Just My Life & My Work

[OpenGL] 子視窗 (Subwindow)

2011 年 06 月 27 日

之前玩OpenGL只會使用一個視窗，然而有時候想做子母畫面，那要怎麼寫呢？其實十分簡單，一旦把子視窗創造於母視窗之上後，就可以像單一視窗那樣操作！

我在母視窗上建立四個子視窗，母視窗黑、子視窗1紅、子視窗2綠、子視窗3藍、子視窗4橘，並且在母視窗上畫天藍色的Teapot，每個子視窗上畫灰色的Cube。

子視窗可以像單一視窗那樣操作，想要位移、縮放、旋轉都沒問題。應用在遊戲上一定很有趣！

/**
	Theme: Subwindow
	Compiler: Dev C++ 4.9.9.2
	Date: 100/06/27
	Author: ShengWen
	Blog: https://cg2010studio.wordpress.com/
*/
#include <GL/glut.h>
#include <iostream>
using namespace std;
#define GAP 30

int main_w, w1, w2, w3, w4;

void display(void){
	glClear(GL_COLOR_BUFFER_BIT);
	glColor3f(0.5, 0.5, 0.5);
    glutSolidCube(1);
	glutSwapBuffers();
}
void displayx(void){
	glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(0.0, 0.7, 0.7);
    glutSolidTeapot(1);
	glutSwapBuffers();
}
void visibility(int visState){
	cout<<"win: "<<glutGetWindow()<<' '<<"visible: "<<visState<<endl;
}
void reshape(int w, int h){
	int width = 50;
	int height = 50;

	//依目前視窗大小調整子視窗的寬與高
	glViewport(0, 0, w, h);
	if (w > 50) {
		width = (w - 3 * GAP) / 2;
	} else {
		width = 10;
	}
	if (h > 50) {
		height = (h - 3 * GAP) / 2;
	} else {
		height = 10;
	}

	//重繪各子視窗於新的位置
	glutSetWindow(w1);
	glutPositionWindow(GAP, GAP);
	glutReshapeWindow(width, height);

	glutSetWindow(w2);
	glutPositionWindow(GAP + width + GAP, GAP);
	glutReshapeWindow(width, height);

	glutSetWindow(w3);
	glutPositionWindow(GAP, GAP + height + GAP);
	glutReshapeWindow(width, height);

	glutSetWindow(w4);
	glutPositionWindow(GAP + width + GAP, GAP + height + GAP);
	glutReshapeWindow(width, height);
}

int main(int argc, char** argv){
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_RGBA|GLUT_DOUBLE);
	glutInitWindowSize(300, 300);
	glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

	main_w = glutCreateWindow("4 subwindows");		  //主視窗
	glutDisplayFunc(displayx);
	glutVisibilityFunc(visibility);
	glutReshapeFunc(reshape);
	glClearColor(0.0, 0.0, 0.0, 0.0);

	w1 = glutCreateSubWindow(main_w, 10, 10, 110, 110);   //子視窗 1
	glutDisplayFunc(display);
	glutVisibilityFunc(visibility);
	glClearColor(1.0, 0.0, 0.0, 1.0);

	w2 = glutCreateSubWindow(main_w, 110, 10, 110, 110);  //子視窗 2
	glutDisplayFunc(display);
	glutVisibilityFunc(visibility);
	glClearColor(0.0, 1.0, 0.0, 1.0);

	w3 = glutCreateSubWindow(main_w, 10, 110, 110, 110);  //子視窗 3
	glutDisplayFunc(display);
	glutVisibilityFunc(visibility);
	glClearColor(0.0, 0.0, 1.0, 1.0);

	w4 = glutCreateSubWindow(main_w, 110, 110, 110, 110); //子視窗 4
	glutDisplayFunc(display);
	glutVisibilityFunc(visibility);
	glClearColor(1.0, 0.5, 0.0, 1.0);

	cout<<"main_w: "<<main_w<<endl;
	cout<<"w1: "<<w1<<endl;
	cout<<"w2: "<<w2<<endl;
	cout<<"w3: "<<w3<<endl;
	cout<<"w4: "<<w4<<endl;

	glutMainLoop();
	return EXIT_SUCCESS;
}

subwindow參考：使用GLUT callbacks寫互動程式。

分類：

OpenGL, 教學

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