Quartz 2D是一个绘图框架，最近看了一下它的官方文档以及提供的的demo。看着这些资料自己做了一些小结。
1、线段的绘制 （绘制一条线段）
//获取图像上下文
CGContextRef context = UIGraphicsGetCurrentContext();
//设置线条颜色
CGContextSetRGBStrokeColor(context, .5, .5, .5, 1);
//设置线条宽度
CGContextSetLineWidth(context, 1);
//设置起点
CGContextMoveToPoint(context, 10, 60);
//设置终点
CGContextAddLineToPoint(context, 300, 90);
//闭合
CGContextStrokePath(context);
绘制多条线段
CGPoint addLines[] = {
CGPointMake(100, 100),
CGPointMake(200, 100),
CGPointMake(200, 200),
CGPointMake(100, 200),
CGPointMake(100, 100),
};
//绘制多个点的线段
CGContextAddLines(context, addLines, sizeof(addLines)/sizeof(addLines[0]));
CGContextSetLineJoin(context, kCGLineJoinRound);
CGContextStrokePath(context);
CGPoint stroleSegMents[] = {
CGPointMake(100, 300),
CGPointMake(200, 300),
CGPointMake(200, 400),
CGPointMake(100, 400),
CGPointMake(300, 300),
};
CGContextStrokeLineSegments(context, stroleSegMents, sizeof(stroleSegMents)/sizeof(stroleSegMents[0]));
线段的样式设置
CGContextRef context = UIGraphicsGetCurrentContext();
CGFloat len[] = {10,10};
CGContextSetAlpha(context, .5);
//设置线段的样式 可以通过这种方式来绘制虚线
CGContextSetLineDash(context, 10, len, sizeof(len)/sizeof(len[0]));
CGContextAddRect(context, CGRectMake(100, 100, 200, 200));
CGContextStrokePath(context);
2、矩形
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextAddRect(context, CGRectMake(100, 100, 100, 100));
CGContextFillPath(context);
//CGContextStrokePath(context);
CGContextStrokeRect(context, CGRectMake(250, 100, 100, 100));
CGRect rec[] = {
CGRectMake(100, 220, 100, 100),
CGRectMake(100, 320, 100, 100),
CGRectMake(100, 420, 100, 100),
};
CGContextAddRects(context, rec, sizeof(rec)/sizeof(rec[0]));
CGContextStrokePath(context);
CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 1.0);
CGContextSetLineWidth(context, 2.0);
CGPoint center;
center = CGPointMake(90.0, 150.0);
CGContextMoveToPoint(context, center.x, center.y + 60.0);
for(int i = 1; i < 3; ++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);
}
CGContextClosePath(context);
center = CGPointMake(210.0, 310.0);
CGContextMoveToPoint(context, center.x, center.y + 60.0);
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);
}
CGContextClosePath(context);
CGContextDrawPath(context, kCGPathEOFill);
3、弧度（圆）
CGContextRef context = UIGraphicsGetCurrentContext();
//通过矩形范围绘制
CGContextAddEllipseInRect(context, CGRectMake(60.0, 100.0, 60.0, 60.0));
CGContextStrokePath(context);
CGContextStrokeEllipseInRect(context, CGRectMake(30.0, 180.0, 60.0, 60.0));
//填充绘制
CGContextFillEllipseInRect(context, CGRectMake(30.0, 290.0, 60.0, 60.0));
/**
* 参数从左之右
图形上下文 x,y 弧度 起点弧度，终点弧度 ，是否顺时针
*/
CGContextAddArc(context, 180, 160, 100.0, -M_PI/2, M_PI, false);
CGContextStrokePath(context);
CGContextAddArc(context, 170.0, 160.0, 60.0, M_PI/4.0, M_PI, true);
CGContextStrokePath(context);
CGContextAddArc(context, 150.0, 150.0, 30.0, 0.0, M_PI/2.0, false);
CGContextAddArc(context, 150.0, 150.0, 30.0, 3.0*M_PI/2.0, M_PI, true);
CGContextStrokePath(context);
CGContextAddArc(context, 150.0, 340.0, 30.0, 0.0, M_PI/2.0, false);
CGContextAddArc(context, 150.0, 340.0, 30.0, M_PI, 3.0*M_PI/2.0, false);
CGContextStrokePath(context);
CGPoint p[3] =
{
CGPointMake(310.0, 30.0),
CGPointMake(310.0, 60.0),
CGPointMake(340.0, 60.0),
};
CGContextMoveToPoint(context, p[0].x, p[0].y);
CGContextAddArcToPoint(context, p[1].x, p[1].y, p[2].x, p[2].y, 30.0);
CGContextStrokePath(context);
CGContextSetRGBStrokeColor(context, 1.0, 0.0, 0.0, 1.0);
CGContextAddLines(context, p, sizeof(p)/sizeof(p[0]));
CGContextStrokePath(context);
CGContextSetRGBStrokeColor(context, .5, 1.0, 1.0, 1.0);
CGContextSetLineWidth(context, 2.0);
CGPoint s = CGPointMake(30.0, 320.0);
CGPoint e = CGPointMake(300.0, 320.0);
CGPoint cp1 = CGPointMake(320.0, 30.0);
CGPoint cp2 = CGPointMake(210.0, 210.0);
CGContextMoveToPoint(context, s.x, s.y);
CGContextAddCurveToPoint(context, cp1.x, cp1.y, cp2.x, cp2.y, e.x, e.y);
CGContextStrokePath(context);
CGContextSetRGBStrokeColor(context, 1.0, 0.5, 0.0, 1.0);
CGContextMoveToPoint(context, s.x, s.y);
CGContextAddLineToPoint(context, cp1.x, cp1.y);
CGContextMoveToPoint(context, e.x, e.y);
CGContextAddLineToPoint(context, cp2.x, cp2.y);
CGContextStrokePath(context);
CGContextSetRGBStrokeColor(context, .5, 1.0, 1.0, 1.0);
s = CGPointMake(30.0, 300.0);
e = CGPointMake(270.0, 300.0);
cp1 = CGPointMake(150.0, 180.0);
CGContextMoveToPoint(context, s.x, s.y);
CGContextAddQuadCurveToPoint(context, cp1.x, cp1.y, e.x, e.y);
CGContextStrokePath(context);
CGContextSetRGBStrokeColor(context, 1.0, 0.0, 0.0, 1.0);
CGContextMoveToPoint(context, s.x, s.y);
CGContextAddLineToPoint(context, cp1.x, cp1.y);
CGContextStrokePath(context);
4 、通过图片绘制
CGContextRef context = UIGraphicsGetCurrentContext();
//翻转坐标系
CGContextTranslateCTM(context, 0.0, self.frame.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
CGImageRef img = [UIImage imageNamed:@"1024x1024"].CGImage;
CGContextDrawImage(context, CGRectMake(30, 80, 60, 60), img);
CGContextDrawTiledImage(context, CGRectMake(30, 80, 60, 60), img);
CGContextStrokePath(context);
5、通过pdf文件绘制
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(context, 0.0, self.frame.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
CFURLRef pdfURL = CFBundleCopyResourceURL(CFBundleGetMainBundle(),CFSTR("input_pdf.pdf"),NULL,NULL);
CGPDFDocumentRef document = CGPDFDocumentCreateWithURL(pdfURL);
CFRelease(pdfURL);
CGPDFPageRef page = CGPDFDocumentGetPage(document, size_page);
CGAffineTransform pdfTransform = CGPDFPageGetDrawingTransform(page, kCGPDFCropBox, self.bounds, 0, true);
CGContextConcatCTM(context, pdfTransform);
CGContextDrawPDFPage(context, page);
时间： 2024-10-24 19:05:10