Cocoa API解説(macOS/iOS)

iOS , Mac アプリケーション開発のために使われる主要フレームワークの日本語情報です。

目次

rotateByRadians:

Index>Foundation>NSAffineTransform

変換マトリックスの回転角度をラジアンでセットします
-(void)rotateByRadians:(float)angle:

解説

変換マトリックスの回転角度をラジアンでセットします。
角度は反時計回りに増えていきます。
(NSAffineTransformクラス、10.3までのAppKitから10.4からFoundationに変更)

ラジアンはdegrees*PI/180
//PIを3.14...と定義

#define PI 3.14159265358979323846

//関数定義degrees*PI/180がradians
static inline double radians(double degrees) { return degrees * PI / 180; }

返り値

( void )

なし

引数

( float )angle

角度(ラジアン

クラス

NSAffineTransform

Instance Methods

使用可能

10.0

参照

- rotateByDegrees
- scaleBy:
- scaleXBy:yBy:
- translateXBy:yBy:

例文

#pragma mark -rotateByDegrees:
- (IBAction)method004:(id)sender {
    
    
    
    //make bezier path
	NSBezierPath *thePath1 = [NSBezierPath bezierPath];
	
    //make affin transform
    NSAffineTransform *affin = [NSAffineTransform transform];
	//NSAffineTransform *affin2 = [NSAffineTransform transform];
    
    //focus window's view
    [_window.contentView lockFocus];
    //clear window
    NSRect rect = [_window.contentView frame ];
    [[NSColor windowBackgroundColor] set];
    NSRectFill(rect);
    //set winding rule
    
	[thePath1 setWindingRule:NSEvenOddWindingRule];
	
	[thePath1 moveToPoint:NSMakePoint(20,20)];
	
	[thePath1 appendBezierPathWithOvalInRect:NSMakeRect(50,50,100,100)];
	[thePath1 appendBezierPathWithOvalInRect:NSMakeRect(20,20,80,80)];
	
    //1st drawing
	[[NSColor blueColor] set];
	[thePath1 fill];
	
    //already define inline function.
    //#define PI 3.14159265358979323846
    //static inline double radians(double degrees) { return degrees * PI / 180; }
    //add rotate transform
	[affin rotateByRadians:radians(-30.0)];
	
	
	[thePath1 transformUsingAffineTransform: affin];
	
    //2nd drawing
	[[NSColor redColor] set];
	[thePath1 fill];
	
    //unlock focus
    [_window.contentView unlockFocus];
    [_window.contentView displayIfNeeded];
}

drawRect:で使う

#import "MyView.h"

@implementation MyView


-(void)drawRect:(NSRect)rect
{
	
	NSBezierPath *thePath1 = [NSBezierPath bezierPath];
	NSAffineTransform *affin = [NSAffineTransform transform];
	
	[thePath1 setWindingRule:NSEvenOddWindingRule];
	
	[thePath1 moveToPoint:NSMakePoint(20,20)];
	
	[thePath1 appendBezierPathWithOvalInRect:NSMakeRect(50,50,100,100)];
	[thePath1 appendBezierPathWithOvalInRect:NSMakeRect(20,20,80,80)];
	
	[[NSColor blueColor] set];
	[thePath1 fill];
	
	[affin rotateByRadians:0.3];
	
	
	[thePath1 transformUsingAffineTransform: affin];
	
	[[NSColor redColor] set];
	[thePath1 fill];
	
	
	
	
}

@end