NSView和NSBezierPath - Graph不會顯示 - Cocoa/Objective-C

我正在嘗試創建一個應用程序，它將模擬自由落體下的物體的軌跡（更多信息here），並給定速度和角度。 GUI非常簡單：2個數字格式的文本字段（用於速度和角度），1個用於顯示軌跡的按鈕和一個嵌入滾動視圖（類ViewController）的自定義視圖。我的代碼是在這裏：NSView和NSBezierPath - Graph不會顯示 - Cocoa/Objective-C

ViewController.h：

#import <Cocoa/Cocoa.h> 

@interface ViewController : NSView{ 
NSBezierPath *path; 
NSImage *image; 
NSPoint downPoint; 
NSPoint currentPoint; 
float angle; 
float velocity; 
} 

@property (assign) float angle; 
@property (assign) float velocity; 
@property (assign) IBOutlet NSTextField *angleField; 
@property (assign) IBOutlet NSTextField *speedField; 

-(IBAction)fly:(id)sender; 
-(NSRect)currentRect; 
@end

ViewController.m：發生時，我觸發飛行方法是

#import "ViewController.h" 
#import "math.h" 

@implementation ViewController 
@synthesize angle; 
@synthesize velocity; 



- (id)initWithFrame:(NSRect)frame 
{ 
self = [super initWithFrame:frame]; 
if (self) { 
    path = [[NSBezierPath alloc] init]; 
    [path setLineWidth:3.0]; 
} 
return self; 
} 
- (void)drawRect:(NSRect)dirtyRect 
{ 
NSRect bounds = [self bounds]; 
[[NSColor greenColor] set]; 
[NSBezierPath fillRect:bounds]; 
[[NSColor blackColor] set]; 
[[self pathWithVelocity:velocity angle:angle] stroke]; 
} 

-(IBAction)fly:(id)sender 
{ 
angle = [_angleField floatValue]; 
velocity = [_speedField floatValue]; 
NSLog(@"%f - %f",angle,velocity); 
[self drawRect:[self bounds]]; 
} 

-(NSBezierPath *)pathWithVelocity:(float)v angle:(float)a{ 
NSBezierPath* pat = [[NSBezierPath alloc] init]; 
NSPoint p; 
p.x = 0; 
p.y = 0; 
[pat moveToPoint:p]; 
for (float t = 0.5; t < 100; t += 0.5) { 
    p.x = v*cosf(a)*t; 
    p.y = -9.81*t*t/2+v*sinf(a)*t; 
    NSLog(@"(%f;%f)",p.x,p.y); 
    [pat lineToPoint:p]; 
} 
[pat closePath]; 
return pat; 
} 

-(NSRect)currentRect{ 
float minX = MIN(downPoint.x,currentPoint.x); 
float maxX = MAX(downPoint.x,currentPoint.x); 
float minY = MIN(downPoint.y,currentPoint.y); 
float maxY = MAX(downPoint.x,currentPoint.x); 
return NSMakeRect(minX, minY, maxX-minX,maxY-minY); 
} 
@end

的問題：

的視圖正確地綠色但路徑不顯示（即使點座標似乎正確）
當滾動視圖，新點座標顯示的速度和角度都爲零甚至是文本字段的值不會改變

什麼是錯在我的代碼？

編輯：對於角0.7和速度300，我有這樣的輸出：

2013-03-08 07:14:41.892 Flight[10278:303] (114.73;95.41) 
2013-03-08 07:14:41.893 Flight[10278:303] (229.45;188.36) 
2013-03-08 07:14:41.893 Flight[10278:303] (344.18;278.86) 
2013-03-08 07:14:41.894 Flight[10278:303] (458.91;366.91) 
2013-03-08 07:14:41.894 Flight[10278:303] (573.63;452.51) 
2013-03-08 07:14:41.894 Flight[10278:303] (688.36;535.65) 
2013-03-08 07:14:41.895 Flight[10278:303] (803.08;616.34) 
2013-03-08 07:14:41.895 Flight[10278:303] (917.81;694.58) 
2013-03-08 07:14:41.896 Flight[10278:303] (1032.54;770.37) 
2013-03-08 07:14:41.896 Flight[10278:303] (1147.26;843.70) 
2013-03-08 07:14:41.897 Flight[10278:303] (1261.99;914.58) 
2013-03-08 07:14:41.897 Flight[10278:303] (1376.72;983.01) 
2013-03-08 07:14:41.897 Flight[10278:303] (1491.44;1048.99) 
2013-03-08 07:14:41.898 Flight[10278:303] (1606.17;1112.51) 
2013-03-08 07:14:41.898 Flight[10278:303] (1720.90;1173.58) 
2013-03-08 07:14:41.898 Flight[10278:303] (1835.62;1232.20) 
2013-03-08 07:14:41.899 Flight[10278:303] (1950.35;1288.37) 
2013-03-08 07:14:41.899 Flight[10278:303] (2065.07;1342.08) 
2013-03-08 07:14:41.899 Flight[10278:303] (2179.80;1393.34) 
2013-03-08 07:14:41.900 Flight[10278:303] (2294.53;1442.15) 
2013-03-08 07:14:41.900 Flight[10278:303] (2409.25;1488.51) 
2013-03-08 07:14:41.900 Flight[10278:303] (2523.98;1532.41) 
2013-03-08 07:14:41.901 Flight[10278:303] (2638.71;1573.86) 
2013-03-08 07:14:41.901 Flight[10278:303] (2753.43;1612.86) 
2013-03-08 07:14:41.901 Flight[10278:303] (2868.16;1649.41) 
2013-03-08 07:14:41.901 Flight[10278:303] (2982.88;1683.50) 
2013-03-08 07:14:41.902 Flight[10278:303] (3097.61;1715.15) 
2013-03-08 07:14:41.902 Flight[10278:303] (3212.34;1744.33) 
2013-03-08 07:14:41.902 Flight[10278:303] (3327.06;1771.07) 
2013-03-08 07:14:41.903 Flight[10278:303] (3441.79;1795.35) 
2013-03-08 07:14:41.903 Flight[10278:303] (3556.52;1817.19) 
2013-03-08 07:14:41.903 Flight[10278:303] (3671.24;1836.56) 
2013-03-08 07:14:41.904 Flight[10278:303] (3785.97;1853.49) 
2013-03-08 07:14:41.904 Flight[10278:303] (3900.70;1867.97) 
2013-03-08 07:14:41.905 Flight[10278:303] (4015.42;1879.99) 
2013-03-08 07:14:41.905 Flight[10278:303] (4130.15;1889.56) 
2013-03-08 07:14:41.906 Flight[10278:303] (4244.87;1896.67) 
2013-03-08 07:14:41.906 Flight[10278:303] (4359.60;1901.34) 
2013-03-08 07:14:41.906 Flight[10278:303] (4474.33;1903.55) 
2013-03-08 07:14:41.907 Flight[10278:303] (4589.05;1903.31) 
2013-03-08 07:14:41.907 Flight[10278:303] (4703.78;1900.61) 
2013-03-08 07:14:41.907 Flight[10278:303] (4818.51;1895.47) 
2013-03-08 07:14:41.908 Flight[10278:303] (4933.23;1887.87) 
2013-03-08 07:14:41.908 Flight[10278:303] (5047.96;1877.82) 
2013-03-08 07:14:41.908 Flight[10278:303] (5162.69;1865.31) 
2013-03-08 07:14:41.909 Flight[10278:303] (5277.41;1850.36) 
2013-03-08 07:14:41.909 Flight[10278:303] (5392.14;1832.95) 
2013-03-08 07:14:41.909 Flight[10278:303] (5506.86;1813.09) 
2013-03-08 07:14:41.910 Flight[10278:303] (5621.59;1790.77) 
2013-03-08 07:14:41.910 Flight[10278:303] (5736.32;1766.01) 
2013-03-08 07:14:41.910 Flight[10278:303] (5851.04;1738.79) 
2013-03-08 07:14:41.911 Flight[10278:303] (5965.77;1709.12) 
2013-03-08 07:14:41.911 Flight[10278:303] (6080.50;1676.99) 
2013-03-08 07:14:41.911 Flight[10278:303] (6195.22;1642.42) 
2013-03-08 07:14:41.912 Flight[10278:303] (6309.95;1605.39) 
2013-03-08 07:14:41.912 Flight[10278:303] (6424.67;1565.91) 
2013-03-08 07:14:41.912 Flight[10278:303] (6539.40;1523.97) 
2013-03-08 07:14:41.913 Flight[10278:303] (6654.13;1479.59) 
2013-03-08 07:14:41.913 Flight[10278:303] (6768.85;1432.75) 
2013-03-08 07:14:41.913 Flight[10278:303] (6883.58;1383.46) 
2013-03-08 07:14:41.914 Flight[10278:303] (6998.31;1331.72) 
2013-03-08 07:14:41.915 Flight[10278:303] (7113.03;1277.52) 
2013-03-08 07:14:41.915 Flight[10278:303] (7227.76;1220.87) 
2013-03-08 07:14:41.915 Flight[10278:303] (7342.49;1161.77) 
2013-03-08 07:14:41.916 Flight[10278:303] (7457.21;1100.22) 
2013-03-08 07:14:41.916 Flight[10278:303] (7571.94;1036.21) 
2013-03-08 07:14:41.917 Flight[10278:303] (7686.66;969.75) 
2013-03-08 07:14:41.917 Flight[10278:303] (7801.39;900.84) 
2013-03-08 07:14:41.918 Flight[10278:303] (7916.12;829.48) 
2013-03-08 07:14:41.918 Flight[10278:303] (8030.84;755.66) 
2013-03-08 07:14:41.919 Flight[10278:303] (8145.57;679.39) 
2013-03-08 07:14:41.919 Flight[10278:303] (8260.30;600.67) 
2013-03-08 07:14:41.919 Flight[10278:303] (8375.02;519.50) 
2013-03-08 07:14:41.920 Flight[10278:303] (8489.75;435.87) 
2013-03-08 07:14:41.920 Flight[10278:303] (8604.47;349.79) 
2013-03-08 07:14:41.921 Flight[10278:303] (8719.20;261.26) 
2013-03-08 07:14:41.921 Flight[10278:303] (8833.93;170.28) 
2013-03-08 07:14:41.921 Flight[10278:303] (8948.65;76.84) 
2013-03-08 07:14:41.922 Flight[10278:303] (9063.38;-19.05) 
2013-03-08 07:14:41.922 Flight[10278:303] (9178.11;-117.39) 
2013-03-08 07:14:41.922 Flight[10278:303] (9292.83;-218.18) 
2013-03-08 07:14:41.923 Flight[10278:303] (9407.56;-321.43) 
2013-03-08 07:14:41.923 Flight[10278:303] (9522.29;-427.13) 
2013-03-08 07:14:41.924 Flight[10278:303] (9637.01;-535.28) 
2013-03-08 07:14:41.924 Flight[10278:303] (9751.74;-645.88) 
2013-03-08 07:14:41.924 Flight[10278:303] (9866.46;-758.94) 
2013-03-08 07:14:41.925 Flight[10278:303] (9981.19;-874.45) 
2013-03-08 07:14:41.925 Flight[10278:303] (10095.92;-992.41) 
2013-03-08 07:14:41.925 Flight[10278:303] (10210.64;-1112.82) 
2013-03-08 07:14:41.926 Flight[10278:303] (10325.37;-1235.69) 
2013-03-08 07:14:41.926 Flight[10278:303] (10440.10;-1361.00) 
2013-03-08 07:14:41.927 Flight[10278:303] (10554.82;-1488.78) 
2013-03-08 07:14:41.927 Flight[10278:303] (10669.55;-1619.00) 
2013-03-08 07:14:41.927 Flight[10278:303] (10784.28;-1751.68) 
2013-03-08 07:14:41.928 Flight[10278:303] (10899.00;-1886.80) 
2013-03-08 07:14:41.928 Flight[10278:303] (11013.73;-2024.39) 
2013-03-08 07:14:41.929 Flight[10278:303] (11128.45;-2164.42) 
2013-03-08 07:14:41.929 Flight[10278:303] (11243.18;-2306.91) 
2013-03-08 07:14:41.929 Flight[10278:303] (11357.91;-2451.84) 
2013-03-08 07:14:41.930 Flight[10278:303] (11472.63;-2599.23) 
2013-03-08 07:14:41.930 Flight[10278:303] (11587.36;-2749.08) 
2013-03-08 07:14:41.930 Flight[10278:303] (11702.09;-2901.37) 
2013-03-08 07:14:41.931 Flight[10278:303] (11816.81;-3056.12) 
2013-03-08 07:14:41.931 Flight[10278:303] (11931.54;-3213.32) 
2013-03-08 07:14:41.932 Flight[10278:303] (12046.26;-3372.98) 
2013-03-08 07:14:41.932 Flight[10278:303] (12160.99;-3535.08) 
2013-03-08 07:14:41.933 Flight[10278:303] (12275.72;-3699.64) 
2013-03-08 07:14:41.933 Flight[10278:303] (12390.44;-3866.65) 
2013-03-08 07:14:41.934 Flight[10278:303] (12505.17;-4036.12) 
2013-03-08 07:14:41.934 Flight[10278:303] (12619.90;-4208.03) 
2013-03-08 07:14:41.935 Flight[10278:303] (12734.62;-4382.40) 
2013-03-08 07:14:41.935 Flight[10278:303] (12849.35;-4559.22) 
2013-03-08 07:14:41.935 Flight[10278:303] (12964.08;-4738.50) 
2013-03-08 07:14:41.936 Flight[10278:303] (13078.80;-4920.22) 
2013-03-08 07:14:41.936 Flight[10278:303] (13193.53;-5104.40) 
2013-03-08 07:14:41.936 Flight[10278:303] (13308.25;-5291.03) 
2013-03-08 07:14:41.937 Flight[10278:303] (13422.98;-5480.12) 
2013-03-08 07:14:41.937 Flight[10278:303] (13537.71;-5671.65) 
2013-03-08 07:14:41.937 Flight[10278:303] (13652.43;-5865.64) 
2013-03-08 07:14:41.937 Flight[10278:303] (13767.16;-6062.08) 
2013-03-08 07:14:41.938 Flight[10278:303] (13881.89;-6260.98) 
2013-03-08 07:14:41.938 Flight[10278:303] (13996.61;-6462.32) 
2013-03-08 07:14:41.939 Flight[10278:303] (14111.34;-6666.12) 
2013-03-08 07:14:41.939 Flight[10278:303] (14226.07;-6872.37)  
2013-03-08 07:14:41.940 Flight[10278:303] (14340.79;-7081.08) 
2013-03-08 07:14:41.940 Flight[10278:303] (14455.52;-7292.23) 
2013-03-08 07:14:41.940 Flight[10278:303] (14570.24;-7505.84) 
2013-03-08 07:14:41.941 Flight[10278:303] (14684.97;-7721.90) 
2013-03-08 07:14:41.941 Flight[10278:303] (14799.70;-7940.41)

來源

2013-03-07 Moray

Y軸爲你所得到的座標似乎是-ve。嘗試打印協調並查看您的繪圖是否開始。它可能正在從你的視野範圍中劃出。

來源

2013-03-07 21:02:54 nkongara

-ve是什麼意思？一些座標是負值，但大多數都是正值。我將以點座標爲例更新我的文章。 – Moray 2013-03-08 05:12:33

-ve表示負數，+ ve表示正數:) – dreamlax 2013-03-08 05:22:47

正如我所說的，大部分值都是正數，看看更新後的問題。 – Moray 2013-03-09 14:41:04

NSView和NSBezierPath - Graph不會顯示 - Cocoa/Objective-C

回答

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