Looking forward to reading about your progress on your blog. I hope to see some screenshots when you can.

https://imgur.com/a/TtLvTxX here is my screenshot

Did you manage to get bullets to shoot out from any angle of the plane?

well kind of, I am able to shoot bullets up and down left and right, I am unable to get the bullet to get drawn in front of the plane depending on what way the plane is heading.

1 hour ago, phil67rpg said:

well kind of, I am able to shoot bullets up and down left and right, I am unable to get the bullet to get drawn in front of the plane depending on what way the plane is heading.

Just off-set the position. You can set the draw position when the plane is 90 degree, then when you move the plane, adjust the drawing position for the bullets based on the x and y changes, and when the ship rotates you can rotate the draw position by using the plane's center.

I will work on it. can I post some code?

It's your blog.   

here is the code for drawing my bullets

	glEnable(GL_TEXTURE_2D);

	glBindTexture(GL_TEXTURE_2D, texture[2]);

	glPushMatrix();

	if (angle == (3.0 * PI) / 2.0f)
	{
		space = -1.125f;
	}

	if (angle == PI / 2.0f)
	{
		space = 0.0f;
	}

	if (angle == PI)
	{
		space_two = 0.001f;
	}

	if (angle == 0.0f)
	{
		space_two = 0.0f;
	}

	glBegin(GL_POLYGON);
	glTexCoord3f(0.0f, 0.0f, 0.0f);

	glVertex3f(-5.0625f+cos(angle)*up+horizontal+space_two, 0.625f + sin(angle)*up + vertical + space, 0.0f);
	glTexCoord3f(1.0f, 0.0f, 0.0f);

	glVertex3f(-5.0625f + cos(angle)*up + horizontal + space_two, 0.5f + sin(angle)*up + vertical + space, 0.0f);
	glTexCoord3f(1.0f, 1.0f, 0.0f);

	glVertex3f(-4.9375f + cos(angle)*up + horizontal + space_two, 0.5f + sin(angle)*up + vertical + space, 0.0f);
	glTexCoord3f(0.0f, 1.0f, 0.0f);

	glVertex3f(-4.9375f + cos(angle)*up + horizontal + space_two, 0.625f + sin(angle)*up + vertical + space, 0.0f);
	glEnd();
	
	glPopMatrix();

	glDisable(GL_TEXTURE_2D);

does the 'f' at the end of a number mean 'float'?

1 hour ago, Awoken said:

does the 'f' at the end of a number mean 'float'?

Yup

20 hours ago, phil67rpg said:

(angle == (3.0 * PI) / 2.0f)

if he's using an integer 3.0 and multiplying it by a float does the result equal a float or integer?

4 minutes ago, Awoken said:

if he's using an integer 3.0 and multiplying it by a float does the result equal a float or integer?

3.0 is actually a double-precision floating-point value (or just 'double'), so the result will either be equal to float or double (I'm not sure which one, to be exact), but certainly not an integer.

On ‎9‎/‎28‎/‎2018 at 5:06 PM, Rutin said:

Just off-set the position. You can set the draw position when the plane is 90 degree, then when you move the plane, adjust the drawing position for the bullets based on the x and y changes, and when the ship rotates you can rotate the draw position by using the plane's center.

can I get some input on my code, I have almost solved my problem I am still a little confused on rutins post.

Take this visual example.

The dark blue square is your ship, and the orange rectangle is the spawn point of your bullets.

Now if you  rotate both objects based on their own pivot point being their center, this will happen at 45 degrees:

What you want is to rotate both together to maintain proper position and rotation by changing the center for the orange rectangle. You do this by having the orange rectangle rotate on the center point of the blue square:

I programmed a quick application to demo this.

Below you will see a GIF animation of both objects moving but rotating on their own centers.

Now you'll see them moving but maintaining the position as you would need. I could essentially use the position and angle of the red rectangle transformation to spawn bullets at the correct spot and with the proper angle as needed.

This should be enough to get your started.

37 minutes ago, Rutin said:

Now if you  rotate both objects based on their own pivot point being their center, this will happen at 45 degrees:

thanks for the visual, this is how my sprite is reacting, I

	glVertex3f(-5.0625f+cos(angle)*up+horizontal+space_two, 0.625f + sin(angle)*up + vertical + space, 0.0f);
	glTexCoord3f(1.0f, 0.0f, 0.0f);

	glVertex3f(-5.0625f + cos(angle)*up + horizontal + space_two, 0.5f + sin(angle)*up + vertical + space, 0.0f);
	glTexCoord3f(1.0f, 1.0f, 0.0f);

	glVertex3f(-4.9375f + cos(angle)*up + horizontal + space_two, 0.5f + sin(angle)*up + vertical + space, 0.0f);
	glTexCoord3f(0.0f, 1.0f, 0.0f);

	glVertex3f(-4.9375f + cos(angle)*up + horizontal + space_two, 0.625f + sin(angle)*up + vertical + space, 0.0f);

know what I want it to do which is rotate around the blue square.  in my code is where I am not rotating the sprite around its center, this is where I am having  a problem.

What you want is to rotate both together to maintain proper position and rotation by changing the center for the orange rectangle. You do this by having the orange rectangle rotate on the center point of the blue square:

hmmm... @Rutin, what if @phil67rpg was to ...

Each time the player fires a bullet capture the planes position and normalize it. ( meaning if the x,y and z co-ordinates where all squared, summed and then rooted it'd be equal to 1.  

example, let's say the plane is at position glVertex3f( 5.0f , 0.0f , 0.0f ) the normalized vertex would be glVertex3f( 1.0f , 0.0f , 0.0f ).
Then you'll need to determine the ratio of 1.0f on screen and the width of your plane sprite.  But let's say the plane sprite is 4.0f tip to tip, then you'd want to multiply the normalized vertex by the half the width of the plane.
Add this new vertex, let's call it bullet position, to the position of the plane.

Then for each frame of action you'd just keep adding this same value to it's self over and over again and you should see the bullet fly along an angle.

@Rutin, what are you thinking?

I am taking a class in linear algebra we are working with vectors, the distance formula is what you are talking about, the magnitude of a vector is what you are referring to.

k perfect, I'm leading us astray in my previous post.  

Try the following:

have a normailized vector and call it... I don't know.. bulletRotation.
Each time you rotate the plane rotate the bulletRotation vector by the same amount.
when you fire your bullet use the bulletRotation vector as your reference.
You'll want to add the bulletRotation to the planes position so that it appears the bullet is offset from the plane.
Depending on how fast you want the bullet to travel you'll want to multiply bulletRotation by some amount.

12 minutes ago, Awoken said:

hmmm... @Rutin, what if @phil67rpg was to ...

Each time the player fires a bullet capture the planes position and normalize it. ( meaning if the x,y and z co-ordinates where all squared, summed and then rooted it'd be equal to 1.  

example, let's say the plane is at position glVertex3f( 5.0f , 0.0f , 0.0f ) the normalized vertex would be glVertex3f( 1.0f , 0.0f , 0.0f ).
Then you'll need to determine the ratio of 1.0f on screen and the width of your plane sprite.  But let's say the plane sprite is 4.0f tip to tip, then you'd want to multiply the normalized vertex by the half the width of the plane.
Add this new vertex, let's call it bullet position, to the position of the plane.

Then for each frame of action you'd just keep adding this same value to it's self over and over again and you should see the bullet fly along an angle.

@Rutin, what are you thinking?

@Awoken What I was trying to do was give an example through visual display in my blue square, and the orange rectangle example based on a pivot point. The animation I showed is made with actual game code showing the two in motion. The red rectangle would represent the bullet sprite position and acts as nothing more than a (x, y, and rotation) guide that would update as you moved your plane. I was trying to refrain from posting code in hopes that @phil67rpg could take this concept and code it as I don't feel people learn if they don't understand what is going on and we spoon feed code.

Releasing a shot is extremely simple if you have the guide as I show in my below example:

@Awoken yes, you can normalize.

I don't have much time right now as I'm still at work with tight deadlines to meet.

Maybe this can be of some help @phil67rpg

I didn't check if the content is "good" so keep that in mind.

http://blog.wolfire.com/2009/07/linear-algebra-for-game-developers-part-1/

http://blog.wolfire.com/2009/07/linear-algebra-for-game-developers-part-2/

ops sorry @phil67rpg, no more kinda-sorta-help from me ? 

I have to work on this problem.

17 minutes ago, phil67rpg said:

I have to work on this problem.

Did you have a chance to look at those links I posted?

On 9/28/2018 at 5:12 PM, phil67rpg said:

https://imgur.com/a/TtLvTxX here is my screenshot

That doesnt look too bad. What did you use to develop this and how far along are you? 

17 hours ago, TraderJones said:

That doesnt look too bad. What did you use to develop this and how far along are you? 

I am using opengl c++ and soil, I have drawn two planes and have move around the screen using keys, I also have the first plane to shoot bullets, I am  working on rotating the bullets around my plane sprite so that they shoot from wherever the plane is facing. rutin has been a lot of help.

20 hours ago, Rutin said:

Did you have a chance to look at those links I posted? 

well rutin I am studying the linear algebra links you posted.

I have stubbed out some code to help me understand how to rotate a point.

#include <iostream>
#include <math.h>

using namespace std;

float angle = 0.0f, point_x = 0.0f, rotate_x = 0.0f, point_y = 0.0f, rotate_y = 0.0f;

int main()
{
	cout << "Point X: ";
	cin >> point_x;
	cout << endl;

	cout << "Point Y: ";
	cin >> point_y;
	cout << endl;

	cout << "Angle(radians): ";
	cin >> angle;
	cout << endl;

	rotate_x = point_x*cos(angle) - point_y*sin(angle);
	rotate_y = point_x*sin(angle) + point_y*cos(angle);

	cout << "Rotate X: " << rotate_x << endl;
	cout << "Rotate Y: " << rotate_y << endl;

	system("pause");
	return 0;
}

this is my stubbed out code that draws a circle, I am  doing this in order to understand more about rotations.

#include <iostream>
#include <math.h>
#include <glut.h>

using namespace std;

float angle = 0.0f, point_x = 1.0f, rotate_x = 0.0f, point_y = 0.0f, rotate_y = 0.0f;

float const PI = 3.1415925;

void RenderScene(void)
{
	glClear(GL_COLOR_BUFFER_BIT);
	glColor3f(1.0f, 1.0f, 1.0f);

	glBegin(GL_LINE_STRIP);
	glVertex3f(0.0f, 10.0f, 0.0f);
	glVertex3f(0.0f, -10.0f, 0.0f);
	glEnd();

	glBegin(GL_LINE_STRIP);
	glVertex3f(-10.0f, 0.0f, 0.0f);
	glVertex3f(10.0f, 0.0f, 0.0f);
	glEnd();
	
	glBegin(GL_POINTS);
	for (float angle = 0.0f; angle <= PI*2.0; angle += 0.001)
	{
		rotate_x = point_x*cos(angle) - point_y*sin(angle);
		rotate_y = point_x*sin(angle) + point_y*cos(angle);
		glVertex3f(rotate_x, rotate_y, 0.0f);
	}
	glEnd();
	
	glutSwapBuffers();
}

void SetupRC(void)
{
	glOrtho(-10.0f, 10.0f, -10.0f, 10.0f, 1.0f, -1.0f);
	glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
}

int main(int argc, char* argv[])
{
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA);
	glutInitWindowPosition(500, 300);
	glutInitWindowSize(800, 600);
	glutCreateWindow("Rotate");
	glutDisplayFunc(RenderScene);
	SetupRC();
	glutMainLoop();
	return 0;
}

well I have made some progress on my problem

void drawbullet_one()
{
	glEnable(GL_TEXTURE_2D);

	glBindTexture(GL_TEXTURE_2D, texture[2]);

	glPushMatrix();

	glTranslatef(-5.0f, 0.5f, 0.0f);

	glBegin(GL_POLYGON);
	glTexCoord3f(0.0f, 0.0f, 0.0f);

	glVertex3f(0.0625f*cos(angle) - 0.0625f*sin(angle), 0.0625f*sin(angle) + 0.0625f*cos(angle), 0.0f);
	glTexCoord3f(1.0f, 0.0f, 0.0f);

	glVertex3f(-0.0625f*cos(angle) - 0.0625f*sin(angle), 0.0625f*sin(angle) + 0.0625f*cos(angle), 0.0f);
	glTexCoord3f(1.0f, 1.0f, 0.0f);

	glVertex3f(-0.0625f*cos(angle) - 0.0625f*sin(angle), 0.0625f*sin(angle) + -0.0625f*cos(angle), 0.0f);
	glTexCoord3f(0.0f, 1.0f, 0.0f);

	glVertex3f(0.0625f*cos(angle) - 0.0625f*sin(angle), 0.0625f*sin(angle) + -0.0625f*cos(angle), 0.0f);
	glEnd();

	glTranslatef(5.0f, -0.5f, 0.0f);

	glPopMatrix();

	glDisable(GL_TEXTURE_2D);
}

well rutin I am still stuck on my rotation problem.

2 hours ago, phil67rpg said:

well rutin I am still stuck on my rotation problem.

Can you please list all the materials you're using to learn openGL with? I know you're taking classes at school so there has to be some kind of course material you're using. Book, Teacher's workbooks, ect...

well I have read the opengl superbible 4th ed. I am also working on the opengl programming guide 7th ed.

28 minutes ago, phil67rpg said:

well I have read the opengl superbible 4th ed. I am also working on the opengl programming guide 7th ed.

Are you able to fully teach someone all the concepts you learned within those books without any trouble? Essentially you need to be at the stage where you understand the material enough to actually understand what is working, and why is it working, not that is just "works". Reading through the book from the front to back doesn't mean you understand it.

I'm thinking you're jumping too far ahead and haven't fully understood the rest of the material.

Also... OpenGL SuperBible: Comprehensive Tutorial and Reference (4th Edition) is from 2007.... Why the heck are you learning books that dated in school? OpenGL Superbible: Comprehensive Tutorial and Reference (7th Edition) was released already in 2015. The same with OpenGL Programming Guide: The Official Guide to Learning OpenGL, Versions 3.0 and 3.1 (7th Edition) from 2009... It's not rated a good book in the present...

The first step is getting good materials that are at least up to date. Not all books are created equal as well, there are some that will confuse you more so than help. OpenGL SuperBible should've been enough alone to help you solve your main issues. I would suggest getting an up to date version and going through each part until you truly understand what is going on.