Print

[Xiphirx]

Xiphirx

Menuing Help

I have an array (dynamically sized) and I want to display the contents as a menu.

Something like:
BEFORE

menuitem1
menuitem2
menuitem3
menuitem4
menuitem5

AFTER PRESSING DOWN

menuitem1
menuitem2
menuitem3
menuitem4
menuitem5

AFTER PRESSING DOWN AGAIN

menuitem1
menuitem2
menuitem3
menuitem4
menuitem5

Hopefully you see how I want it... The current choice is in the center of all the displayed choices... Or like the PSP's Game XMB menu if that helps...

So, I thought about for loops, and I couldn't get a working algorithm out . Another obstacle is that I can only display 6 items at a time.... and  I can't figure out how to limit that.

Help

For The Swarm (StarCraft II Zerg strategy)

I whip my hair back n forth

• 

[Infinitus]

Infinitus

Re: Menuing Help

Code: [Select]

int centerY = 100; // Position of the central menu item on the y-axis.
int x = 0; // Position on the x-axis to draw items.
int selectedIndex = 0; // Index of select menu item.
int menuHeight = 10; // Height of each menu item.

for (int i = 0; i < selectedIndex; i++)
{
int y = (centerY - (((selectedIndex - 1) - i) * menuHeight));
DrawMenuItem(i, x, y);
}

DrawMenuItem(selectedIndex, x, y);

for (int i = selectedIndex + 1; i < menuItemCount; i++)
{
int y = centerY + ((i - selectedIndex) * menuHeight);
DrawMenuItem(i, x, y)
}


Bleh, probably an easier way to do it. But its 3am and I'm to tired D:

This algorithem is also assuming the origin of the menu item being drawn is (0,0).

[Xiphirx]

Xiphirx

Re: Menuing Help

Thank you for that, I have it semi working I can probably finish it off.

For The Swarm (StarCraft II Zerg strategy)

I whip my hair back n forth

• 

[Infinitus]

Infinitus

Re: Menuing Help

Wait, why did I tell you to do it like that. Eh;

Code: [Select]

int centerY = 100; // Position of the central menu item on the y-axis.
int x = 0; // Position on the x-axis to draw items.
int selectedIndex = 0; // Index of select menu item.
int menuHeight = 10; // Height of each menu item.
int menuItemCount = 10; // Number of menu items.

for (int i = 0; i < menuItemCount; i++)
{
int y = centerY - (selectedIndex * MenuHeight);
DrawMenuItem(i, x, y);
}

God dam I'm to tired.

[Xiphirx]

Xiphirx

Re: Menuing Help

Is there a way to have a comparison for loop in lua?

Shouldn't

Code: [Select]

for i=0, i < selection do
-- code
end

work? :S


EDIT: A flaw in your code,

Code: [Select]

int y = centerY - (selectedIndex * MenuHeight);

The y is the same for all items :S

For The Swarm (StarCraft II Zerg strategy)

I whip my hair back n forth

• 

[Zaeranos]

Zaeranos

Re: Menuing Help

Is there a way to have a comparison for loop in lua?

Shouldn't

Code: [Select]

for i=0, i < selection do
-- code
end

work? :S


EDIT: A flaw in your code,

Code: [Select]

int y = centerY - (selectedIndex * MenuHeight);

The y is the same for all items :S

The flawed code probably has to be:

Code: [Select]

int y = centerY - ((selectedIndex - i) * MenuHeight);

the code inside the loop doesn't do anything with the iteration number of the loop.
And if you want a limit on the number of items displayed you probably need the following check:

Code: [Select]

int nrItemsView = 4; //number of items to display
if( abs(i - selectedIndex) <= nrItemsView) { // don't know exactly how to take absolute numbers in C++

or you could do this, because I don't know how to get an absolute number, so the above code probably won't work.

Code: [Select]

int nrItemsView = 4; //number of items to display above the selected item (also for below)
int k = i - selectedIndex <= nrItemsView;
if( k <= nrItemsView  && k >= -nrItemsView) {


[Infinitus]

Infinitus

Re: Menuing Help

Code: [Select]

int y = (centerY - (selectedIndex * MenuHeight)) + (i * MenuHeight);
Bleh. w/e. I told you it was 3-4am . My mind dosen't work at that time .

[Xiphirx]

Xiphirx

Re: Menuing Help

Bleh, I solved it at 3-4am

I can just limit the number of items by showing or not showing items depending on their y values.

FINISHED CODE: (it's in lua)

Code: [Select]

for i = 1, selection - 1 do
zey = spots[3] - ((selection - i) * 18)
screen.print(19, zey, modarray[i], 0.6, gray,1)
end
screen.print(19, spots[3], modarray[selection], 0.6, black,1)
for i = selection + 1, numberofmods do
zey = spots[3] + ((i - selection) * 18)
screen.print(19, zey, modarray[i], 0.6, gray,1)
end

Thanks for all the help guys

For The Swarm (StarCraft II Zerg strategy)

I whip my hair back n forth

•