[请教]如何 编写程序在屏幕上画一条正弦曲线？

[CyanLeaf]

如题，编写程序在屏幕上画一条正弦曲线？

还请各位前辈指教~ ：）

（请给出思路和源代码）

[guanqb]

windows程序设计（第5版）

Sample5-2

[BluntBlade]

y=sin(x);

在坐标(x, y）画点。

[laolaoliu2002]

#include "conio.h"
#include "math.h"
#include "graphics.h"

int main()
{
int x=0;
int y=239;
int i,j,h;
float m;
int driver,mode;
driver=VGA;
mode=VGAHI;
initgraph(&driver,&mode,"");
setbkcolor(9);
setcolor(BLUE);
line(317,0,317,479);
line(0,239,639,239);
for(j=0;j<640;j++)
{
m=sin(j/50.5); /**************/
h=y-(int)(m*100);
putpixel(x+j,h,RED);
delay(1000);
}
getch();
closegraph();
return 0;
}

[laolaoliu2002]

#include<stdio.h> 
#include<math.h> 
main(){ 
double y; 
int x,m,i; 
printf("y=sin(x) [0<x<2*pi]\n"); 
for(y=1;y>=-1;y-=0.1){ 
if(y>=0){ 
m=asin(y)*10; 
for(x=1;x<m;x++)printf(" "); 
printf("*",m); 
for(;x<31-m;x++)printf(" "); 
printf("*\n");} 
else{ 
m=-1*asin(y)*10; 
for(i=0;i<32;i++)printf(" "); 
for(x=1;x<m;x++)printf(" "); 
printf("*",m); 
for(;x<31-m;x++)printf(" "); 
printf("*\n",m); 
} 
} 
}

[独孤过儿]

以下代码来源于《Windows程序设计》（第五版）

#include   <windows.h>
#include   <math.h>  

#define   NUM   1000  
#define   TWOPI   6.283185  

TCHAR   szAppName[]   =   TEXT("SineWave");  
HWND   hwnd;    
LRESULT   CALLBACK   WndProc(HWND,   UINT,   WPARAM,   LPARAM);  
BOOL   InitApplication(HINSTANCE);  
void   InitInstance(HINSTANCE,   int);  

int   WINAPI   WinMain(HINSTANCE   hInstance,   HINSTANCE   hPrevInstance,   LPSTR   lpCmdLine,   int   nShowCmd   )  
{  
        MSG   msg;           
        if   (!hPrevInstance)      
                if   (!InitApplication(hInstance))  
                        return   FALSE;            
        InitInstance(hInstance,   nShowCmd);                     
        while   (GetMessage(&msg,   NULL,   0,   0))                   
        {                                                                    
                TranslateMessage(&msg);                                            
                DispatchMessage(&msg);                                                       
        }                                                                                              
        return   msg.wParam;                                                                                 
}                                                                                                                  

BOOL   InitApplication(HINSTANCE   hinstance)                                                                        
{
        WNDCLASS   ws;                                                                                                    
        ws.style   =   CS_VREDRAW   |   CS_HREDRAW;
        ws.lpfnWndProc   =   WndProc;                                                                                       
        ws.cbWndExtra   =   0;                                                                                                    
        ws.cbClsExtra   =   0;
        ws.hInstance   =   hinstance;
        ws.hIcon   =   LoadIcon(NULL,   IDI_APPLICATION);
        ws.hCursor   =   LoadCursor(NULL,   IDC_ARROW);
        ws.hbrBackground   =   (HBRUSH)GetStockObject(WHITE_BRUSH);
        ws.lpszMenuName   =   NULL;
        ws.lpszClassName   =   szAppName;
        return   (RegisterClass(&ws));
}                     

void   InitInstance(HINSTANCE   hinstance,   int   nCmdShow)
{
        hwnd   =   CreateWindow(szAppName,   TEXT("Sine   Wave   Using   Polyline"),   WS_OVERLAPPEDWINDOW,   CW_USEDEFAULT,   CW_US
EDEFAULT,   CW_USEDEFAULT,   CW_USEDEFAULT,   NULL,   NULL,   hinstance,   NULL);
        ShowWindow(hwnd,   nCmdShow);   
        UpdateWindow(hwnd);
}

LRESULT   CALLBACK   WndProc(HWND   hwnd,   UINT   message,   WPARAM   wParam,   LPARAM   lParam)
{
        static   int   cxClient,   cyClient;
        HDC   hdc;
        int   i;
        PAINTSTRUCT   ps;
        POINT   apt[NUM];
        switch   (message)
        {
                case   WM_SIZE:
                        cxClient   =   LOWORD(lParam);
                        cyClient   =   HIWORD(lParam);
                        return   0;
                case   WM_PAINT:
                        hdc   =   BeginPaint(hwnd,   &ps);
                        MoveToEx(hdc,   0,   cyClient   /   2,   NULL);
                        LineTo(hdc,   cxClient,   cyClient   /   2);
                        for   (i   =   0;   i   <   NUM;   ++i)
                        {
                                apt[i].x   =   i   *   cxClient   /   NUM;
                                apt[i].y   =   (int)(cyClient   /   2   *   (1   -   sin(TWOPI   *   i   /   NUM)));
                        }
                        Polyline(hdc,   apt,   NUM);
                        return   0;
                case   WM_DESTROY:
                        PostQuitMessage(0);
                        return   0;
        }
        return   DefWindowProc(hwnd,   message,   wParam,   lParam);
}

[laolaoliu2002]

for(x=0;x<X;x++)
{
setpixel(x,Y0-Y*sin(6.28*x/X0));
}
X= 在屏幕上画多长的曲线
X0= 一个周期画多少个点
Y= 曲线的幅度，y轴高度
Y0= y轴位置

[simo110]

是在Console界面下吗
1，你可以用matlab（如果不考虑语言）
2，另外也可使用MFC中的画图函数
3，可以使用Intel的开源openCV，可以在Console下画出来

要的话可以给你画画

[CyanLeaf]

感谢 3楼 laolaoliu2002 前辈的指点~ ：）

[智者知已应修善业]

尊重网上道德。

[沙漠虫行]

呵呵，都有方法