iOS Line drawing tool(画线类, 直线和 折线)

#import <Foundation/Foundation.h>

#import <UIKit/UIKit.h>

@interface DrawLine : NSObject

/* 折线 */

+ (void)drawCenter:(UIImageView *)imageView withBeginX:(CGFloat)Bx withBeginY:(CGFloat)By withEndX:(CGFloat)Ex withEndY:(CGFloat)Ey withLineWidth:(CGFloat)width withColorR:(CGFloat)r G:(CGFloat)g B:(CGFloat)b Alpha:(CGFloat)a;

/* 直线 */

+ (void)drawLineCenter:(UIView *)view withBeginX:(CGFloat)Bx withBeginY:(CGFloat)By withEndX:(CGFloat)Ex withEndY:(CGFloat)Ey withLineWidth:(CGFloat)width withColorR:(CGFloat)r G:(CGFloat)g B:(CGFloat)b Alpha:(CGFloat)a;

/* param 1 : 画线部位

 * param 2 : 起始点的X

 * param 3 : 起始点的Y

 * param 4 : 结束点的X

 * param 5 : 结束点得Y

 * param 6 ~ 9 : 线的颜色和透明度

 */

@end

#import "DrawLine.h"

@implementation DrawLine

+ (void)drawCenter:(UIImageView *)imageView withBeginX:(CGFloat)Bx withBeginY:(CGFloat)By withEndX:(CGFloat)Ex withEndY:(CGFloat)Ey withLineWidth:(CGFloat)width withColorR:(CGFloat)r G:(CGFloat)g B:(CGFloat)b Alpha:(CGFloat)a

{

    

    UIGraphicsBeginImageContext(imageView.frame.size);

    [imageView.imagedrawInRect:CGRectMake(0,0, imageView.frame.size.width, imageView.frame.size.height)];

    

    

    CGContextSetLineCap(UIGraphicsGetCurrentContext(),kCGLineCapRound);

    CGContextSetLineWidth(UIGraphicsGetCurrentContext(), width); /* 线宽 */

    CGContextSetAllowsAntialiasing(UIGraphicsGetCurrentContext(),YES);

    CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), r, g, b, a); /* 颜色 */

    CGContextBeginPath(UIGraphicsGetCurrentContext());

    CGContextMoveToPoint(UIGraphicsGetCurrentContext(), Bx, By); /* 起点坐标 */

    CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), Ex, Ey);  /* 终点坐标 */

    CGContextStrokePath(UIGraphicsGetCurrentContext());

    imageView.image =UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    

}

+ (void)drawLineCenter:(UIView *)view withBeginX:(CGFloat)Bx withBeginY:(CGFloat)By withEndX:(CGFloat)Ex withEndY:(CGFloat)Ey withLineWidth:(CGFloat)width withColorR:(CGFloat)r G:(CGFloat)g B:(CGFloat)b Alpha:(CGFloat)a

{

    UIImageView *imageView=[[UIImageViewalloc] initWithFrame:view.frame];

    [view addSubview:imageView];

    view.backgroundColor = [UIColorclearColor];

    

    UIGraphicsBeginImageContext(imageView.frame.size);

    [imageView.imagedrawInRect:CGRectMake(0,0, imageView.frame.size.width, imageView.frame.size.height)];

    

    CGContextSetLineCap(UIGraphicsGetCurrentContext(),kCGLineCapRound);

    CGContextSetLineWidth(UIGraphicsGetCurrentContext(), width); /* 线宽 */

    CGContextSetAllowsAntialiasing(UIGraphicsGetCurrentContext(),YES);

    CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), r, g, b, a); /* 颜色 */

    CGContextBeginPath(UIGraphicsGetCurrentContext());

    CGContextMoveToPoint(UIGraphicsGetCurrentContext(), Bx, By); /* 起点坐标 */

    CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), Ex, Ey);  /* 终点坐标 */

    CGContextStrokePath(UIGraphicsGetCurrentContext());

    imageView.image =UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    

    [imageView release];

}

@end