Finding x and y offset of point after rotation
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0
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Hi so I'm stuck with a problem. My old projectile system would only shoot in 4 directions so when finding a new offset it was easy, I just had to inverse certain numbers
case "down":
xOffset = hitbox.xOffset;
yOffset = hitbox.yOffset;
width = hitbox.width;
height = hitbox.height;
break;
case "up":
xOffset = hitbox.xOffset;
yOffset = -hitbox.yOffset - hitbox.height;
width = hitbox.width;
height = hitbox.height;
break;
case "right":
xOffset = hitbox.yOffset;
yOffset = hitbox.xOffset;
width = hitbox.height;
height = hitbox.width;
break;
case "left":
xOffset = -hitbox.yOffset - hitbox.height;
yOffset = hitbox.xOffset;
width = hitbox.height;
height = hitbox.width;
break;
So this worked perfectly, but now the problem is I am no longer using rects for my hitbox and using circles, and i also now implemented 360 shooting.
I have a function that gets the x and y speed based on where I clicked but I do not have the function to get the new hitbox based on it.
newSpeed.x += speed * Math.cos(angle * Math.PI / 180);
newSpeed.y += speed * Math.sin(angle * Math.PI / 180);
How can I do something similar to get the new offset?
math game-physics trigonometry
asked Nov 10 at 20:21
joe
377318
add a comment |
up vote
0
down vote
favorite
Hi so I'm stuck with a problem. My old projectile system would only shoot in 4 directions so when finding a new offset it was easy, I just had to inverse certain numbers
case "down":
xOffset = hitbox.xOffset;
yOffset = hitbox.yOffset;
width = hitbox.width;
height = hitbox.height;
break;
case "up":
xOffset = hitbox.xOffset;
yOffset = -hitbox.yOffset - hitbox.height;
width = hitbox.width;
height = hitbox.height;
break;
case "right":
xOffset = hitbox.yOffset;
yOffset = hitbox.xOffset;
width = hitbox.height;
height = hitbox.width;
break;
case "left":
xOffset = -hitbox.yOffset - hitbox.height;
yOffset = hitbox.xOffset;
width = hitbox.height;
height = hitbox.width;
break;
So this worked perfectly, but now the problem is I am no longer using rects for my hitbox and using circles, and i also now implemented 360 shooting.
I have a function that gets the x and y speed based on where I clicked but I do not have the function to get the new hitbox based on it.
newSpeed.x += speed * Math.cos(angle * Math.PI / 180);
newSpeed.y += speed * Math.sin(angle * Math.PI / 180);
How can I do something similar to get the new offset?
math game-physics trigonometry
asked Nov 10 at 20:21
joe
377318
which language is that?
– phuclv
Nov 11 at 2:44
1
What do you need for the hitbox? You said you are using circles now, so don't you just need a position and a radius? Please explain your system in more detail (possibly with an image) - we can't guess how it looks like.
– Nico Schertler
Nov 11 at 8:20
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
Hi so I'm stuck with a problem. My old projectile system would only shoot in 4 directions so when finding a new offset it was easy, I just had to inverse certain numbers
case "down":
xOffset = hitbox.xOffset;
yOffset = hitbox.yOffset;
width = hitbox.width;
height = hitbox.height;
break;
case "up":
xOffset = hitbox.xOffset;
yOffset = -hitbox.yOffset - hitbox.height;
width = hitbox.width;
height = hitbox.height;
break;
case "right":
xOffset = hitbox.yOffset;
yOffset = hitbox.xOffset;
width = hitbox.height;
height = hitbox.width;
break;
case "left":
xOffset = -hitbox.yOffset - hitbox.height;
yOffset = hitbox.xOffset;
width = hitbox.height;
height = hitbox.width;
break;
So this worked perfectly, but now the problem is I am no longer using rects for my hitbox and using circles, and i also now implemented 360 shooting.
I have a function that gets the x and y speed based on where I clicked but I do not have the function to get the new hitbox based on it.
newSpeed.x += speed * Math.cos(angle * Math.PI / 180);
newSpeed.y += speed * Math.sin(angle * Math.PI / 180);
How can I do something similar to get the new offset?
math game-physics trigonometry
asked Nov 10 at 20:21
joe
377318
Hi so I'm stuck with a problem. My old projectile system would only shoot in 4 directions so when finding a new offset it was easy, I just had to inverse certain numbers
case "down":
xOffset = hitbox.xOffset;
yOffset = hitbox.yOffset;
width = hitbox.width;
height = hitbox.height;
break;
case "up":
xOffset = hitbox.xOffset;
yOffset = -hitbox.yOffset - hitbox.height;
width = hitbox.width;
height = hitbox.height;
break;
case "right":
xOffset = hitbox.yOffset;
yOffset = hitbox.xOffset;
width = hitbox.height;
height = hitbox.width;
break;
case "left":
xOffset = -hitbox.yOffset - hitbox.height;
yOffset = hitbox.xOffset;
width = hitbox.height;
height = hitbox.width;
break;
So this worked perfectly, but now the problem is I am no longer using rects for my hitbox and using circles, and i also now implemented 360 shooting.
I have a function that gets the x and y speed based on where I clicked but I do not have the function to get the new hitbox based on it.
newSpeed.x += speed * Math.cos(angle * Math.PI / 180);
newSpeed.y += speed * Math.sin(angle * Math.PI / 180);
How can I do something similar to get the new offset?
math game-physics trigonometry
math game-physics trigonometry
asked Nov 10 at 20:21
joe
377318
asked Nov 10 at 20:21
joe
377318
asked Nov 10 at 20:21
joe
377318
asked Nov 10 at 20:21
joe
377318
asked Nov 10 at 20:21
joe
377318
377318
which language is that?
– phuclv
Nov 11 at 2:44
1
What do you need for the hitbox? You said you are using circles now, so don't you just need a position and a radius? Please explain your system in more detail (possibly with an image) - we can't guess how it looks like.
– Nico Schertler
Nov 11 at 8:20
add a comment |
which language is that?
– phuclv
Nov 11 at 2:44
1
What do you need for the hitbox? You said you are using circles now, so don't you just need a position and a radius? Please explain your system in more detail (possibly with an image) - we can't guess how it looks like.
– Nico Schertler
Nov 11 at 8:20
which language is that?
– phuclv
Nov 11 at 2:44
which language is that?
– phuclv
Nov 11 at 2:44
1
1
What do you need for the hitbox? You said you are using circles now, so don't you just need a position and a radius? Please explain your system in more detail (possibly with an image) - we can't guess how it looks like.
– Nico Schertler
Nov 11 at 8:20
What do you need for the hitbox? You said you are using circles now, so don't you just need a position and a radius? Please explain your system in more detail (possibly with an image) - we can't guess how it looks like.
– Nico Schertler
Nov 11 at 8:20
add a comment |
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which language is that?
– phuclv
Nov 11 at 2:44
1
What do you need for the hitbox? You said you are using circles now, so don't you just need a position and a radius? Please explain your system in more detail (possibly with an image) - we can't guess how it looks like.
– Nico Schertler
Nov 11 at 8:20