Sounds interesting about your implementation. How many lines of code do you wrote for the C# lightning? How about it compared to the bitmap version?
Thanks, On Fri, Feb 4, 2011 at 11:41 PM, niko20 <nikolatesl...@yahoo.com> wrote: > Peter's idea sounds like a good one to start with to try and see if > you like it. > > For the best realism though I think a bitmap would be the solution. > You don't have to rotate the bitmap - just make a bitmap that is known > as a "billboard" (google billboarding graphics), with some alpha in > it. (Although maybe the alpha will slow render time way down, don't > know). Then you just do a quick loop from point A to point B, > calculate the positions yourself (use slope of the line equations) and > blit the bitmap over and over. You can also have two bitmaps, one > pulsed and the other not, and then just cycle between them at a > determined rate. The blitted bitmaps will overlap each other and form > a type of particle beam effect. > > Although for a laser maybe Peter's solution is best, my bitmap idea > would be more like a particle beam type thing. > > I've used this technique to create lightning for a game I wrote a long > time ago in C#, worked really well. (To create lighting I randomized > some of the points between A and B to move around) > > > -niko > > On Feb 3, 8:05 pm, Peter Webb <r.peter.w...@gmail.com> wrote: > > I bet you can make a pretty funky laser beam using the draw lines or > > fill polygon commands in the Canvas/Paint library. > > > > To draw basic unpulsed laser beam draw a transparent line of width 6 > > between a and b. Then draw on top an opaque line of width 2 between a > > and b. You will get an effect where the laser beam falls off in > > brighness from the centre to the edges. > > > > To pulse it, draw a short line segment of width (say) 8 on top of the > > unpulsed laser beam, and move its position between a and b every > > screen refresh so the pulse moves along the line. > > > > If you want your laser beam to be some shape other than a long thin > > rectangle, you can do the same thing with a polygon fill command and > > you can have the laser beam whatever shape and size you want. > > > > On Feb 3, 7:38 pm, Mando <mando.aka.ch...@gmail.com> wrote: > > > > > > > > > > > > > > > > > Hi, hope this is the right location to post this. > > > > > I am working on a 2d android game with a light space shooter theme. I > > > wanted my ship to have a turret the that tracks targets, rotates and > > > fires a laser beam that is animated (maybe pulsing or with non uniform > > > bulges issuing out of the turret and moving down towards the target). > > > > > Key parts of the problem. laser starts at 1 coordinate and terminates > > > at another in 2d space and could be of arbitrary length (might be > > > scaled if I decide to add zooming). > > > > > Possible brute force solutions: > > > 1) using rotation/transformation to manually draw a bitmap > > > representing a segment of laser all along the required distance. > > > (cycling the bitmap as required for animation) > > > 2) Create a very large laser beam image (longer than I would need eg: > > > 10px by 500px) and draw it at correct transformation. > > > > > Looking at the BitmapShader and reading some of the SDK info about > > > Paths, Paints etc it feels like there should be a better way to do > > > this, but no examples I've found covers it. > > > > > Any idea if there is a way to use a BitmapShader to paint using a > > > canvas.drawLine or canvas.drawPath call to create this effect? > > > > > Thanks in advance > > > > > Mando > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to android-developers@googlegroups.com > To unsubscribe from this group, send email to > android-developers+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
