本文主要是介绍IOS 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,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
- - (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\n部门:ERP事业部\n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);
- */
- }
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