Canvas health bar!

[Game A Gogo]

yay, firts post in advance, well anyway, i need to know how to erase something drawn by a canvas.

in the create event i do this:

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setpen(0, 255, 255, 0, 4);

and in draw actor:

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moveto(0, 0);
lineto(width-1+HP1-28, 0);

what do i do when the HP1 decreases so it lower the bar?(erasing the rest of the bar, and if possible, make it fade out!!)

thx in advence to all!

[DilloDude]

In draw actor, set it check if the health has changed. Create a variable called prevHealth.

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if (HP1 > prevHealth)
{
    moveto(0, 0);
    lineto(width-1+HP1-28, 0);
}
else if (HP1 < prevHealth)
{
    erase(0, 0, 0, 0);
    moveto(0, 0);
    lineto(width-1+HP1-28, 0);
}
prevHealth = HP1

This will only update the health if it has changed, so it will not spend time drawing the same thing over again.

[Game A Gogo]

thx, now i wont have to use activation events!

[Game A Gogo]

oh and there supose to be a ";" at the end

[Game A Gogo]

when i use that, its just put full black.
so i used:

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moveto(HP1/10,0)
lineto(width-1,0);

on when the actor gets hit

[DilloDude]

It should have been

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erase(0, 0, 0, 1);

[Game A Gogo]

It should have been

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erase(0, 0, 0, 1);

oh, yay, no more activation events!