Locate the center of an explosion
8 replies
1 
14.10.19 09:12:32 am
Hi there!
I want to know if it is possible to locate the center of every kind of explosion in this game.
I'm experimenting on knockback function and I'm thinking of making explosion with knockback.
If I use a parse command to create an explosion, that will be easy. But what about grenade and mine?
How to know when and where a grenade or a mine explode?
I want to know if it is possible to locate the center of every kind of explosion in this game.
I'm experimenting on knockback function and I'm thinking of making explosion with knockback.
If I use a parse command to create an explosion, that will be easy. But what about grenade and mine?
How to know when and where a grenade or a mine explode?
Fishy's Zombie Mod v0.2.0 Beta (Nov 27th 2019) (4) Join my server at "142.11.240.170". I hope you will have a good time. Please give some feedback. 
14.10.19 09:25:24 am
Well if you spawn grenades with trigger_if then in the command that you write stands the distance (in pixels) that projectile will travel before explosion/impact.
Hope thats helpfull enough.
Hope thats helpfull enough.
you nubs still visit usgn site in 2022?
14.10.19 07:02:35 pm
Thanks!
I used the hook you said and find out where grenade impact. But it will only work for projectile, not something on the ground like mine and laser mine.
Now one more thing left is to locate the explosion from mine and laser mine.
I used the hook you said and find out where grenade impact. But it will only work for projectile, not something on the ground like mine and laser mine.
Now one more thing left is to locate the explosion from mine and laser mine.
Fishy's Zombie Mod v0.2.0 Beta (Nov 27th 2019) (4) Join my server at "142.11.240.170". I hope you will have a good time. Please give some feedback. 15.10.19 04:13:52 am
Make use of 
objectkill to get object ID and object to get their location, also my advice is don't use player parameter from objectkill hook.
objectkill to get object ID and object to get their location, also my advice is don't use player parameter from objectkill hook. 15.10.19 10:08:06 pm
Thank @
Baloon: for the tip. Now I can also locate the mine.
However, I can't get the accurate angle to get the victim knockbacked toward the right direction.
All I know is that I need distance between the center of explosion and victim. Which mean:
distance_x = victim_x - object_x
distance_y = victim_y - object_y
I think that arctan of distance_x/distance_y is the angle.
But when the code run, it kind of mess up.
The knockback direction should be directly further away from the explosion. However, in some quadrant the direction isn't going as intended.
Perhaps, it's because of the inconsistency about x,y and direction
Here's the code that I use for testing.
It will spawn a mine at tile (4|4) or at x=128 y=128 in term of pixel and tell the player what the angle x,y,distance,direction are.
Baloon: for the tip. Now I can also locate the mine.However, I can't get the accurate angle to get the victim knockbacked toward the right direction.
All I know is that I need distance between the center of explosion and victim. Which mean:
distance_x = victim_x - object_x
distance_y = victim_y - object_y
I think that arctan of distance_x/distance_y is the angle.
But when the code run, it kind of mess up.
The knockback direction should be directly further away from the explosion. However, in some quadrant the direction isn't going as intended.
Perhaps, it's because of the inconsistency about x,y and direction
Here's the code that I use for testing.
It will spawn a mine at tile (4|4) or at x=128 y=128 in term of pixel and tell the player what the angle x,y,distance,direction are.
Code:
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color = {'©255200000','©000255000','©160160255','©255000000','©240000240','©255128064','©255255255','©155255000','©100100255'}
--ARRAY GENERATOR
function initArray(size, iValue)
local array = {}
for i = 1, size do
array[i]=iValue
end
return array
end
function cw_hud2(id,txtID,c,txt,x,y,a,v,s)
local screen_h = player(id,"screenh")
local screen_w = player(id,"screenw")
local posX = 0
local posY = 0
local align = 0
local valign = 0
local size = 13
local text = ""
if (screen_h and screen_w) then
posX = screen_h / 480 * x
posY = screen_w / 850 * y
end
if (a) then
align = a
end
if (v) then
valign = v
end
if (s) then
size = s
end
if(player(id,"exists") and player(id,"bot") ~= true) then
text = color[c] .. txt
parse("hudtxt2 " ..id.. " " ..txtID.. ' "' ..color[c]..txt.. '" ' ..posX.. " " ..posY.. " " ..align.. " " ..valign.. " " ..size)
end
end
addhook("ms100","hud_angle")
function hud_angle()
parse("spawnobject 20 4 4 0 0 0")
local cx = 128
local cy = 128
local px = 0
local py = 0
local disX = 0
local disY = 0
local angle = 0
if(player(1,"exists")) then
px = player(1,"x")
py = player(1,"y")
disX = px - cx
disY = -(py - cy)
angle = math.deg(math.atan(disX/disY))
end
cw_hud2(1,20,2,"Angle "..angle,200,200,0,0,13)
cw_hud2(1,21,3,"px "..px,200,210,0,0,13)
cw_hud2(1,22,4,"py "..py,200,220,0,0,13)
cw_hud2(1,23,3,"cx "..cx,200,240,0,0,13)
cw_hud2(1,24,4,"cx "..cy,200,250,0,0,13)
cw_hud2(1,25,3,"disx "..disX,200,270,0,0,13)
cw_hud2(1,26,4,"disy "..disY,200,280,0,0,13)
end
addhook("objectkill","cw_knockback_mine")
function cw_knockback_mine(obj)
parse("spawnobject 20 4 4 0 0 0")
local x = object(obj,"x")
local y = object(obj,"y")
local hitX
local hitY
local disX
local disY
local angle
local toX = 0
local toY = 0
local knockback_distance = 48
local hit_List = closeplayers(x,y,96)
if(table.getn(hit_List) > 0) then
for id = 1, table.getn(hit_List) do
hitX = player(hit_List[id],"x")
hitY = player(hit_List[id],"y")
disX = hitX - x
disY = -(hitY - y)
angle = math.deg(math.atan(disX/disY))
--adjusting angle to start at 3 o'clock counter clockwise
--angle = 90 - angle
--if (angle < 0) then angle = 360 + angle end
if(player(id,"exists")) then
toX = toX + knockback_distance * math.cos(angle)
toY = toY + knockback_distance * math.sin(angle)
end
msg("target "..hit_List[id])
msg("at x"..hitX.." y"..hitX)
msg("angle "..angle)
msg("impact center x"..x.." y"..y)
msg("toX "..toX)
msg("toY "..toY)
end
end
end
--ARRAY GENERATOR
function initArray(size, iValue)
local array = {}
for i = 1, size do
array[i]=iValue
end
return array
end
function cw_hud2(id,txtID,c,txt,x,y,a,v,s)
local screen_h = player(id,"screenh")
local screen_w = player(id,"screenw")
local posX = 0
local posY = 0
local align = 0
local valign = 0
local size = 13
local text = ""
if (screen_h and screen_w) then
posX = screen_h / 480 * x
posY = screen_w / 850 * y
end
if (a) then
align = a
end
if (v) then
valign = v
end
if (s) then
size = s
end
if(player(id,"exists") and player(id,"bot") ~= true) then
text = color[c] .. txt
parse("hudtxt2 " ..id.. " " ..txtID.. ' "' ..color[c]..txt.. '" ' ..posX.. " " ..posY.. " " ..align.. " " ..valign.. " " ..size)
end
end
addhook("ms100","hud_angle")
function hud_angle()
parse("spawnobject 20 4 4 0 0 0")
local cx = 128
local cy = 128
local px = 0
local py = 0
local disX = 0
local disY = 0
local angle = 0
if(player(1,"exists")) then
px = player(1,"x")
py = player(1,"y")
disX = px - cx
disY = -(py - cy)
angle = math.deg(math.atan(disX/disY))
end
cw_hud2(1,20,2,"Angle "..angle,200,200,0,0,13)
cw_hud2(1,21,3,"px "..px,200,210,0,0,13)
cw_hud2(1,22,4,"py "..py,200,220,0,0,13)
cw_hud2(1,23,3,"cx "..cx,200,240,0,0,13)
cw_hud2(1,24,4,"cx "..cy,200,250,0,0,13)
cw_hud2(1,25,3,"disx "..disX,200,270,0,0,13)
cw_hud2(1,26,4,"disy "..disY,200,280,0,0,13)
end
addhook("objectkill","cw_knockback_mine")
function cw_knockback_mine(obj)
parse("spawnobject 20 4 4 0 0 0")
local x = object(obj,"x")
local y = object(obj,"y")
local hitX
local hitY
local disX
local disY
local angle
local toX = 0
local toY = 0
local knockback_distance = 48
local hit_List = closeplayers(x,y,96)
if(table.getn(hit_List) > 0) then
for id = 1, table.getn(hit_List) do
hitX = player(hit_List[id],"x")
hitY = player(hit_List[id],"y")
disX = hitX - x
disY = -(hitY - y)
angle = math.deg(math.atan(disX/disY))
--adjusting angle to start at 3 o'clock counter clockwise
--angle = 90 - angle
--if (angle < 0) then angle = 360 + angle end
if(player(id,"exists")) then
toX = toX + knockback_distance * math.cos(angle)
toY = toY + knockback_distance * math.sin(angle)
end
msg("target "..hit_List[id])
msg("at x"..hitX.." y"..hitX)
msg("angle "..angle)
msg("impact center x"..x.." y"..y)
msg("toX "..toX)
msg("toY "..toY)
end
end
end
Fishy's Zombie Mod v0.2.0 Beta (Nov 27th 2019) (4) Join my server at "142.11.240.170". I hope you will have a good time. Please give some feedback. 15.10.19 11:52:09 pm
Try this, it's untested but it should get the job done for mines. I don't really know how effective it will be against laser mines because the "explosion center" (x, y in the code) is where the object is placed.
Code:
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local knockback_distance = 48
addhook("objectkill","cw_knockback_mine")
function cw_knockback_mine(obj)
local x, y = object(obj,"x") + 16, object(obj,"y") + 16 -- add 16 to get the center of the tile
local hit_List = closeplayers(x, y, 96)
if(#hit_List > 0) then
for id = 1, #hit_List do
local target = hit_List[id]
if(player(target,"exists")) then
local targetX = player(target, "x")
local targetY = player(target, "y")
local angle = math.atan2(targetY - y, targetX - x)
toX = targetX + knockback_distance * math.cos(angle)
toY = targetY + knockback_distance * math.sin(angle)
parse("setpos "..target.." "..toX.." "..toY)
end
end
end
end
addhook("objectkill","cw_knockback_mine")
function cw_knockback_mine(obj)
local x, y = object(obj,"x") + 16, object(obj,"y") + 16 -- add 16 to get the center of the tile
local hit_List = closeplayers(x, y, 96)
if(#hit_List > 0) then
for id = 1, #hit_List do
local target = hit_List[id]
if(player(target,"exists")) then
local targetX = player(target, "x")
local targetY = player(target, "y")
local angle = math.atan2(targetY - y, targetX - x)
toX = targetX + knockback_distance * math.cos(angle)
toY = targetY + knockback_distance * math.sin(angle)
parse("setpos "..target.." "..toX.." "..toY)
end
end
end
end
16.10.19 03:24:45 am
And that's is all I need to know for the knockback mechanism.
Thanks everyone!
Now I can enjoy doing rocket jump with my grenade launcher.
Thanks everyone!
Now I can enjoy doing rocket jump with my grenade launcher.
Fishy's Zombie Mod v0.2.0 Beta (Nov 27th 2019) (4) Join my server at "142.11.240.170". I hope you will have a good time. Please give some feedback. 1