using C++ , OpenGL , and Visual Studio 2013 IDE
void drawSquare(){
glBegin(GL_QUADS); //Primitive
glVertex2i(200, 100);//vertices for points(coordinates)
glVertex2i(250, 100);
glVertex2i(250, 150);
glVertex2i(200, 150);
glEnd();
}
void myDisplay(void)
{
glClear(GL_COLOR_BUFFER_BIT);
drawSquare();
glTranslatef(1.5, 1.5, 0);
drawSquare();
glScalef(0.3, 0.3, 0);
drawSquare();
glRotatef(45, 0, 0, 1);
drawSquare();
glFlush(); //Set all output to display
}
does this code perform composite concatenation ?
Question
Build a transformation that
a) Rotate through 45 deg [M1]
b) Scale in X By 1.5 and in Y By -2 [M2]
c) Translate Through (3,5) [M3]
Find the image under this transofrmation of the point (1,2)
so we will work backwards and first apply part c then part b then part a
i.e M3 * M2 * M1
Step-1
[ATTACH=CONFIG]1608[/ATTACH]
Step-2
[ATTACH=CONFIG]1609[/ATTACH]
i understood the process of Composite Concatenation
what i dont understand is how to perform a composite concatenation through program code ?
consider the code i posted at the very beginning
it calls
drawSquare
glRotate
drawSquare
glTranslate
drawSquare
is this composite concatenation ?
how do i use the final generated Matrix (Qx,Qy,1) and use it to perform composite concatenation