I know this is more of a general programming question, but my Android
friends here have always been helpful. I am trying to make an image
move from one part of the screen to a position the user touches, as a
constant speed. I don't know the best way to go about doing this and
the way I have been trying to get to work is taxing my brain too much.
I have been using geometry to calculate slope, then using Sin *
movement speed to calculate the difference in X,Y coordinates.
This is the code I'm looking at:
TouchX = V.TX; (This is the touch event coordinates
TouchY =
V.TY; )
Slope = (TouchY - V.CurY) / (TouchX - V.CurX); (this
figures out
the slope of the line to the touch point)
DegreeSlopeY = Math.atan(Slope);
DegreeSlopeY = Math.abs(DegreeSlopeY);
(this is so
that I can calculate the direction the image should travel along the
slope)
DegreeSlopeX = (90.0000000000000 - DegreeSlopeY);
NewY = (mMoveSpeed * Math.sin(DegreeSlopeY)); (This
calculates the
shift in Y axis for the image)
NewX = (mMoveSpeed * Math.sin(DegreeSlopeX)); (This
calculates the
shift in X axis for the image)
if(TouchX < V.CenterX) NewX = -NewX; (This is to
finish
calculating the correct X axis direction to travel)
if(TouchY < V.CenterY) NewY = -NewY; (This is to
finish
calculating the correct X axis direction to travel)
The problem that I'm having is the image is veering way of course when
traveling in Y heavy paths. When traveling horizontally it works
almost perfect.
I know there is probably an easier way though I don't know how to use
a lot of things (like OpenGLES) so if your advice is to use a
different method please link a tutorial for that method if you know of
one.
Thanks in advance.
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