各种画图:

Quartz 各种绘制图形用法—实现画图片、写文字、画线、椭圆、矩形、棱形等

// Only override drawRect: if you perform custom drawing.

// An empty implementation adversely affects performance during animation.

- (void)drawRect:(CGRect)rect

{

    CGContextRef context = UIGraphicsGetCurrentContext();







    /*NO.1画一条线



     CGContextSetRGBStrokeColor(context, 0.5, 0.5, 0.5, 0.5);//线条颜色

     CGContextMoveToPoint(context, 20, 20);

     CGContextAddLineToPoint(context, 200,20);

     CGContextStrokePath(context);

    */







    /*NO.2写文字



    CGContextSetLineWidth(context, 1.0);

    CGContextSetRGBFillColor (context, 0.5, 0.5, 0.5, 0.5);

    UIFont  *font = [UIFont boldSystemFontOfSize:18.0];

    [@"公司：北京中软科技股份有限公司
部门：ERP事业部
姓名：McLiang" drawInRect:CGRectMake(20, 40, 280, 300) withFont:font];

    */





    /*NO.3画一个正方形图形 没有边框



    CGContextSetRGBFillColor(context, 0, 0.25, 0, 0.5);

    CGContextFillRect(context, CGRectMake(2, 2, 270, 270));

    CGContextStrokePath(context);

    */





    /*NO.4画正方形边框



    CGContextSetRGBStrokeColor(context, 0.5, 0.5, 0.5, 0.5);//线条颜色

    CGContextSetLineWidth(context, 2.0);

    CGContextAddRect(context, CGRectMake(2, 2, 270, 270));

    CGContextStrokePath(context);

    */





    /*NO.5画方形背景颜色



    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椭圆



     CGRect aRect= CGRectMake(80, 80, 160, 100);

     CGContextSetRGBStrokeColor(context, 0.6, 0.9, 0, 1.0);

     CGContextSetLineWidth(context, 3.0);

     CGContextAddEllipseInRect(context, aRect); //椭圆

     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渐变

    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])*4));

    CGColorSpaceRelease(rgb);

    CGContextDrawLinearGradient(context, gradient,CGPointMake

                                (0.0,0.0) ,CGPointMake(0.0,self.frame.size.height),

                                kCGGradientDrawsBeforeStartLocation);

     */





    /* NO.9四条线画一个正方形

    //画线

        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); //开始画线

     */







    /*  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);

    //椭圆

    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); //矩形

    CGContextAddEllipseInRect(context, aRect); //椭圆

    CGContextDrawPath(context, kCGPathStroke);

     */







    /*  NO.11

     画一个实心的圆



     CGContextFillEllipseInRect(context, CGRectMake(95, 95, 100.0, 100));

    */







    /*NO.12

     画一个菱形

    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 画矩形

    CGContextSetLineWidth(context, 2.0);



    CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);



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



    CGContextAddRect(context, rectangle);



    CGContextStrokePath(context);

     */





    /*椭圆

    CGContextSetLineWidth(context, 2.0);



    CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);



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



    CGContextAddEllipseInRect(context, rectangle);



    CGContextStrokePath(context);

     */



    /*用红色填充了一段路径:



    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);

    */



    /*填充一个蓝色边的红色矩形

    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);

    */



    /*画弧

     //弧线的是通过指定两个切点，还有角度，调用CGContextAddArcToPoint()绘制

    CGContextSetLineWidth(context, 2.0);

    CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);

    CGContextMoveToPoint(context, 100, 100);

    CGContextAddArcToPoint(context, 100,200, 300,200, 100);

    CGContextStrokePath(context);

    */





    /*

    绘制贝兹曲线

    //贝兹曲线是通过移动一个起始点，然后通过两个控制点,还有一个中止点，调用CGContextAddCurveToPoint() 函数绘制

    CGContextSetLineWidth(context, 2.0);



    CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);



    CGContextMoveToPoint(context, 10, 10);



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



    CGContextStrokePath(context);

     */



    /*绘制二次贝兹曲线



      CGContextSetLineWidth(context, 2.0);



      CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);



      CGContextMoveToPoint(context, 10, 200);



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



      CGContextStrokePath(context);

     */



    /*绘制虚线

    CGContextSetLineWidth(context, 5.0);



    CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);



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



    CGContextSetLineDash(context, 3, dashArray, 4);//跳过3个再画虚线，所以刚开始有6-（3-2）=5个虚点



    CGContextMoveToPoint(context, 10, 200);



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



    CGContextStrokePath(context);

    */

/*绘制图片

    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 = @"我的小狗";



    [s drawAtPoint:CGPointMake(100, 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);

*/
}