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#pragma comment(linker, "/SUBSYSTEM:WINDOWS /ENTRY:mainCRTStartup")
#include <GL/freeglut/freeglut.h>
#define WIDTH 320
#define HEIGHT 240
//回転用
float anglex = 0.0f;
//オレンジ
GLfloat orange[] = { 1.0f, 0.6f, 0.0f, 1.0f };
//赤
GLfloat red[] = { 1.0, 0.0, 0.0, 1.0 };
//ライトの位置
GLfloat lightpos[] = { -50.0, 100.0, -50.0, 1.0 };
float zoom = 50.0f;
bool flag = false;
void SquareFill(int x1,int y1,int x2, int y2){
glBegin(GL_QUADS);
glVertex3i(x1,-30,y1);
glVertex3i(x2,-30,y1);
glVertex3i(x2,-30,y2);
glVertex3i(x1,-30,y2);
glEnd();
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glViewport(0, 0, WIDTH, HEIGHT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
//視野角,アスペクト比(ウィンドウの幅/高さ),描画する範囲(最も近い距離,最も遠い距離)
gluPerspective(zoom, (double)WIDTH / (double)HEIGHT, 1.0, 1000.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
//視点の設定
gluLookAt(150.0,100.0,-200.0, //カメラの座標
0.0,0.0,0.0, // 注視点の座標
0.0,1.0,0.0); // 画面の上方向を指すベクトル
//ライトの設定
glLightfv(GL_LIGHT0, GL_POSITION, lightpos);
//マテリアルの設定
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, orange);
SquareFill(100,100,-100,-100);
//回転
glRotatef(anglex,1.0f,0.0f,0.0f);//X軸を回転
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
glutSolidCube(40.0);
glutSwapBuffers();
}
void idle(void)
{
anglex+=0.5f;
if(flag){
zoom+=0.2f;
}else{
zoom-=0.2f;
}
if(zoom<15.0f)flag=true;
if(zoom>50.0f)flag=false;
Sleep(1);
glutPostRedisplay();
}
void Init(){
glClearColor(0.3f, 0.3f, 0.3f, 1.0f);
glEnable(GL_DEPTH_TEST);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
}
int main(int argc, char *argv[])
{
glutInitWindowPosition(100, 100);
glutInitWindowSize(WIDTH, HEIGHT);
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE);
glutCreateWindow("ズームイン・アウト");
glutDisplayFunc(display);
glutIdleFunc(idle);
Init();
glutMainLoop();
return 0;
}
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