OpenGL GLFW入門篇 - 畫點集

效果圖

主體代碼

void DrawPoints(void)
{
    int              i;
	GLfloat          x, y;

	glPushMatrix();
	
	//另一個相對的Z平移可以分離對象
    glLoadIdentity();
	glTranslatef(0.0, 0.0, 0.f);

    //設定點大小
    glPointSize(5.0f);
	glBegin(GL_POINTS);

    // 固定點
	glColor3f(0.0f, 0.0f, 1.0f);
	glVertex3f(0.0f, 0.0f, 0.0f);

	glColor3f(0.0f, 1.0f, 0.0f);
	glVertex3f(0.0f, 0.5f, 0.0f);

	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(0.5f, 0.0f, 0.0f);

    // 随機點
    for ( i = 0; i <100 ; i++ )
    {
        // 設定随機數點顔色
		float redValue = (float)(rand() % 255) / 255;
        float greenValue = (float)(rand() % 255) / 255;
        float blueValue = (float)(rand() % 255) / 255;

        glColor3f(redValue, greenValue, blueValue);
        x = (GLfloat)(width / 2 - rand() % width) / width * 2;
        y = (GLfloat)(height / 2 - rand() % height) / height * 2;
        // 設定點坐标
		glVertex3f(x, y, 0.0f);	
    }

    glEnd();
	glPopMatrix();
	return;
}