Colour Flash

Is there any way that I can flash (or colour cycle) a particular colour. Lets say, for instance, that I have a grid of lines, and I plot this to a buffer that is then copied to the backbuffer on every frame.

The grid is not re-drawn on every frame, but I would like to cycle the colours in the line that make up the grid. I know that I could do it by re-plotting in adifferent colour, but I don't want to do that.

Thanks,

Zoot

it's not possible to cycle colors in blitz,so you have to redraw the grid each frames if you wan't to change the color.

sorry but the only way i know to do such a thing is the folowing example

make an image[buffer1] the size of the grid draw the grid in blue on a black background setmask the image to blue

make a second picture[buffer2] the same size and set themask to black

then do this each frame

setbuffer imagebuffer(buffer2)
clscolor r,g,b ;your color cycling colors
cls
drawimage buffer1,0,0;this draw the grid with the grid as transparent color so that leave a black screen with only the grid in the color used by clscolor (your cycling color)
setbuffer frontbuffer()
drawimage buffer2,0,0;this draw the grid with the black as transparent color on top of your gfx so you'll have your grid in the color you wan't 
flip

i don't know if it's what you wanted :)

here's the complete example code

Graphics 800,600,32,3
;create the buffers
buffer1=CreateImage(800,600):MaskImage buffer1,0,0,255
buffer2=CreateImage(800,600):MaskImage buffer2,0,0,0
;create the grid
	SetBuffer(ImageBuffer(buffer1))
	Color 0,0,255
	For x=0 To 800 Step 16
		Line x,0,x,600
		Line 0,x,800,x
	Next
Repeat
    Text Rand(800),Rand(600),"just a test"
	SetBuffer ImageBuffer(buffer2)
	ClsColor Rand(255),Rand(255),Rand(255)
	Cls
	DrawImage buffer1,0,0
	SetBuffer FrontBuffer()
	DrawImage buffer2,0,0
	Flip
Until KeyDown(1)

hope you like :)

Thanks - very nice. It will do just what I wanted. Top man!