IOS: drawing, ios drawing

IOS: drawing, ios drawing

1. UIBezierPath (besell curve)

1-1), in the override drawRect: Used in the Method

It is not difficult to use it. Generally, UIBezierPath. h is used. It is worth noting that the color settings are as follows:

// Set the line segment and fill color [[UIColor redColor] set]; // set the line segment color [[UIColor orangeColor] setStroke]; // set the fill color [[UIColor yellowColor] setFill];

The following is the code in the learning process.

-(Void) drawRect :( CGRect) rect {// rectangular UIBezierPath * path1 = [UIBezierPath bezierPathWithRect: CGRectMake (20, 20, 50, 50)]; [[UIColor grayColor] setStroke]; [path1 stroke]; // circle UIBezierPath * path2 = [UIBezierPath bezierPathWithOvalInRect: CGRectMake (100, 20, 50, 50)]; [[UIColor blueColor] setFill]; [path2 fill]; [UIColor redColor] setStroke]; [path2 stroke]; // cut 4 rounded corners UIBezierPath * path3 = [UIBezierPath B EzierPathWithRoundedRect: CGRectMake (200, 20, 50, 50) cornerRadius: 15.0]; [[UIColor greenColor] setStroke]; [path3 stroke]; // Cut 1-4 rounded corners (the last parameter is cornerRadii, as if it were size. is width effective ?) UIBezierPath * path4 = [UIBezierPath paths: CGRectMake (300, 20, 50, 50) byRoundingCorners: UIRectCornerTopLeft | export cornerRadii: CGSizeMake (15.0, 35.0)]; [[UIColor whiteColor] setStroke]; [path4 stroke]; // arc UIBezierPath * path5 = [UIBezierPath bezierPathWithArcCenter: CGPointMake (50,120) radius: 25.0 startAngle: M_PI endAngle: m_PI/4 clockwise: YES]; [[UIColor yellowColor] setStroke]; [path5 stroke]; // draw a straight line UIBezierPath * path6 = [UIBezierPath bezierPath]; [path6 setLineWidth: 3.0]; [path6 moveToPoint: CGPointMake (100,100)]; [path6 addLineToPoint: CGPointMake (150,100)]; [path6 addLineToPoint: CGPointMake (150,150)]; [path6 addLineToPoint: CGPointMake (100,150)]; [path6 addLineToPoint: CGPointMake (100,100)]; [path6 addLineToPoint: CGPointMake (200,125)]; [path6 addLineToPoint: CGPointMake (150,150)]; [path6 closePath]; path6.usesEvenOddFillRule = YES; [[UIColor grayColor] setFill]; [path6 fill]; [UIColor redColor] setStroke]; [path6 stroke]; // beibezierpath * path7 = [UIBezierPath bezierPath]; [path7 setLineWidth: 5.0]; [[UIColor orangeColor] setStroke]; [path7 moveToPoint: CGPointMake (200,100)]; [path7 addCurveToPoint: CGPointMake (300,100) controlPoint1: CGPointMake (250,150) controlPoint2: CGPointMake (275, 50)]; [path7 stroke]; // beibezierpath * path8 = [UIBezierPath bezierPath]; [path8 setLineWidth: 5.0]; [[UIColor purpleColor] setStroke]; [path8 moveToPoint: CGPointMake (200,150)]; [path8 addQuadCurveToPoint: CGPointMake (300,150) controlPoint: CGPointMake (250,200)]; [path8 stroke]; // arc UIBezierPath * path9 = [UIBezierPath bezierPath] with a center to the starting angle; [path9 setLineWidth: 5.0]; [[UIColor brownColor] setStroke]; [path9 moveToPoint: CGPointMake (50,200)]; [path9 addArcWithCenter: CGPointMake (50,200) radius: 25.0 startAngle: 0.0 endAngle: M_PI clockwise: YES]; [path9 stroke]; // dotted line UIBezierPath * path10 = [UIBezierPath bezierPath]; [path10 setLineWidth: 5.0]; [[UIColor whiteColor] setStroke]; [path10 moveToPoint: CGPointMake (10,300)]; [path10 addLineToPoint: CGPointMake (SCREEN_WIDTH-10,300)]; CGFloat lineDash [] = {10.0, 2.0, 5.0, 5.0}; // odd solid line, even line, starting phase offset [path10 setLineDash: lineDash count: 4 phase: 0]; [path10 stroke];}

 

1-2). Canvas is required for use in common methods. Use CAShapeLayer.

Note: 1. Set the line width, color, fill, and so on by CAShapeLayer, and UIBezierPath only completes path painting.

2. The CAShapeLayer size can be set to SCREEN. BOUNDS. The UIBezierPath is automatically cropped after the line is drawn. If it is not closed, it automatically connects the start point and end point.

　　　　

The following is the code in the learning process.

-(Void) drawTest {// rectangular CGRect rect1 = {20, 20, 50, 50}; UIBezierPath * path1 = [UIBezierPath bezierPathWithRect: rect1]; CAShapeLayer * shapeLayer1 = [[CAShapeLayer alloc] init]; shapeLayer1.position = self. layer. position; shapeLayer1.bounds = self. layer. bounds; shapeLayer1.path = path1.CGPath; shapeLayer1.fillColor = [UIColor grayColor]. CGColor; [self. layer addSublayer: shapeLayer1]; // round CGRect rect2 = {100, 20, 50, 50}; UIBezierPath * path2 = [UIBezierPath bezierPathWithOvalInRect: rect2]; CAShapeLayer * shapeLayer2 = [[CAShapeLayer alloc] init]; shapeLayer2.position = self. layer. position; shapeLayer2.bounds = self. layer. bounds; shapeLayer2.path = path2.CGPath; shapeLayer2.fillColor = [UIColor blueColor]. CGColor; shapeLayer2.strokeColor = [UIColor orangeColor]. CGColor; shapeLayer2.strokeStart = 0.0; shapeLayer2.strokeEnd = 0.7; shapeLayer2.lineWidth = 3.0; [self. layer addSublayer: shapeLayer2]; // specifies the baseline ** path3 = [UIBezierPath bezierPath]; [path3 moveToPoint: CGPointMake (100,100)]; [path3 addLineToPoint: CGPointMake (150,100)]; [path3 addLineToPoint: CGPointMake (150,150)]; [path3 addLineToPoint: CGPointMake (100,150)]; [path3 addLineToPoint: CGPointMake (100,100)]; [path3 addLineToPoint: CGPointMake (200,125)]; [path3 addLineToPoint: CGPointMake (150,150)]; CAShapeLayer * shapeLayer3 = [[CAShapeLayer alloc] init]; shapeLayer3.position = self. layer. position; shapeLayer3.bounds = self. layer. bounds; shapeLayer3.path = path3.CGPath; shapeLayer3.fillColor = [UIColor redColor]. CGColor; shapeLayer3.strokeColor = [UIColor orangeColor]. CGColor; shapeLayer3.lineWidth = 3.0; shapeLayer3.fillRule = kCAFillRuleEvenOdd; [self. layer addSublayer: shapeLayer3];}

 

 

 

Appendix:

CGContext Method

    CGContextGetTypeID(void)    CGContextSaveGState(CGContextRef cg_nullable c)    CGContextRestoreGState(CGContextRef cg_nullable c)    CGContextScaleCTM(CGContextRef cg_nullable c, CGFloat sx, CGFloat sy)    CGContextTranslateCTM(CGContextRef cg_nullable c, CGFloat tx, CGFloat ty)    CGContextRotateCTM(CGContextRef cg_nullable c, CGFloat angle)    CGContextConcatCTM(CGContextRef cg_nullable c,CGAffineTransform transform)    CGContextGetCTM(CGContextRef cg_nullable c)    CGContextSetLineWidth(CGContextRef cg_nullable c, CGFloat width)    CGContextSetLineCap(CGContextRef cg_nullable c, CGLineCap cap)    CGContextSetLineJoin(CGContextRef cg_nullable c, CGLineJoin join)    CGContextSetMiterLimit(CGContextRef cg_nullable c, CGFloat limit)    CGContextSetLineDash(CGContextRef cg_nullable c, CGFloat phase, const CGFloat * __nullable lengths, size_t count)    CGContextSetFlatness(CGContextRef cg_nullable c, CGFloat flatness)    CGContextSetAlpha(CGContextRef cg_nullable c, CGFloat alpha)    CGContextSetBlendMode(CGContextRef cg_nullable c, CGBlendMode mode)    CGContextBeginPath(CGContextRef cg_nullable c)    CGContextMoveToPoint(CGContextRef cg_nullable c,    CGContextAddLineToPoint(CGContextRef cg_nullable c, CGFloat x, CGFloat y)    CGContextAddCurveToPoint(CGContextRef cg_nullable c, CGFloat cp1x,    CGContextAddQuadCurveToPoint(CGContextRef cg_nullable c, CGFloat cpx, CGFloat cpy, CGFloat x, CGFloat y)    CGContextClosePath(CGContextRef cg_nullable c)    CGContextAddRect(CGContextRef cg_nullable c, CGRect rect)    CGContextAddRects(CGContextRef cg_nullable c, const CGRect * __nullable rects, size_t count)    CGContextAddLines(CGContextRef cg_nullable c,    CGContextAddEllipseInRect(CGContextRef cg_nullable c, CGRect rect)    CGContextAddArc(CGContextRef cg_nullable c, CGFloat x, CGFloat y, CGFloat radius, CGFloat startAngle, CGFloat endAngle, int clockwise)    CGContextAddArcToPoint(CGContextRef cg_nullable c, CGFloat x1, CGFloat y1, CGFloat x2, CGFloat y2, CGFloat radius)    CGContextAddPath(CGContextRef cg_nullable c, CGPathRef cg_nullable path)    CGContextReplacePathWithStrokedPath(CGContextRef cg_nullable c)    CGContextIsPathEmpty(CGContextRef cg_nullable c)    CGContextGetPathCurrentPoint(CGContextRef cg_nullable c)    CGContextGetPathBoundingBox(CGContextRef cg_nullable c)    CGContextCopyPath(CGContextRef cg_nullable c)    CGContextPathContainsPoint(CGContextRef cg_nullable c, CGPoint point, CGPathDrawingMode mode)    CGContextDrawPath(CGContextRef cg_nullable c, CGPathDrawingMode mode)    CGContextFillPath(CGContextRef cg_nullable c)    CGContextEOFillPath(CGContextRef cg_nullable c)    CGContextStrokePath(CGContextRef cg_nullable c)    CGContextFillRect(CGContextRef cg_nullable c, CGRect rect)    CGContextFillRects(CGContextRef cg_nullable c, const CGRect * __nullable rects, size_t count)    CGContextStrokeRect(CGContextRef cg_nullable c, CGRect rect)    CGContextStrokeRectWithWidth(CGContextRef cg_nullable c, CGRect rect, CGFloat width)    CGContextClearRect(CGContextRef cg_nullable c, CGRect rect)    CGContextFillEllipseInRect(CGContextRef cg_nullable c,CGRect rect)    CGContextStrokeEllipseInRect(CGContextRef cg_nullable c, CGRect rect)    CGContextStrokeLineSegments(CGContextRef cg_nullable c, const CGPoint * __nullable points, size_t count)    CGContextClip(CGContextRef cg_nullable c)    CGContextEOClip(CGContextRef cg_nullable c)    CGContextClipToMask(CGContextRef cg_nullable c, CGRect rect, CGImageRef cg_nullable mask)    CGContextGetClipBoundingBox(CGContextRef cg_nullable c)    CGContextClipToRect(CGContextRef cg_nullable c, CGRect rect)    CGContextClipToRects(CGContextRef cg_nullable c, const CGRect *  rects, size_t count)    CGContextSetFillColorWithColor(CGContextRef cg_nullable c, CGColorRef cg_nullable color)    CGContextSetStrokeColorWithColor(CGContextRef cg_nullable c, CGColorRef cg_nullable color)    CGContextSetFillColorSpace(CGContextRef cg_nullable c, CGColorSpaceRef cg_nullable space)    CGContextSetStrokeColorSpace(CGContextRef cg_nullable c, CGColorSpaceRef cg_nullable space)    CGContextSetFillColor(CGContextRef cg_nullable c, const CGFloat * cg_nullable components)    CGContextSetStrokeColor(CGContextRef cg_nullable c, const CGFloat * cg_nullable components)    CGContextSetFillPattern(CGContextRef cg_nullable c, CGPatternRef cg_nullable pattern, const CGFloat * cg_nullable components)    CGContextSetStrokePattern(CGContextRef cg_nullable c, CGPatternRef cg_nullable pattern, const CGFloat * cg_nullable components)    CGContextSetPatternPhase(CGContextRef cg_nullable c, CGSize phase)    CGContextSetGrayFillColor(CGContextRef cg_nullable c, CGFloat gray, CGFloat alpha)    CGContextSetGrayStrokeColor(CGContextRef cg_nullable c, CGFloat gray, CGFloat alpha)    CGContextSetRGBFillColor(CGContextRef cg_nullable c, CGFloat red, CGFloat green, CGFloat blue, CGFloat alpha)    CGContextSetRGBStrokeColor(CGContextRef cg_nullable c, CGFloat red, CGFloat green, CGFloat blue, CGFloat alpha)    CGContextSetCMYKFillColor(CGContextRef cg_nullable c, CGFloat cyan, CGFloat magenta, CGFloat yellow, CGFloat black, CGFloat alpha)    CGContextSetCMYKStrokeColor(CGContextRef cg_nullable c, CGFloat cyan, CGFloat magenta, CGFloat yellow, CGFloat black, CGFloat alpha)    CGContextSetRenderingIntent(CGContextRef cg_nullable c, CGColorRenderingIntent intent)    CGContextDrawImage(CGContextRef cg_nullable c, CGRect rect, CGImageRef cg_nullable image)    CGContextDrawTiledImage(CGContextRef cg_nullable c, CGRect rect, CGImageRef cg_nullable image)    CGContextGetInterpolationQuality(CGContextRef cg_nullable c)    CGContextSetInterpolationQuality(CGContextRef cg_nullable c, CGInterpolationQuality quality)    CGContextSetShadowWithColor(CGContextRef cg_nullable c, CGSize offset, CGFloat blur, CGColorRef __nullable color)    CGContextSetShadow(CGContextRef cg_nullable c, CGSize offset, CGFloat blur)    CGContextDrawLinearGradient(CGContextRef cg_nullable c, CGGradientRef cg_nullable gradient, CGPoint startPoint, CGPoint endPoint, CGGradientDrawingOptions options)    CGContextDrawRadialGradient(CGContextRef cg_nullable c, CGGradientRef cg_nullable gradient, CGPoint startCenter, CGFloat startRadius, CGPoint endCenter, CGFloat endRadius, CGGradientDrawingOptions options)    CGContextDrawShading(CGContextRef cg_nullable c, cg_nullable CGShadingRef shading)    CGContextSetCharacterSpacing(CGContextRef cg_nullable c, CGFloat spacing)    CGContextSetTextPosition(CGContextRef cg_nullable c, CGFloat x, CGFloat y)    CGContextGetTextPosition(CGContextRef cg_nullable c)    CGContextSetTextMatrix(CGContextRef cg_nullable c, CGAffineTransform t)    CGContextGetTextMatrix(CGContextRef cg_nullable c)    CGContextSetTextDrawingMode(CGContextRef cg_nullable c, CGTextDrawingMode mode)    CGContextSetFont(CGContextRef cg_nullable c, CGFontRef cg_nullable font)    CGContextSetFontSize(CGContextRef cg_nullable c, CGFloat size)    CGContextShowGlyphsAtPositions(CGContextRef cg_nullable c, const CGGlyph * cg_nullable glyphs, const CGPoint * cg_nullable Lpositions, size_t count)    CGContextDrawPDFPage(CGContextRef cg_nullable c, CGPDFPageRef cg_nullable page)    CGContextBeginPage(CGContextRef cg_nullable c, const CGRect * __nullable mediaBox)    CGContextEndPage(CGContextRef cg_nullable c)    CGContextRef cg_nullable CGContextRetain(CGContextRef cg_nullable c)    CGContextRelease(CGContextRef cg_nullable c)    CGContextFlush(CGContextRef cg_nullable c)    CGContextSynchronize(CGContextRef cg_nullable c)    CGContextSetShouldAntialias(CGContextRef cg_nullable c,    CGContextSetAllowsAntialiasing(CGContextRef cg_nullable c, bool allowsAntialiasing)    CGContextSetShouldSmoothFonts(CGContextRef cg_nullable c, bool shouldSmoothFonts)    CGContextSetAllowsFontSmoothing(CGContextRef cg_nullable c,    CGContextSetShouldSubpixelPositionFonts( CGContextRef cg_nullable c, bool shouldSubpixelPositionFonts)    CGContextSetAllowsFontSubpixelPositioning( CGContextRef cg_nullable c, bool allowsFontSubpixelPositioning)    CGContextSetShouldSubpixelQuantizeFonts( CGContextRef cg_nullable c, bool shouldSubpixelQuantizeFonts)    CGContextSetAllowsFontSubpixelQuantization( CGContextRef cg_nullable c, bool allowsFontSubpixelQuantization)    CGContextBeginTransparencyLayer(CGContextRef cg_nullable c, CFDictionaryRef __nullable auxiliaryInfo)    CGContextBeginTransparencyLayerWithRect( CGContextRef cg_nullable c, CGRect rect, CFDictionaryRef __nullable auxInfo)    CGContextEndTransparencyLayer(CGContextRef cg_nullable c)    CGContextGetUserSpaceToDeviceSpaceTransform(CGContextRef cg_nullable c)    CGContextConvertPointToDeviceSpace(CGContextRef cg_nullable c,    CGContextConvertPointToUserSpace(CGContextRef cg_nullable c,    CGContextConvertSizeToDeviceSpace(CGContextRef cg_nullable c,    CGContextConvertSizeToUserSpace(CGContextRef cg_nullable c, CGSize size)    CGContextConvertRectToDeviceSpace(CGContextRef cg_nullable c,    CGContextConvertRectToUserSpace(CGContextRef cg_nullable c,    CGContextSelectFont(CGContextRef cg_nullable c, const char * cg_nullable name, CGFloat size, CGTextEncoding textEncoding)    CGContextShowText(CGContextRef cg_nullable c, const char * cg_nullable string, size_t length)    CGContextShowTextAtPoint(CGContextRef cg_nullable c, CGFloat x, CGFloat y, const char * cg_nullable string, size_t length)    CGContextShowGlyphs(CGContextRef cg_nullable c, const CGGlyph * __nullable g, size_t count)    CGContextShowGlyphsAtPoint(CGContextRef cg_nullable c, CGFloat x, CGFloat y, const CGGlyph * __nullable glyphs, size_t count)    CGContextShowGlyphsWithAdvances(CGContextRef cg_nullable c, const CGGlyph * __nullable glyphs, const CGSize * __nullable advances, size_t count)    CGContextDrawPDFDocument(CGContextRef cg_nullable c, CGRect rect, CGPDFDocumentRef cg_nullable document, int page)