IOS繪制小黃人，對繪圖知識的一個練習

#define kTopX rect.size.width * 0.5 #define kTopRadius 80 #define kTopY 260// // HMView.m // 004-繪制小黃人 // // Created by lujun on 2021/6/11. // #import "HMView.h" @implementation HMView - (void)drawRect:(CGRect)rect{CGContextRef ctx = UIGraphicsGetCurrentContext();//畫身體[self drawBody:rect withContext:ctx];[self drawEyes:rect withContext:ctx];[self drawMouth:rect withContext:ctx];[self drawhair:rect withContext:ctx]; } -(void)drawhair:(CGRect)rect withContext:(CGContextRef) ctx{CGContextMoveToPoint(ctx, kTopX-30, kTopY-kTopRadius-30);CGContextAddLineToPoint(ctx, kTopX-20, kTopY-kTopRadius+5 );[[UIColor blackColor] set];CGContextStrokePath(ctx);CGContextMoveToPoint(ctx, kTopX-22, kTopY-kTopRadius-30);CGContextAddLineToPoint(ctx, kTopX-8, kTopY-kTopRadius+5 );[[UIColor blackColor] set];CGContextStrokePath(ctx);CGContextMoveToPoint(ctx, kTopX, kTopY-kTopRadius-30);CGContextAddLineToPoint(ctx, kTopX, kTopY-kTopRadius+5 );[[UIColor blackColor] set];CGContextStrokePath(ctx);CGContextMoveToPoint(ctx, kTopX+30, kTopY-kTopRadius-30);CGContextAddLineToPoint(ctx, kTopX+20, kTopY-kTopRadius+5 );[[UIColor blackColor] set];CGContextMoveToPoint(ctx, kTopX+22, kTopY-kTopRadius-30);CGContextAddLineToPoint(ctx, kTopX+8, kTopY-kTopRadius+5 );[[UIColor blackColor] set];CGContextStrokePath(ctx); }-(void)drawMouth:(CGRect)rect withContext:(CGContextRef) ctx{ //貝塞爾曲線//控制點CGFloat controllerX = kTopX;CGFloat controllerY = rect.size.height*0.3 + 50;//當前點CGFloat marginX = 20;CGFloat marginY = 10;CGFloat currentX = controllerX-marginX;CGFloat currentY = controllerY - marginY;CGContextMoveToPoint(ctx, currentX, currentY);//結(jié)束點CGFloat endX = controllerX + marginX;CGFloat endY = currentY;CGContextAddQuadCurveToPoint(ctx, controllerX, controllerY, endX, endY);CGContextSetLineWidth(ctx, 1);[[UIColor blackColor] set];CGContextStrokePath(ctx); }-(void)drawEyes:(CGRect)rect withContext:(CGContextRef) ctx{CGFloat startX = kTopX - kTopRadius;CGFloat startY = kTopY;CGContextMoveToPoint(ctx, startX, startY);CGFloat endX = kTopX + kTopRadius;CGFloat endY = startY;CGContextAddLineToPoint(ctx, endX, endY);CGContextSetLineWidth(ctx, 18);[[UIColor blackColor] set];CGContextStrokePath(ctx);//畫左邊第一支大眼睛CGFloat leftRaduis = 30;CGFloat leftX = kTopX - leftRaduis;CGFloat leftY = kTopY;CGContextAddArc(ctx, leftX, leftY, leftRaduis, 0, 2 * M_PI, 0);[[UIColor grayColor] set];CGContextFillPath(ctx);//畫右邊第一支大眼睛CGFloat rightRaduis = 30;CGFloat rightX = kTopX + leftRaduis;CGFloat rightY = kTopY;CGContextAddArc(ctx, rightX, rightY, rightRaduis, 0, 2 * M_PI, 0);[[UIColor grayColor] set];CGContextFillPath(ctx);//畫左邊二眼睛CGFloat leftSmallRaduis = 20;CGFloat leftSmallX = leftX;CGFloat leftSmallY = leftY;CGContextAddArc(ctx, leftSmallX, leftSmallY, leftSmallRaduis, 0, 2 * M_PI, 0);[[UIColor whiteColor] set];CGContextFillPath(ctx);//畫右邊二眼睛CGFloat rightSmallRaduis = 20;CGFloat rightSmallX = rightX;CGFloat rightSmallY = rightY;CGContextAddArc(ctx, rightSmallX, rightSmallY, rightSmallRaduis, 0, 2 * M_PI, 0);[[UIColor whiteColor] set];CGContextFillPath(ctx);//畫左邊三眼睛CGFloat leftSsmallRaduis = 8;CGFloat leftSsmallX = leftX +8;CGFloat leftSsmallY = leftY;CGContextAddArc(ctx, leftSsmallX, leftSsmallY, leftSsmallRaduis, 0, 2 * M_PI, 0);[[UIColor colorWithRed:88/255.0 green:23/255.0 blue:9/255.0 alpha:1] set];CGContextFillPath(ctx);//畫右邊三眼睛CGFloat rightSsmallRaduis = 8;CGFloat rightSsmallX = rightX -8;CGFloat rightSsmallY = rightY;CGContextAddArc(ctx, rightSsmallX, rightSsmallY, rightSsmallRaduis, 0, 2 * M_PI, 0);[[UIColor colorWithRed:88/255.0 green:23/255.0 blue:9/255.0 alpha:1] set];CGContextFillPath(ctx);//畫左邊四眼睛CGContextAddArc(ctx, leftSsmallX, leftSsmallY, 4, 0, 2 * M_PI, 0);[[UIColor blackColor] set];CGContextFillPath(ctx);//畫右邊四眼睛CGContextAddArc(ctx, rightSsmallX, rightSsmallY, 4, 0, 2 * M_PI, 0);[[UIColor blackColor] set];CGContextFillPath(ctx);//畫左邊五眼睛，白點CGContextAddArc(ctx, leftSsmallX-3, leftSsmallY-3, 2, 0, 2 * M_PI, 0);[[UIColor whiteColor] set];CGContextFillPath(ctx);//畫右邊五眼睛，白點CGContextAddArc(ctx, rightSsmallX-3, rightSsmallY-3, 2, 0, 2 * M_PI, 0);[[UIColor whiteColor] set];CGContextFillPath(ctx); }-(void)drawBody:(CGRect)rect withContext:(CGContextRef) ctx{//畫上半圓弧CGFloat topX=kTopX;CGFloat topY = kTopY;CGFloat radius = kTopRadius;CGContextAddArc(ctx, topX, topY, radius, -M_PI, 0, 0);//畫下半圓弧CGFloat middX = topX + radius;CGFloat middY = topY + 120;CGContextAddLineToPoint(ctx, middX, middY);CGFloat bottomRadius = radius;CGFloat bottomX = topX;CGFloat bottomY = middY;CGContextAddArc(ctx, bottomX, bottomY, bottomRadius, 0, M_PI, 0);CGContextClosePath(ctx);[[UIColor colorWithRed:252/255.0 green:215/255.0 blue:0 alpha:1.0] set];CGContextFillPath(ctx); } @end

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