#include <GL/glut.h>#pragma comment(linker,"/subsystem:\"windows\" /entry:\"mainCRTStartup\"") /* 三角形 GL_TRIANGLES(三個點成一個三角形) GL_TRIANGLE_STRIP(相鄰三點成一個三角形) GL_TRIANGLE_FAN(同第二個，后2個和第一個成三角形)四邊形 GL_QUADS(四點一個) GL_QUAD_STRIP(相鄰四點一個)多邊形 GL_POLYGONglPolygonMode(GL_FRONT_AND_BACK,GL_LINE); */ void drawPoint(void) {int i;glColor3f (0.0, 0.0, 1.0);glPointSize(5);glBegin(GL_POINTS);for (i = 0; i < 7; i++)glVertex2f (0.2 + ((GLfloat) i * 0.1), 0.6);glEnd (); }void drawLines(void) {glColor3f(0.0,0.0,1.0);glLineWidth(5);glBegin(GL_LINES);glVertex2f(0.0, 0.0);glVertex2f(0.25,0.25);glVertex2f(0.75,0.25);glVertex2f(0.0,0.0);glEnd(); }void drawOneLine(GLfloat a,GLfloat b,GLfloat c,GLfloat d) {glBegin(GL_LINES);glVertex2f(a,b);glVertex2f(c,d);glEnd(); }void drawLineStripple(void) {glEnable (GL_LINE_STIPPLE);glColor3f (0.0, 0.0, 1.0);glLineStipple (1, 0x0101); /* dotted */drawOneLine (-0.25, 0.8, -0.75, 0.8);glLineStipple (1, 0x00FF); /* dashed */drawOneLine (-0.25, 0.6, -0.75, 0.6);glLineStipple (1, 0x1C47); /* dash/dot/dash */drawOneLine (-0.25, 0.4, -0.75, 0.4);///* in 2nd row, 3 wide lines, each with different stipple */glLineWidth (5.0);glLineStipple (1, 0x0101); /* dotted */drawOneLine (-0.25, 0.2, -0.75, 0.2);glLineStipple (1, 0x00FF); /* dashed */drawOneLine (-0.25, 0.0, -0.75, 0.0);glLineStipple (1, 0x1C47); /* dash/dot/dash */drawOneLine (-0.25, -0.2, -0.75, -0.2);glLineWidth (1.0);///* in 4th row, 6 independent lines with same stipple */int i;for (i = 0; i < 6; i++) {drawOneLine (0.05 + ((GLfloat) i * 0.01), 0.5,0.05 + ((GLfloat)(i+1) * 0.01), 0.5);}/////* in 5th row, 1 line, with dash/dot/dash stipple *////* and a stipple repeat factor of 5 */glLineStipple (5, 0x1C47); /* dash/dot/dash */drawOneLine (50.0, 25.0, 350.0, 25.0);glDisable (GL_LINE_STIPPLE);}void drawLineStrip() {glColor3f (0.0, 0.0, 1.0);glPointSize(5);// glBegin(GL_LINE_STRIP);glBegin(GL_LINE_LOOP);glVertex2f(0.0,0.0);glVertex2f(-0.3,-0.5);glVertex2f(0.3,-0.5);glEnd (); }void myDisplay(void) {glClear(GL_COLOR_BUFFER_BIT);// glRectf(-0.5f, -0.5f, 0.5f, 0.5f);//設置顏色glColor3f(1.0,1.0,0.0);//畫出矩形glBegin(GL_POLYGON);glVertex3f(0.25,0.25,0.25);glVertex3f(0.75,0.25,0.0);glVertex3f(0.75,0.75,0.0);glVertex3f(0.25,0.75,0.0);//glVertex3f(0.0,0.5,0.0);glEnd();drawPoint();drawLines();drawLineStripple();drawLineStrip();glFlush(); }void reshape (int w, int h) {// glViewport (0, 0, (GLsizei) w, (GLsizei) h);glMatrixMode (GL_PROJECTION);glLoadIdentity ();//gluOrtho2D (0.0, (GLdouble) w, 0.0, (GLdouble) h);// glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);//glOrtho(left, right, bottom, top, near, far) }int main(int argc, char *argv[]) {glutInit(&argc, argv);glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);glutInitWindowPosition(100, 100);glutInitWindowSize(400, 400);glutCreateWindow("第一個OpenGL程序");//glClearColor (0.0, 1.0, 1.0, 0.0);glutDisplayFunc(myDisplay);glutReshapeFunc(reshape);glutMainLoop();return 0; }
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