用opengl做的折线图和直方图
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#include <GL/glut.h>
//初始化窗口大小
GLsizei winWidth =600,winHeight=600;
GLint xRaster=25,yRaster=150;
GLubyte label[36]={'J','a','n', 'F','e','b', 'M','a','r',
'A','p','r', 'M','a','y', 'J','u','n',
'J','u','l', 'A','u','g', 'S','e','p',
'O','c','t', 'N','o','v', 'D','e','c'};
GLint dataValue[12]={420,342,324,310,262,185,190,196,217,240,312,438};
void init(void)
{
glClearColor(1.0,1.0,1.0,1.0);
glMatrixMode(GL_PROJECTION);
gluOrtho2D(0.0,600.0,0.0,500.0);
}
void lineGraph(void)
{
GLint month,k;
GLint x=30;
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1.0,0.0,0.0);
for (k=0;k<12;k++)
{
glRecti(20+k*50,165,40+k*50,dataValue[k]);
}
glColor3f(0.0,0.0,1.0);
glBegin(GL_LINE_STRIP);
for (k=0;k<12;k++)
{
glVertex2i(x+k*50,dataValue[k]);
}
glEnd();
glColor3f(1.0,0.0,0.0);
for (k=0;k<12;k++)
{
glRasterPos2i(xRaster+k*50,dataValue[k]-4);
glutBitmapCharacter(GLUT_BITMAP_9_BY_15,'*');
}
glColor3f(0.0,0.0,0.0);
xRaster=20;
for (month=0;month<12;month++)
{
glRasterPos2i(xRaster,yRaster);
for (k=3*month;k<3*month+3;k++)
{
glutBitmapCharacter(GLUT_BITMAP_HELVETICA_12,label[k]);
}
xRaster+=50;
}
glFlush();
}
void winReshapeFcn(int newWidth,int newHeight)
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0.0,(GLdouble)newWidth,0.0,(GLdouble)newHeight);
glClear(GL_COLOR_BUFFER_BIT);
}
void main( int argc,char** argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowPosition(100,100);
glutInitWindowSize(winWidth,winHeight);
glutCreateWindow("Line Chart Data Plot");
init();
glutDisplayFunc(lineGraph);
glutReshapeFunc(winReshapeFcn);
glutMainLoop();