//

//  DLView.m

//  Demo0223

//

//  Created by wiseman on 16/2/23.

//  Copyright (c) 2016年 wiseman. All rights reserved.

//

#import "DLView.h"

@implementation DLView

/*

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

// An empty implementation adversely affects performance during animation.

- (void)drawRect:(CGRect)rect {

    // Drawing code

}

*/

//绘图只能在此方法中调用，否则无法得到当前图形上下文

-(void)drawRect:(CGRect)rect{

    //1.取得图形的上下文对象

    CGContextRef context = UIGraphicsGetCurrentContext();

    /*

    //2.绘制路径

    CGContextMoveToPoint(context, 20, 50);

    CGContextAddLineToPoint(context, 20, 100);

    CGContextAddLineToPoint(context, 300, 100);

    //封闭路径

    CGContextClosePath(context);

    //3.设置图形上下文属性

    [[UIColor redColor] setStroke];//设置红色边框

    [[UIColor blueColor] setFill];//设置蓝色填充

    //[[UIColor blueColor]set];//同时设置填充和边框色

    //4.绘制路径

    CGContextDrawPath(context, kCGPathFillStroke);

     */

    /*

        绘制矩形

     */

//    [self drawRectWithContext:context];

    /*

        绘制椭圆

     */

//    [self drawEllipseWithContext:context];

    /*

        绘制弧形

     */

//    [self drawArc:context];

    /*

        绘制贝塞尔曲线

     */

//    [self drawCurve:context];

    /*

        文字绘制

     */

    [self drawText:context];

}

#pragma mark - 绘制文字

-(void)drawText:(CGContextRef)context{

    //绘制到指定的区域内容

    NSString *str=@"Star Walk is the most beautiful stargazing app you’ve ever seen on a mobile device. It will become your go-to interactive astro guide to the night sky, following your every movement in real-time and allowing you to explore over 200, 000 celestial bodies with extensive information about stars and constellations that you find.";

    CGRect rect= CGRectMake(, , , );

    UIFont *font=[UIFont systemFontOfSize:];//设置字体

    UIColor *color=[UIColor redColor];//字体颜色

    NSMutableParagraphStyle *style=[[NSMutableParagraphStyle alloc]init];//段落样式

    NSTextAlignment align=NSTextAlignmentLeft;//对齐方式

    style.alignment=align;

    [str drawInRect:rect withAttributes:@{NSFontAttributeName:font,NSForegroundColorAttributeName:color,NSParagraphStyleAttributeName:style}];

}

#pragma mark - 绘制贝塞尔曲线

-(void)drawCurve:(CGContextRef)context{

    //绘制曲线

    CGContextMoveToPoint(context, , );//移动到起始位置

    /*绘制二次贝塞尔曲线

     c:图形上下文

     cpx:控制点x坐标

     cpy:控制点y坐标

     x:结束点x坐标

     y:结束点y坐标

     CGContextAddQuadCurveToPoint(CGContextRef c, CGFloat cpx, CGFloat cpy, CGFloat x, CGFloat y)

     */

    CGContextAddQuadCurveToPoint(context, , , , );

    [[UIColor clearColor] setFill];

    [[UIColor blackColor] setStroke];

    /*绘制三次贝塞尔曲线

     c:图形上下文

     cp1x:第一个控制点x坐标

     cp1y:第一个控制点y坐标

     cp2x:第二个控制点x坐标

     cp2y:第二个控制点y坐标

     x:结束点x坐标

     y:结束点y坐标

     */

    CGContextMoveToPoint(context, , );

    CGContextAddCurveToPoint(context, , , , , , );

    [[UIColor redColor] setStroke];

    [[UIColor clearColor] setFill];

    CGContextDrawPath(context, kCGPathFillStroke);

}

#pragma mark - 绘制弧形

-(void)drawArc:(CGContextRef)context{

    //添加弧形对象

    /*

     x:中心点x坐标

     y:中心点y坐标

     radius:半径

     startAngle:起始弧度

     endAngle:终止弧度

     closewise:是否逆时针绘制，0则顺时针绘制

     CGContextAddArc(CGContextRef c, CGFloat x, CGFloat y, CGFloat radius, CGFloat startAngle, CGFloat endAngle, int clockwise)

     */

    CGContextAddArc(context, , , , , M_PI_2, );

    [[UIColor blueColor]setStroke];

    [[UIColor clearColor]setFill];

    CGContextDrawPath(context, kCGPathFillStroke);

}

#pragma mark - 绘制椭圆

-(void)drawEllipseWithContext:(CGContextRef)context{

    //添加对象，绘制椭圆（圆形）的过程首先也是创建一个矩形

    CGRect rect = CGRectMake(, , , );

    CGContextAddEllipseInRect(context, rect);

    //设置属性

    [[UIColor redColor] set];

    CGContextDrawPath(context, kCGPathFillStroke);

}

#pragma mark 绘制矩形

-(void)drawRectWithContext:(CGContextRef)context{

    //添加矩形对象

    CGRect rect=CGRectMake(, , 280.0, 50.0);

    CGContextAddRect(context,rect);

    //设置属性

    [[UIColor blueColor]set];

    //绘制

    CGContextDrawPath(context, kCGPathFillStroke);

}

#pragma mark 绘制矩形（利用UIKit的封装方法）

-(void)drawRectByUIKitWithContext:(CGContextRef)context{

    CGRect rect= CGRectMake(, , 280.0, 50.0);

    CGRect rect2=CGRectMake(, , 280.0, 50.0);

    //设置属性

    [[UIColor yellowColor]set];

    //绘制矩形,相当于创建对象、添加对象到上下文、绘制三个步骤

    UIRectFill(rect);//绘制矩形（只有填充）

    [[UIColor redColor]setStroke];

    UIRectFrame(rect2);//绘制矩形(只有边框)

}

@end