Getting A Classic Zelda View

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Getting A Classic Zelda View

Nick

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Joined: 2004.07

Post: #31

Aug 23, 2004 — 01:45 PM

alright thanks.

Nick

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Posts: 1,066
Joined: 2004.07

Post: #32

Aug 23, 2004 — 02:00 PM

Ok. I'm having some more trouble. I have set up the projection as such:

Code:

glMatrixMode(GL_PROJECTION); // Select The Projection Matrix

    glLoadIdentity(); // Reset The Projection Matrix

    gluOrtho2D(0,width,height,0);

Yet when I start a quad at (0,0) it places it in the middle of the screen instead of the top left corner. Is there something I'm missing?

arekkusu

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Posts: 1,231
Joined: 2002.10

Post: #33

Aug 23, 2004 — 02:07 PM

Well, what are your modelview matrix and viewport?

Nick

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Posts: 1,066
Joined: 2004.07

Post: #34

Aug 23, 2004 — 02:20 PM

Code:

glMatrixMode(GL_PROJECTION); // Select The Projection Matrix

    glLoadIdentity(); // Reset The Projection Matrix

    gluOrtho2D(0,width,height,0);

    glViewport(0,0,width,height); // Make our viewport the whole window

                                  // We could make the view smaller inside

                                  // Our window if we wanted too.

                                  // The glViewport takes (x, y, width, height)

                                  // This basically means, what our our drawing boundries

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

I think I did the modelview wrong.

Here's what I'm trying to draw.

Code:

glBegin(GL_QUADS);

    glColor3ub(255,0,0);

    glVertex2f(0,0);

    glVertex2f(10,0);

    glVertex2f(10,10);

    glVertex2f(0,10);

    glEnd();

    glBegin(GL_TRIANGLES);

    glColor4ub(0,0,255,200);

    glVertex2f(2,2);

    glVertex2f(4,4);

    glVertex2f(0,4);

    glEnd();

Nick

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Posts: 1,066
Joined: 2004.07

Post: #35

Aug 23, 2004 — 02:38 PM

I'm not sure how I did it, but it's working fine now. Thanks for all the help I've gotten up to now. I'll post again if I need more advice. I think my problem was defining the viewport AFTER the projection matrix because that's all I did (move it above the projection and modelview matrices).

Nick

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Posts: 1,066
Joined: 2004.07

Post: #36

Aug 23, 2004 — 02:45 PM

I'm trying to play with the alpha channel right now and running into trouble. I'm trying to draw a red rectangle with a blue semi-transparent triangle over half of it. Here's my code:

Code:

glBegin(GL_QUADS);

    glColor3ub(255,0,0);

    glVertex2f(0,0);

    glVertex2f(20,0);

    glVertex2f(20,50);

    glVertex2f(0,50);

    glEnd();

    glBegin(GL_TRIANGLES);

    glColor4ub(0,0,255,100);

    glVertex2f(0,0);

    glVertex2f(20,50);

    glVertex2f(0,50);

    glEnd();

When I run it, I only see the red rectangle. Why is my triangle not there?

Nick

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Posts: 1,066
Joined: 2004.07

Post: #37

Aug 23, 2004 — 03:02 PM

Ah yes, forgot the disabling of the depth sorting.

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