[SOLVED] Calculating angle to mouse

[DDDBOMBER]

I need help calculating the angle to the mouse from entities,

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if(orders.get(0) instanceof MoveOrder){               MoveOrder mo = (MoveOrder)orders.get(0);               double xd = mo.x - x;               double yd = mo.y - y;               double rotation = Math.toDegrees(Math.atan2(yd,xd))+270;               rot = rotation;               System.out.println(rot);               orders.remove(0);            }

This is my current code, but it doesn't seem to work, and the movement code is:

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while(rot > 360)rot-= 360;       while(rot < 0)rot+= 360;       double movementAngle = Math.toRadians(rot);         x += Math.sin(movementAngle) * 0.5;         y += Math.cos(movementAngle) * 0.5;

can anyone help?

[deepthought]

everything you have looks correct to me. I assume it's messing up at the stage of getting the angle from the mouse, right? make sure you're getting the right positions in your MoveOrder and entity position.

[h3ckboy]

Can you be more specific in "doesn't work"?

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[kinaite]

this should help:
angle = Math.toDegrees(Math.atan2(MouseY - entity.y, MouseX - entity.x));

[DDDBOMBER]

It seems to go in completely random directions, and doesn't move to the mouse at all...

[kinaite]

to move: (Worked in my game. see Walking sprites in show case)
       x += delta * Math.sin(Math.toRadians(entity.angle));
       y += delta * Math.cos(Math.toRadians(entity.angle));

[deepthought]

you need to find out where you are going wrong. are you getting the correct angle from your first segment?

[DDDBOMBER]

Okay, i've done some testing, and it seems to work fine x Axis, but messes up somewhere on the y Axis, as in, if i tell it to go from (0,0) to (10,0) it works fine, if i want to move just in the x Axis it has to be

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MoveOrder mo = (MoveOrder)orders.get(0);               double xd = mo.x - x;               double yd = mo.y - y;               double rotation = Math.toDegrees(Math.atan2(yd,xd))+90;

However, if i want to move in the y Axis it has to be

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MoveOrder mo = (MoveOrder)orders.get(0);               double xd = mo.x - x;               double yd = mo.y - y;               double rotation = Math.toDegrees(Math.atan2(yd,xd))+270;

Which even further confuses me...

I've got it to move in the right direction by doing it like this

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double movementAngleX = Math.toRadians(rot);       double movementAngleY = Math.toRadians(rot+180);         x += Math.sin(movementAngleX) * 0.5;         y += Math.cos(movementAngleY) * 0.5;         if(orders.size() > 0){            if(orders.get(0) instanceof MoveOrder){               MoveOrder mo = (MoveOrder)orders.get(0);               double xd = mo.x - x;               double yd = mo.y - y;               double rotation = Math.toDegrees(Math.atan2(yd,xd))+90;               rot = rotation;               System.out.println(rot);               orders.remove(0);            }         }

But then the rotation on the image is messed up, the rendering code is (im using LWJGL)

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GL11.glTranslated(x+32, y+32, 0);         GL11.glRotated(rot, 0, 0, -1);         GL11.glBegin(GL11.GL_QUADS);         GL11.glTexCoord2f(0.0f, 0.0f); GL11.glVertex2f(-32, -32);         GL11.glTexCoord2f(1.0f, 0.0f); GL11.glVertex2f(32, -32);         GL11.glTexCoord2f(1.0f, 1.0f); GL11.glVertex2f(32, 32);         GL11.glTexCoord2f(0.0f, 1.0f); GL11.glVertex2f(-32, 32);         GL11.glEnd();

Anyone got any ideas?

[kinaite]

i have made a mistake
this is y coord code:
y -= delta * Math.cos(Math.toRadians(entity.angle));

and try GL11.Rotatef with

angle = angle % 360.0f;
GL11.Rotatef((float)angle...)

[DDDBOMBER]

Thanks! Got it to work,

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double movementAngle = Math.toRadians(rot);         x += Math.sin(movementAngle) * 0.5;         y -= Math.cos(movementAngle) * 0.5;         if(orders.size() > 0){            if(orders.get(0) instanceof MoveOrder){               MoveOrder mo = (MoveOrder)orders.get(0);               double xd = mo.x - x;               double yd = mo.y - y;               double rotation = Math.toDegrees(Math.atan2(yd,xd))+90;               rot = rotation;               orders.remove(0);            }         }

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float angle = (float) (rot % 360.0f);         GL11.glRotated(angle+180.0f, 0, 0, 1);

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[theagentd]

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float angle = (float) (rot % 360.0f);         GL11.glRotated(angle+180.0f, 0, 0, 1);

glRotate() can handle angles outside 360 degrees, but you should keep the actual stored rotation (rot) to 0-360 degrees.