Question and help: Angles, Bitmap and Player Position

[VictorMR]

Well, I'm working with bitmap, but I don't have much idea of how it works exactly.
For example: I'm making a Bullet Bill Launcher that changes angles, depending on the player's position.

Bitmap(1).rotatang is very confusing, (even if its function is already rotating) I don't know how I could use it to change angles depending on the player's location (x, y)...

npc-233.png (690 Bytes) Viewed 4627 times

[HugoMDM]

Rotatang works on radians

Pi = 180 degress
Pi/2 = 90 degress
Pi*2 = 360 degress

[VictorMR]

Spoiler

Well, I'm working with bitmap, but I don't have much idea of how it works exactly.
For example: I'm making a Bullet Bill Launcher that changes angles, depending on the player's position.

Bitmap Help.png

Bitmap(1).rotatang is very confusing, (even if its function is already rotating) I don't know how I could use it to change angles depending on the player's location (x, y)...

npc-233.png

Find a way (Thanks to Monad): and everyone who helped in the post

Code: Select all

bitmap(1).rotatang = angle(.x - char(1).x, char(1).y - .y) + pi/2

IN DEGREES by SetaYoshi

Code: Select all

script angle(width as double, height as double, return double)
 return 2*pi*getangle(param(width), param(height))

[Monad]

Actually the mathematically accurate way to do this is the following:

Code: Select all

do

with bitmap(1)
   .rotatang = atan2(.desty + 0.5 * .scrheight - (char(1).y + 0.5 * char(1).pheight), .destx + 0.5 * .scrwidth - (char(1).x + 0.5 * char(1).pwidth))
end with

call sleep(1)
loop

script atan2(y as double, x as double, return double)
   return 2 * pi * getangle(y, x)
end


Note that in the example I'm using a bitmap, so you if use an NPC instead you will have to do some adaptations, but the logic keeps the same.

[hiyaragi]

Well, I'm working with bitmap, but I don't have much idea of how it works exactly.
For example: I'm making a Bullet Bill Launcher that changes angles, depending on the player's position.

Bitmap Help.png

Bitmap(1).rotatang is very confusing, (even if its function is already rotating) I don't know how I could use it to change angles depending on the player's location (x, y)...

npc-233.png

i searched and found the solution:

Code: Select all

Call BmpCreate(an unique bitmap ID for your bitmap, NPC graphic ID for your bitmap(just uses first frame :( ), 0, 1, 0, 0, your bitmap's width, your bitmap's height, .x, .y, 1, 1, your bitmap's rotation point's x, your bitmap's rotation point's y, 0, -1)
.forecolor = RGBA(255,255,255,0)
bitmap(bitmap ID what you wrote).rotatang = getangle(.y - char(1).y, .x - char(1).x) * (pi * 2)


[HengShao]

Well, I'm working with bitmap, but I don't have much idea of how it works exactly.
For example: I'm making a Bullet Bill Launcher that changes angles, depending on the player's position.

Bitmap Help.png

Bitmap(1).rotatang is very confusing, (even if its function is already rotating) I don't know how I could use it to change angles depending on the player's location (x, y)...

npc-233.png

i searched and found the solution:

Code: Select all

Call BmpCreate(an unique bitmap ID for your bitmap, NPC graphic ID for your bitmap(just uses first frame :( ), 0, 1, 0, 0, your bitmap's width, your bitmap's height, .x, .y, 1, 1, your bitmap's rotation point's x, your bitmap's rotation point's y, 0, -1)
.forecolor = RGBA(255,255,255,0)
bitmap(bitmap ID what you wrote).rotatang = getangle(.y - char(1).y, .x - char(1).x) * (pi * 2)


Please check the date this thread was posted before replying.

[hiyaragi]

Thank all of you for help, thanks to all of you, i made this: https://drive.google.com/file/d/1-pshTeqh0chxq-PMdIlPxjMHerjq23J9/view?usp=sharing. but it can be a little glitchy.

and i musn't forget to say: sprite by master darkar, not me.