecolorwithcolor (context, [Uicolor Bluecolor]. Cgcolor);

CGFloat dasharray[] = {2,6,4,2};

Cgcontextsetlinedash (Context, 3, Dasharray, 4);//Skip 3 and draw a dashed line, so just start with 6-(3-2) = 5 Virtual dots

Cgcontextmovetopoint (context, 10, 200);

Cgcontextaddquadcurvetopoint (context, 150, 10, 300, 200);

Cgcontextstrokepath (context);
*/
/* Draw a picture
nsstring* ImagePath = [[NSBundle mainbundle] pathforresource:@ "dog" oftype:@ "png"];
uiimage* myimageobj = [[UIImage alloc] initwithcontentsoffile:imagepath];
[Myimageobj drawatpoint:cgpointmake (0, 0)];
[Myimageobj drawinrect:cgrectmake (0, 0, 320, 480)];

NSString *s = @ "My puppy";

[s Drawatpoint:cgpointmake (0) Withfont:[uifont systemfontofsize:34.0]];
*/

/*
NSString *path = [[NSBundle mainbundle] pathforresource:@ "dog" oftype:@ "png"];
UIImage *img = [UIImage Imagewithcontentsoffile:path];
CGIMAGEREF image = img. Cgimage;
Cgcontextsavegstate (context);
CGRect touchrect = CGRectMake (0, 0, img.size.width, img.size.height);
Cgcontextdrawimage (context, touchrect, image);
Cgcontextrestoregstate (context);
*/


/*nsstring *path = [[NSBundle mainbundle] pathforresource:@ "dog" oftype:@ "png"];
UIImage *img = [UIImage Imagewithcontentsoffile:path];
CGIMAGEREF image = img. Cgimage;
Cgcontextsavegstate (context);

CGCONTEXTROTATECTM (context, M_PI);
CGCONTEXTTRANSLATECTM (context,-img.size.width,-img.size.height);

CGRect touchrect = CGRectMake (0, 0, img.size.width, img.size.height);
Cgcontextdrawimage (context, touchrect, image);
Cgcontextrestoregstate (context); */

/*
NSString *path = [[NSBundle mainbundle] pathforresource:@ "dog" oftype:@ "png"];
UIImage *img = [UIImage Imagewithcontentsoffile:path];
CGIMAGEREF image = img. Cgimage;

Cgcontextsavegstate (context);

Cgaffinetransform myaffine = cgaffinetransformmakerotation (M_PI);
Myaffine = Cgaffinetransformtranslate (Myaffine,-img.size.width,-img.size.height);
CGCONTEXTCONCATCTM (context, myaffine);

CGCONTEXTROTATECTM (context, M_PI);
CGCONTEXTTRANSLATECTM (context,-img.size.width,-img.size.height);

CGRect touchrect = CGRectMake (0, 0, img.size.width, img.size.height);
Cgcontextdrawimage (context, touchrect, image);
Cgcontextrestoregstate (context);
*/
}

"Go" IOS Quartz various drawing graphics usage-achieve picture, write text, draw line, ellipse, rectangle, prism, etc.