// release the dc ReleaseDC(hwnd,hdc); return(0); break; case WM_DESTROY: { // kill the application, this sends a WM_QUIT message PostQuitMessage(0); // return success return(0); } break; default:break; } // end switch
// process any messages that we didn't take care of
return (DefWindowProc(hwnd, message, wParam, lParam)); } // end WinProc
// WINMAIN //////////////////////////////////////////////// int WINAPI WinMain( HINSTANCE hinstance, HINSTANCE hprevinstance, LPSTR lpcmdline, int ncmdshow) {
WNDCLASSEX winclass; // this will hold the class we create HWND hwnd; // generic window handle MSG message; // generic message
// first fill in the window class stucture
winclass.cbSize = sizeof(WNDCLASSEX); winclass.style = CS_DBLCLKS | CS_OWNDC |
CS_HREDRAW | CS_VREDRAW; winclass.lpfnWndProc = WindowProc; winclass.cbClsExtra = 0; winclass.cbWndExtra = 0; winclass.hInstance = hinstance; winclass.hIcon = LoadIcon(NULL, IDI_APPLICATION); winclass.hCursor = LoadCursor(NULL, IDC_ARROW);
winclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); winclass.lpszMenuName = NULL;
winclass.lpszClassName = WINDOW_CLASS_NAME;
winclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
// save hinstance in global
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hinstance_app = hinstance;
// register the window class
if (!RegisterClassEx(&winclass)) return(0);
// create the window
if (!(hwnd = CreateWindowEx(NULL, // extended style WINDOW_CLASS_NAME, // class \ WS_OVERLAPPEDWINDOW | WS_VISIBLE, 0,0, // initial x,y WINDOW_WIDTH, // initial width WINDOW_HEIGHT,// initial height NULL, // handle to parent NULL, // handle to menu hinstance,// instance of this application NULL))) // extra creation parms return(0);
// save main window handle main_window_handle = hwnd;
while(GetMessage(&message,NULL,0,0)) { // translate any accelerator keys TranslateMessage(&message); // send the message to the window proc DispatchMessage(&message); } // end while
// return to Windows like this return(message.wParam); } // end WinMain
///////////////////////////////////////////////////////////
void BoundaryFill4(HDC hdc,int x,int y,COLORREF boundarycolor,COLORREF newcolor) { COLORREF color; color=GetPixel(hdc,x,y); if((color != boundarycolor) && (color !=newcolor)) { SetPixel(hdc,x,y,newcolor); BoundaryFill4(hdc,x,y+1,boundarycolor,newcolor); BoundaryFill4(hdc,x,y-1,boundarycolor,newcolor);
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BoundaryFill4(hdc,x-1,y,boundarycolor,newcolor); BoundaryFill4(hdc,x+1,y,boundarycolor,newcolor); } }
2、vc.net中建立Win32工程
更改项目中recursion.cpp文件代码： 1）声明函数
void BoundaryFill4(HDC,int,int,COLORREF,COLORREF);
2）修改LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)函数中代码，把visualc++6.0介绍的recursion.cpp中的WndProc函数体复制即可。 3）在recursion.cpp文件末尾添加BoundaryFill4函数。
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实验四 二维图形的几何变换
一、实验学时 2学时 二、实验类型 设计型实验 三、实验目的和要求
1、掌握二维图形的基本几何变换，如平移、旋转、缩放、对称、错切变换； 2、掌握OpenGL中模型变换函数，实现简单的动画技术。 四、实验内容 1、下面的代码采用GLUT库，实现了一个矩形在窗口中匀速转动（单击鼠标右键停止转动），请修改代码，实现矩形在窗口内沿着水平线匀速移动。
/*
* double.c
* This is a simple double buffered program.
* Pressing the left mouse button rotates the rectangle. * Pressing the right mouse button stops the rotation. */
#include
static GLfloat spin = 0.0;
void display(void) {
glClear(GL_COLOR_BUFFER_BIT); glPushMatrix();
glRotatef(spin, 0.0, 0.0, 1.0); glColor3f(1.0, 1.0, 1.0);
glRectf(-10.0, -10.0, 10.0, 10.0); glPopMatrix();
glutSwapBuffers(); }
void spinDisplay(void) {
spin = spin + 2.0; if (spin > 360.0) spin = spin - 360.0; glutPostRedisplay(); }
void init(void) {
glClearColor (0.0, 0.0, 0.0, 0.0);
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glShadeModel (GL_FLAT); }
void reshape(int w, int h) {
glViewport (0, 0, (GLsizei) w, (GLsizei) h); glMatrixMode(GL_PROJECTION); glLoadIdentity();
glOrtho(-50.0, 50.0, -50.0, 50.0, -1.0, 1.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); }
void mouse(int button, int state, int x, int y) {
switch (button) {
case GLUT_LEFT_BUTTON: if (state == GLUT_DOWN) glutIdleFunc(spinDisplay); break;
case GLUT_MIDDLE_BUTTON: case GLUT_RIGHT_BUTTON: if (state == GLUT_DOWN) glutIdleFunc(NULL); break; default: break; } } /*
* Request double buffer display mode. * Register mouse input callback functions */
int main(int argc, char** argv) {
glutInit(&argc, argv);
glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB); glutInitWindowSize (500, 500); glutInitWindowPosition (100, 100); glutCreateWindow (argv[0]); init ();
glutDisplayFunc(display); glutReshapeFunc(reshape);
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