core graphics绘图1

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1画线

A：

CGContextSetRGBStrokeColor(context,1.0,0.0, 0.0,1.0);设置画笔的颜色

CGContextSetLineWidth(context,10.0);设置画笔宽度

CGContextMoveToPoint(context,10.0,30.0 + baseHeight);将笔移动到某一点

CGContextAddLineToPoint(context,310.0,30.0 + baseHeight);画一条线到某一点

CGContextStrokePath(context);用画笔将以上路径画出来

CGPoint addLines[] ={

CGPointMake(10.0,90.0 + baseHeight),

CGPointMake(70.0,60.0 + baseHeight),

CGPointMake(130.0,90.0+baseHeight),

CGPointMake(190.0,60.0+baseHeight),

CGPointMake(250.0,90.0+baseHeight),

CGPointMake(310.0,60.0+baseHeight),

};添加点的数组

CGContextSetStrokeColorWithColor(context, [UIColor cyanColor].CGColor);设置画笔的颜色

CGContextSetLineWidth(context,3);设置画笔宽度

CGContextAddLines(context, addLines,sizeof(addLines)/sizeof(addLines[0]));在多个点之间画线

CGContextStrokePath(context);用画笔将以上路径画出来

CGPoint strokeSegments[] ={

CGPointMake(10.0,150.0+baseHeight),

CGPointMake(70.0,120.0+baseHeight),

CGPointMake(130.0,150.0+baseHeight),

CGPointMake(190.0,120.0+baseHeight),

CGPointMake(250.0,150.0+baseHeight),

CGPointMake(310.0,120.0+baseHeight),

};

CGContextSetLineWidth(context,5);

CGContextStrokeLineSegments(context, strokeSegments,sizeof(strokeSegments)/sizeof(strokeSegments[0]));

画奇数点的线

CGContextSetRGBStrokeColor(context,1.0,1.0, 1.0, 1.0);

CGContextSaveGState(context);保存上下文状态1

CGContextMoveToPoint(context,40.0,30.0+baseHeight);

CGContextAddLineToPoint(context,280.0,30.0 + baseHeight);

CGContextSetLineWidth(context,self.width);

CGContextSetLineCap(context,self.cap);设置线的两端的样式

CGContextStrokePath(context);画线

CGContextRestoreGState(context);恢复到状态1之前的状态

CGContextSaveGState(context);状态2

CGContextMoveToPoint(context,40.0,190.0+baseHeight);

CGContextAddLineToPoint(context,160.0,70.0 +baseHeight);

CGContextAddLineToPoint(context,280.0,190.0 +baseHeight);

CGContextSetLineWidth(context,self.width);

CGContextSetLineCap(context,self.cap);设置线两端的样式

CGContextSetLineJoin(context,self.join);设置连接线的样式

CGContextStrokePath(context);

CGContextRestoreGState(context);恢复到状态2之前的状态

CGContextSetRGBStrokeColor(context,1.0,0.0,0.0,1.0);

CGContextSetLineDash(context,self.dashPhase,dashPattern,dashCount);//画虚线设置线的相隔度信息

CGContextMoveToPoint(context,10.0,20.0+baseHeight);

CGContextAddLineToPoint(context,310.0,20.0+baseHeight);

CGContextMoveToPoint(context,160.0,30.0+baseHeight);

CGContextAddLineToPoint(context,160.0,130.0+baseHeight);

CGContextAddRect(context,CGRectMake(10.0,30.0+baseHeight,100.0,100.0));画矩形

CGContextAddEllipseInRect(context,CGRectMake(210.0,30.0+baseHeight,100.0,100.0));画矩形的内切圆

CGContextSetLineWidth(context,5.0);

CGContextStrokePath(context);

2 画多边形

CGContextSetRGBStrokeColor(context,1.0,1.0,1.0,1.0);画笔颜色

CGContextSetRGBFillColor(context,0.0,0.0, 1.0,1.0);填充的颜色

CGContextSetLineWidth(context,2.0);画笔的宽度

CGContextAddRect(context,CGRectMake(30.0,30.0 +baseHeight,60.0,60.0));画矩形

CGContextStrokePath(context);用画笔画矩形边框是画笔颜色

CGContextStrokeRect(context,CGRectMake(30.0,120.0+baseHeight,60.0,60.0));用画笔话举行

CGContextStrokeRectWithWidth(context,CGRectMake(30.0,210.0+baseHeight,60.0,60.0), 10.0);

CGContextSaveGState(context);

CGContextSetRGBStrokeColor(context,1.0,0.0, 0.0,1.0);

CGContextStrokeRectWithWidth(context,CGRectMake(30.0,210.0+baseHeight,60.0,60.0), 2.0);

CGContextRestoreGState(context);

CGRect rects[] = {

CGRectMake(120.0,30.0+baseHeight,60.0,60.0),

CGRectMake(120.0,120.0+baseHeight,60.0,60.0),

CGRectMake(120.0,210.0+baseHeight,60.0,60.0),

};

CGContextAddRects(context, rects,sizeof(rects)/sizeof(rects[0]));同时画多个矩形

CGContextStrokePath(context);

CGContextAddRect(context,CGRectMake(210.0,30.0+baseHeight,60.0,60.0));

CGContextFillPath(context);使用填充色填充矩形

CGContextFillRect(context,CGRectMake(210.0,120.0+baseHeight,60.0,60.0));填充矩形相当于以上两步结合

CGContextSetRGBStrokeColor(context,1.0,1.0,1.0,1.0);笔的颜色

CGContextSetRGBFillColor(context,0.0,0.0, 1.0,1.0);填充色

CGContextSetLineWidth(context,2.0);

CGPoint center;

center =CGPointMake(90.0,90.0);

CGContextMoveToPoint(context, center.x, center.y + 60.0+baseHeight);

for(int i =1; i < 5; ++i)

{

CGFloat x =60.0 *sinf(i *4.0 *M_PI /5.0);

CGFloat y =60.0 *cosf(i *4.0 *M_PI /5.0);

CGContextAddLineToPoint(context, center.x + x, center.y + y+baseHeight);

}

CGContextClosePath(context);结束画线会自动的将最后一条路径连接

center =CGPointMake(210.0,90.0);

CGContextMoveToPoint(context, center.x, center.y + 60.0+baseHeight);

for(int i =1; i < 6; ++i)

{

CGFloat x =60.0 *sinf(i *2.0 *M_PI /6.0);

CGFloat y =60.0 *cosf(i *2.0 *M_PI /6.0);

CGContextAddLineToPoint(context, center.x + x, center.y + y+baseHeight);

}

CGContextClosePath(context);

CGContextDrawPath(context,self.drawingMode);绘画路径

路径绘画模式：

enum CGPathDrawingMode {

kCGPathFill,//非绕零规则看非绕零与奇偶的blog

kCGPathEOFill,//奇偶规则

kCGPathStroke,

kCGPathFillStroke,

kCGPathEOFillStroke

};

3画圆形弧形

CGContextSetRGBStrokeColor(context,1.0,1.0,1.0,1.0);

CGContextSetRGBFillColor(context,1.0,0.0, 0.0,1.0);

CGContextSetLineWidth(context,2.0);

CGContextAddEllipseInRect(context,CGRectMake(30.0,30.0+baseHeight,60.0,60.0));画椭圆矩形内切圆

CGContextStrokePath(context);

CGContextStrokeEllipseInRect(context,CGRectMake(30.0,120.0+baseHeight,60.0,60.0));画笔画椭圆

CGContextFillEllipseInRect(context,CGRectMake(30.0,210.0+baseHeight,60.0,60.0));填充椭圆

CGContextAddArc(context,150.0,60.0+baseHeight,30.0,0.0, M_PI/2,false);画圆弧 false 逆时针方向

CGContextStrokePath(context);

CGContextAddArc(context,150.0,60.0+baseHeight,30.0,3.0*M_PI/2.0,M_PI,true);ture 顺时针方向

CGContextStrokePath(context);

CGContextAddArc(context,150.0,150.0+baseHeight,30.0,0.0, M_PI/2.0,false);

CGContextAddArc(context,150.0,150.0+baseHeight,30.0,3.0*M_PI/2.0,M_PI,true);

CGContextStrokePath(context);中间线相连

CGContextAddArc(context,150.0,240.0+baseHeight,30.0,0.0, M_PI/2.0,false);

CGContextAddArc(context,150.0,240.0+baseHeight,30.0,M_PI,3.0*M_PI/2.0,false);

CGContextStrokePath(context);

// Stroke an arc using AddArcToPoint

CGPoint p[3] ={

CGPointMake(210.0,30.0+baseHeight),

CGPointMake(210.0,60.0+baseHeight),

CGPointMake(240.0,60.0+baseHeight),

};

CGContextMoveToPoint(context, p[0].x, p[0].y);

CGContextAddArcToPoint(context, p[1].x, p[1].y, p[2].x, p[2].y,30.0);以半径画两点的弧线

CGContextStrokePath(context);

CGContextSetRGBStrokeColor(context,1.0,0.0, 0.0,1.0);

CGContextAddLines(context, p,sizeof(p)/sizeof(p[0]));

CGContextStrokePath(context);画直线

CGContextSetRGBStrokeColor(context,1.0,1.0, 1.0,1.0);

CGRect rrect =CGRectMake(210.0,90.0+baseHeight,60.0,60.0);

CGFloat radius =10.0;

CGFloat minx =CGRectGetMinX(rrect), midx =CGRectGetMidX(rrect), maxx = CGRectGetMaxX(rrect);

CGFloat miny =CGRectGetMinY(rrect), midy =CGRectGetMidY(rrect), maxy = CGRectGetMaxY(rrect);

CGContextMoveToPoint(context, minx, midy);

// Add an arc through 2 to 3

CGContextAddArcToPoint(context, minx, miny, midx, miny, radius);

// Add an arc through 4 to 5

CGContextAddArcToPoint(context, maxx, miny, maxx, midy, radius);

// Add an arc through 6 to 7

CGContextAddArcToPoint(context, maxx, maxy, midx, maxy, radius);

// Add an arc through 8 to 9

CGContextAddArcToPoint(context, minx, maxy, minx, midy, radius);

// Close the path

CGContextClosePath(context);

// Fill & stroke the path

CGContextDrawPath(context,kCGPathFillStroke);绘画路径绘画线并且填充颜色

4 用图片画图{

CGRect imageRect;

imageRect.origin =CGPointMake(8.0,8.0+baseHeight);

imageRect.size =CGSizeMake(64.0,64.0);

CGContextDrawImage(context, imageRect,self.image);将图片画在矩形内

CGContextClipToRect(context,CGRectMake(0.0,80.0+baseHeight,self.bounds.size.width,self.bounds.size.height));

imageRect.origin =CGPointMake(32.0,112.0+baseHeight);

CGContextDrawTiledImage(context, imageRect,self.image);

CGContextSetRGBFillColor(context,1.0,0.0, 0.0,0.5);

CGContextFillRect(context, imageRect);

// And stroke the clipped area

CGContextSetLineWidth(context,10.0);

CGContextSetRGBStrokeColor(context,1.0,0.0, 0.0,1.0);

CGContextStrokeRect(context,CGContextGetClipBoundingBox(context));

}

- (CGImageRef)image{

if (_image ==NULL){

NSString *imagePath = [[NSBundlemainBundle]pathForResource:@"Demo"ofType:@"png"];

UIImage *img = [UIImageimageWithContentsOfFile:imagePath];

_image =CGImageRetain(img.CGImage);

}

return_image;

}

PDF文档{

CGContextTranslateCTM(context,0.0,self.bounds.size.height);以屏幕的高度调换坐标系 iOS LU 00 OSLD ：00

CGContextScaleCTM(context,1.0, -1.0);y的负方向

CGPDFPageRef page =CGPDFDocumentGetPage(self.pdfDocument,1);获取pdf的页数信息

CGContextSaveGState(context);

CGAffineTransform pdfTransform =CGPDFPageGetDrawingTransform(page,kCGPDFCropBox,self.bounds,0,true);

CGContextConcatCTM(context, pdfTransform);

CGContextDrawPDFPage(context, page);绘画pdf

CGContextRestoreGState(context);

}

-(CGPDFDocumentRef)pdfDocument{

if (_pdfDocument ==NULL){

CFURLRef pdfURL =CFBundleCopyResourceURL(CFBundleGetMainBundle(),CFSTR("Quartz.pdf"),NULL,NULL);

_pdfDocument =CGPDFDocumentCreateWithURL((CFURLRef)pdfURL);

CFRelease(pdfURL);

}

return_pdfDocument;

}

3绘画文本

CGContextSetRGBFillColor(context,1.0,1.0, 1.0, 1.0);

CGContextSetRGBStrokeColor(context,1.0,0.0, 0.0,1.0);

CGContextSelectFont(context,"Helvetica",36.0,kCGEncodingMacRoman);设置字体

CGContextSetTextMatrix(context,CGAffineTransformMakeScale(1.0, -1.0));转换矩阵

CGContextSetTextDrawingMode(context,kCGTextFill);绘画模式

CGContextShowTextAtPoint(context,10.0,30.0+baseHeight,kTextString,kTextStringLength);

CGContextSetTextDrawingMode(context,kCGTextStroke);

CGContextShowTextAtPoint(context,10.0,70.0+baseHeight,kTextString,kTextStringLength);

CGContextSetTextDrawingMode(context,kCGTextFillStroke);

CGContextShowTextAtPoint(context,10.0,110.0+baseHeight,kTextString,kTextStringLength);

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