CSE4030 Introduction to Computer Graphics
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1 CSE4030 Introduction to Computer Graphics Dongguk University Jeong-Mo Hong
2 Week 2 The first step on a journey to the virtual world An introduction to computer graphics and interactive techniques How to start graphics programming
3 Teaching Assistants Jeong-Hyun Lee H.P Sun-Tae Kim H.P Dong-Ho Park H.P
4 Location Room No.613 DGU Research Institute for Image & Cultural Content Main Bldg.
5 Lab 2 How to Start Graphics Programming GLUT setup Visual Studio environment setting GLUT API Preparing for a canvas (window) Input devices (keyboard, mouse)
6 OpenGL Open Graphics Library API for 2D and 3D graphics programming Developed by Silicon Graphics OpenGL 3.0 was released on August 11, 2008 Cross-platform (but MS has D3D) GLUT The OpenGL Utility Toolkit
7 OpenGL in Windows opengl32.dll in C:\Windows\System32
8 OpenGL in Windows glu32.dll in C:\Windows\System32
9 GLUT GL Utility API Documents Download GLUT Nate Robin s Homepage Google Nate Robin GLUT for Win32 : glut bin.zip
10 GLUT Setup glut binary release glut.def glut.h glut32.dll glut32.lib
11 GLUT Setup (header) C:\Program Files\Microsoft SDKs\Windows\v6.0A\Include C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Include Default include path of Visual Studio 2005 Copy glut.h file to GL directory
12 GLUT Setup (lib) C:\Program Files\Microsoft SDKs\Windows\v6.0A\Lib C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Lib Default library path of Visual Studio 2005 Copy glut32.lib
13 GLUT Setup (dll) C:\Windows\System32 Default DLL directory of Windows Copy glut32.dll
14 Visual Studio
15 Visual Studio (Project Setting) Create a new project
16 Visual Studio (Project Setting) C++ - Win32 Win32 Console Application
17 Visual Studio (Project Setting) Application setting
18 Visual Studio (Project Setting) Add source code files
19 Visual Studio (Project Setting) C++ - Code C++ File(.cpp)
20 Visual Studio (Project Setting) Change project property
21 Visual Studio (Project Setting) Additional library files for linking Configuration Properties Linker - Input No comma!!! opengl32.lib glu32.lib glut32.lib
22 Visual Studio (Project Setting)
23 Visual Studio (Project Setting) Additional library directories Linker General Additional Library Directories
24 GL Window Creating a window Initialize the background color glclearcolor(glclampf red, Glclmapf green, Glclampf blue, Glclampf alpha) glclearcolor(0, 0, 0, 0) glclearcolor(1, 1, 1, 0)
25 GL Window [1/2] int main(int argc, char **argv) { glutinit(&argc, argv); glutinitdisplaymode(glut_single GLUT_RGB); glutinitwindowsize(500, 500); glutinitwindowposition(100, 100); glutcreatewindow("gl Sample : Hello!"); glclearcolor(0.0, 0.0, 0.0, 0.0); gluortho2d(0, 500, 500, 0); glutdisplayfunc(display); glutmainloop(); } return 0;
26 GL Window [2/2] void display() { glclear(gl_color_buffer_bit); glflush(); }
27 Check List glut.h Is GL\glut.h in one of the include paths? windows.h Required to use GL\GL.h on Windows platform
28 Build Test Build success Build failure Check if the library files(lib) are in correct directories. Is the DLL fine in system32 directory?
29 Keyboard Event Keyboard input handlers int main(int argc, char **argv) { // glutdisplayfunc(display); glutkeyboardfunc(keyboard); glutkeyboardupfunc(keyupfunc); // } return 0;
30 Keyboard Event Test functions for keyboard input void keydownfunc(unsigned char key, int x, int y) { printf( keydown function\n ); } void keyupfunc(unsigned char key, int x, int y) { printf("keyup function ); }
31 Mouse Event Mouse input handlers int main(int argc, char **argv) { // glutdisplayfunc(display); glutmousefunc(mouse); glutmotionfunc(dragging); glutpassivemotionfunc(motion); } // return 0;
32 Mouse Event Test functions for mouse input void mouse(int button, int state, int x, int y) { printf( mouse function\n ); } void motion(int x, int y) { printf("motion function\n ); } void dragging(int x, int y) { printf( dragging function\n ); }
33 Results Expected results
34 Drawing primitives All drawing codes must be implemented in display function Registered using glutdisplayfunc( ) void display() { glbegin( ); // // codes for drawing here // } glend(); glflush(); glutswapbuffers(); glutpostredisplay();
35 Drawing - Points glcolor3f(0.0, 0.0, 0.0); glpointsize(5.0); glbegin(gl_points); glvertex3f(0.1, 0.1, 0.0); glvertex3f(0.9, 0.1, 0.0); glvertex3f(0.1, 0.9, 0.0); glend(); vertex position
36 Drawing - Line GL_LINES GL_LINE_STRIP GL_LINE_LOOP GL_LINES GL_LINE_STRIP glcolor3f(0.0, 0.0, 0.0); glbegin(gl_lines); glvertex3f(0.1, 0.1, 0.0); glvertex3f(0.9, 0.1, 0.0); glvertex3f(0.1, 0.9, 0.0); glend(); GL_LINE_LOOP
37 Assignment Write a visual interactive program Keyboard input (a, s, d, w) Mouse input(move, click)?
38 Appendix - Environment setting Tools Import and Export Settings Environment setting
39 Appendix - Environment setting Reset all settings
40 Appendix - Environment setting Reset settings
41 Appendix - Environment setting Select Visual C++ Development settings
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