[原创]随机画Bezier曲线的程序

主题：[原创]随机画Bezier曲线的程序

caoxin [专家分：1540] 发布于 2005-05-17 23:50:00

工程目录是:Win32App
vc6.0

#include<windows.h>
#include<stdlib.h>
#include<time.h>
#define NUM 10

LRESULT CALLBACK Winproc(HWND,UINT,WPARAM,LPARAM);

int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstanc,LPSTR lpCmdLine,int nShowCmd)
{
    MSG msg;
    static TCHAR szClassName[] = TEXT("::Bezier样条计算公式由法国雷诺汽车公司的工程师Pierm Bezier于六十年代提出");
    HWND hwnd;
    WNDCLASS wc;
    wc.cbClsExtra =0;
    wc.cbWndExtra =0;
    wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    wc.hCursor = LoadCursor(NULL,IDC_ARROW);
    wc.hIcon = LoadIcon(NULL,IDI_APPLICATION);
    wc.hInstance = hInstance;
    wc.lpfnWndProc = Winproc;
    wc.lpszClassName = szClassName;
    wc.lpszMenuName = NULL;
    wc.style = CS_HREDRAW|CS_VREDRAW;

    if(!RegisterClass(&wc))
    {
        MessageBox(NULL,TEXT("注册失败"),TEXT("警告框"),MB_ICONERROR);
        return 0;
    }

    hwnd = CreateWindow(szClassName,szClassName,
                        WS_OVERLAPPEDWINDOW,
                        CW_USEDEFAULT,CW_USEDEFAULT,
                        CW_USEDEFAULT,CW_USEDEFAULT,
                        NULL,NULL,hInstance,NULL);

    ShowWindow(hwnd,SW_SHOWMAXIMIZED);
    UpdateWindow(hwnd);

    while(GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return msg.wParam;
}

LRESULT CALLBACK Winproc(HWND hwnd,UINT message, WPARAM wparam,LPARAM lparam)
{
  PAINTSTRUCT ps;
  HDC hdc;
  static POINT pt[NUM];
  TEXTMETRIC tm;
  static int cxClient,cyClient;
  HPEN hpen;
  int i,j,k,n,t;

  switch(message)
  {
  case WM_CREATE:
      static int cxchar;
      hdc = GetDC(hwnd);
      GetTextMetrics(hdc,&tm);
      cxchar = tm.tmAveCharWidth;
      ReleaseDC(hwnd,hdc);

  case WM_SIZE:

      cxClient = LOWORD(lparam);
      cyClient = HIWORD(lparam);

      return 0;

  case WM_PAINT:
       hdc = GetDC(hwnd);
       srand(time(0));

       Rectangle(hdc,0,0,cxClient,cyClient);
      for(i=0; i<500; i++)
          {
            SelectObject(hdc,GetStockObject(WHITE_PEN));

            PolyBezier(hdc,pt,NUM);

            for(j=0; j<NUM; j++)
            {
                pt[j].x = rand()%cxClient;
                pt[j].y = rand()%cyClient;
            }
            hpen = CreatePen(PS_INSIDEFRAME,3,RGB(rand()%256,rand()%256,rand()%256));

            DeleteObject(SelectObject(hdc,hpen));

            PolyBezier(hdc,pt,NUM);

            for(k=0; k<50000000;k++);

          }
      for(i=0; i<100;i++)
      {
        Ellipse(hdc,rand()%cxClient,rand()%cyClient,rand()%cxClient,rand()%cyClient);

        Pie(hdc,j=rand()%cxClient,k=rand()%cyClient,n=rand()%cxClient,t=rand()%cyClient,rand()%cxClient,rand()%cyClient,rand()%cxClient,rand()%cyClient) ;

      }
       if((n=(n+j)/2)>cxchar*20) n=cxchar*20;
        SetTextColor(hdc,RGB(rand()%256,rand()%256,rand()%256));
        TextOut(hdc,n/2,(t+k)/2,TEXT("瑾以此向Pierm Bezier致敬!"),lstrlen(TEXT("瑾以此向Pierm Bezier致敬!")));
        ReleaseDC(hwnd,hdc);
          DeleteObject(hpen);
          ValidateRect(hwnd,NULL);

      return 0;

  case WM_DESTROY:
      PostQuitMessage(0);
      return 0;
  }
  return DefWindowProc(hwnd,message,wparam,lparam);
}

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回复列表（共9个回复）

沙发

bruceteen [专家分：42660] 发布于 2005-05-18 10:22:00

：）整个代码其实有用的就是一句 PolyBezier(hdc,pt,NUM) ，而且PolyBezier还是windows的一个API。

板凳

caoxin [专家分：1540] 发布于 2005-05-19 21:28:00

嘿嘿.知道怎么用就不错了

另外:
     SelectObject(hdc,GetStockObject(WHITE_PEN));
     CreatePen(PS_INSIDEFRAME,3,RGB(rand()%256,rand()%256,rand()%256));

     DeleteObject(SelectObject(hdc,hpen));

也是有用的.

3 楼

sunson468 [专家分：510] 发布于 2005-05-19 21:44:00

怎么看起来都象封装的原程序，就加了一点东西！

4 楼

caoxin [专家分：1540] 发布于 2005-05-19 21:48:00

Windows程序都是这样的.

5 楼

caoxin [专家分：1540] 发布于 2005-05-28 00:36:00

顶！

6 楼

jackin0627 [专家分：1270] 发布于 2005-09-29 11:03:00

用的都是人家的技术，
要是自个编一个画Bezier曲线的函数才好

7 楼

探路者二号 [专家分：1170] 发布于 2005-09-29 12:29:00

--------------------Configuration: BezierCurves. - Win32 Debug--------------------
Compiling...
BezierCurves..c
E:\MSVCDev\BezierCurves..c(65) : error C2143: syntax error : missing ';' before 'type'
E:\MSVCDev\BezierCurves..c(68) : error C2065: 'cxchar' : undeclared identifier
Error executing cl.exe.

BezierCurves..exe - 2 error(s), 0 warning(s)

8 楼

iAkiak [专家分：8460] 发布于 2005-09-29 21:00:00

ogl2dlib里的b样条生成代码：乱是比较乱...不过还凑合能用

#pragma warning(disable : 4786)
#include <windows.h>
#include <gl/gl.h>
#include <assert.h>
#include "bspline.h"

/// b-spline
/*
                {  -d^3 + 3d^2 - 3d + 1  }
{x1,x2,x3,x4} . {  3d^3 - 6d^2 + 0d + 4  }
{y1,y2,y3,y4}   { -3d^3 + 3d^2 + 3d + 1  }
                {   d^3 + 0d^2 + 0d + 0  }

  x = {x1(-d^3+3d^2-3d+1)+x2(d^3-6d^2+4)+x3(-d^3+3d^2+3d+1)+x4(d^3) } / 6
  y = {y1(-d^3+3d^2-3d+1)+y2(d^3-6d^2+4)+y3(-d^3+3d^2+3d+1)+y4(d^3) } / 6
*/
sbspline sBspLine;
float g_dd[4];
#define SP_COUNT 1023

float s_dd[SP_COUNT + 1][4];
const float one_sixth = 1.0f/6.0f;

void initbspline()
{
    float d,d2,d3,t1,t2,t3;
    int i = 0;
    for (d=0.0f; i<=SP_COUNT; d+=1.0f / SP_COUNT)
    {
        d2 = d * d;
        d3 = d2 * d;
        t1 = -d3 + 3*d2 - 3*d + 1.0f;
        t2 = 3*d3 - 6*d2 + 4.0f;
        t3 = -3*d3 +3*d2 + 3*d +1.0f;
        s_dd[i][0] = t1 * one_sixth;
        s_dd[i][1] = t2 * one_sixth;
        s_dd[i][2] = t3 * one_sixth;
        s_dd[i][3] = d3 * one_sixth;
        ++i;
    }
}

struct splineInitializer
{
    splineInitializer()
    {
        initbspline();
    }
};
static splineInitializer spl;

void bspline(float d)
{
    /*
    float d2 = d * d;
    float d3 = d2 * d;
    d *= 3.0f;
    d2 *= 3.0f;
    float t1 = d2 - d + 1.0f - d3;
    float t3 = 3.0f * d3 - d2;
    float t2 = t3 - d2 + 4.0f;
    t3 = d + 1.0f - t3;
    sBspLine.x = (sBspLine.x1*t1 + sBspLine.x2*t2 + sBspLine.x3*t3 + sBspLine.x4*d3)*one_sixth;
    sBspLine.y = (sBspLine.y1*t1 + sBspLine.y2*t2 + sBspLine.y3*t3 + sBspLine.y4*d3)*one_sixth;
    /*/
    int i = (int)(d * SP_COUNT);
    if (i > SP_COUNT) i = SP_COUNT;
    if (i < 0) i = 0;
    float t1 = s_dd[i][0];
    float t2 = s_dd[i][1];
    float t3 = s_dd[i][2];
    float d3 = s_dd[i][3];
    sBspLine.x = sBspLine.x1*t1 + sBspLine.x2*t2 + sBspLine.x3*t3 + sBspLine.x4*d3;
    sBspLine.y = sBspLine.y1*t1 + sBspLine.y2*t2 + sBspLine.y3*t3 + sBspLine.y4*d3;
    //*/
}

void bspline_d(float d)
{
    /*
    float d2 = d * d;
    float d3 = d2 * d;
    d *= 3.0f;
    d2 *= 3.0f;
    float t1 = d2 - d + 1.0f - d3;
    float t3 = 3.0f * d3 - d2;
    float t2 = t3 - d2 + 4.0f;
    t3 = d + 1.0f - t3;
    g_dd[0] = t1*one_sixth;
    g_dd[1] = t2*one_sixth;
    g_dd[2] = t3*one_sixth;
    g_dd[3] = d3*one_sixth;
    /*/
    int i = (int)(d * SP_COUNT);
    if (i > SP_COUNT) i = SP_COUNT;
    if (i < 0) i = 0;
    g_dd[0] = s_dd[i][0];
    g_dd[1] = s_dd[i][1];
    g_dd[2] = s_dd[i][2];
    g_dd[3] = s_dd[i][3];
    //*/

}

void makeBS(int sn, float xs[], float ys[], float ts[], int t, float &ox, float &oy)
{
    float dd;
    int j;

    // j = (t/200) % (sn - 4 + 1);
    while (1)
    {
        for (j=0;j<sn-4+1;j++)
        {
            if (t<ts[j])
                break;
        }
        if (j < sn-4+1)
            break;
        t -= (int)ts[sn-1];
    }
    dd = (t-ts[j-1]) / (ts[j] - ts[j-1]);

    sBspLine.x1 = xs[j];
    sBspLine.y1 = ys[j];
    sBspLine.x2 = xs[j+1];
    sBspLine.y2 = ys[j+1];
    sBspLine.x3 = xs[j+2];
    sBspLine.y3 = ys[j+2];
    sBspLine.x4 = xs[j+3];
    sBspLine.y4 = ys[j+3];
    bspline(dd);
    ox = sBspLine.x;
    oy = sBspLine.y;
}

void DrawBS(int sn, float xs[], float ys[])
{
    float n,x,y,dd;
    int j,i;

    glDisable(GL_TEXTURE_2D);
    glColor3f(0,1,0);
    glBegin(GL_LINE_STRIP);
    for (j=0;j<sn;j++)
        glVertex2f(xs[j],ys[j]);
    glEnd();

    glColor3f(1,1,1);

    glBegin(GL_LINE_STRIP);
    n=8;
    for (j=0;j < sn - 4 + 1;j++)
    {
        dd=0.f;
        for (i=0;i<n;i++)
        {
            sBspLine.x1 = xs[j];
            sBspLine.y1 = ys[j];
            sBspLine.x2 = xs[j+1];
            sBspLine.y2 = ys[j+1];
            sBspLine.x3 = xs[j+2];
            sBspLine.y3 = ys[j+2];
            sBspLine.x4 = xs[j+3];
            sBspLine.y4 = ys[j+3];
            bspline(dd);
            x = sBspLine.x;
            y = sBspLine.y;

            //glColor3f((j*n+i)/(5*n),(j*n+i)/(5*n),(j*n+i)/(5*n));
            glVertex2f(x, y);
            dd += 1.0f/n;
        }
    }
    bspline(dd);
    x = sBspLine.x;
    y = sBspLine.y;

    //glColor3f((j*n+i)/(5*n),(j*n+i)/(5*n),(j*n+i)/(5*n));
    glVertex2f(x, y);

    glEnd();
    glEnable(GL_TEXTURE_2D);
}

9 楼

caoxin [专家分：1540] 发布于 2005-09-30 16:27:00

隔了数月看自己写的东西,发现该用PeekMessage()的

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