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#pragma comment(linker, "/SUBSYSTEM:WINDOWS /ENTRY:mainCRTStartup")
#include <GL/freeglut/freeglut.h>
#define WIDTH 320
#define HEIGHT 240
void Square2D(int x1,int y1,int x2, int y2,float size){
glLineWidth(size);
glBegin(GL_LINE_LOOP);
glVertex2i(x1,y1);
glVertex2i(x2,y1);
glVertex2i(x2,y2);
glVertex2i(x1,y2);
glEnd();
}
void Square2D(int x1,int y1,int x2, int y2,int x3,int y3,int x4,int y4,float
size){
glLineWidth(size);
glBegin(GL_LINE_LOOP);
glVertex2i(x1,y1);
glVertex2i(x2,y2);
glVertex2i(x3,y3);
glVertex2i(x4,y4);
glEnd();
}
void SquareFill2D(int x1,int y1,int x2, int y2){
glBegin(GL_QUADS);
glVertex2i(x1,y1);
glVertex2i(x2,y1);
glVertex2i(x2,y2);
glVertex2i(x1,y2);
glEnd();
}
void SquareFill2D(int x1,int y1,int x2, int y2,int x3,int y3,int x4,int
y4){
glBegin(GL_QUADS);
glVertex2i(x1,y1);
glVertex2i(x2,y2);
glVertex2i(x3,y3);
glVertex2i(x4,y4);
glEnd();
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glColor4f(1.0f,0.0f,1.0f,1.0f);
Square2D(30,20,100,60,1.0f);
glColor4f(0.0f,0.0f,1.0f,1.0f);
Square2D(150,20,240,40,280,80,130,100,3.0f);
glColor4f(0.0f,0.5f,0.0f,1.0f);
SquareFill2D(40,150,90,200);
glColor4f(1.0f,0.5f,0.0f,1.0f);
SquareFill2D(150,170,300,150,280,200,170,220);
glFlush();
}
void Init(){
glClearColor(1.0, 1.0, 1.0, 1.0);
glOrtho(0, WIDTH, HEIGHT, 0, -1, 1);
}
int main(int argc, char *argv[])
{
glutInitWindowPosition(100, 100);
glutInitWindowSize(WIDTH, HEIGHT);
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGBA);
glutCreateWindow("四角形を描画");
glutDisplayFunc(display);
Init();
glutMainLoop();
return 0;
}
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