Sprites flashing, spazzing

[paperclipz]

I finally got one of my sprites working. Heres the code im using

code:

const fileName1 := "spawnwalkingwest.gif" const fileName := "spawnwalkingeast.gif" const fileName2 := "spawnattackwest.gif" const fileName3 := "spawnattackeast.gif" var numFrames : int := Pic.Frames (fileName) var numFrames1 : int := Pic.Frames (fileName1) var numFrames2 : int := Pic.Frames (fileName2) var numFrames3 : int := Pic.Frames (fileName3) var stand:int:= Pic.FileNew ("spawnstanding.bmp") var x:int var y:int var sora_x, sora_y:int % Load the picture var sora_stand: int sora_stand:=Sprite.New(stand) var delayTime : int var pics : array 1 .. numFrames of int var pics1 : array 1 .. numFrames1 of int var pics2 : array 1 .. numFrames2 of int var pics3 : array 1 .. numFrames3 of int Pic.FileNewFrames (fileName, pics, delayTime) Pic.FileNewFrames (fileName1, pics1, delayTime) Pic.FileNewFrames (fileName2, pics2, delayTime) Pic.FileNewFrames (fileName3, pics3, delayTime) % Display the pictures x:=100 y:=10 loop sora_x:= x+2 sora_y:= y-1 Sprite.SetPosition (sora_stand,sora_x,sora_y,false) Sprite.Show (sora_stand) var chars : array char of boolean             Input.KeyDown (chars)                         if chars ('a')and chars(KEY_RIGHT_ARROW) then                          Pic.DrawFrames (pics3, x, y, picMerge, upper (pics3), 70, true)                end if                        if chars ('a')and chars(KEY_LEFT_ARROW) then                          Pic.DrawFrames (pics2, x, y, picMerge, upper (pics2), 70, true)                end if                         if chars (KEY_LEFT_ARROW) then                 x:=x-10                 Pic.DrawFrames (pics1, x, y, picMerge, upper (pics1), 55, true)                   end if             if chars (KEY_RIGHT_ARROW) then                 x:=x+10             Pic.DrawFrames (pics, x, y, picMerge, upper (pics), 55, true)                end if                                                     end loop

whats going on is whenever im trying to move, the main picture of him standing in one place consistently shows up. When i move west, a black screen pops up surrounding the vicinity of the sprite and red/white dots show up in this box. If anyone knows what to help me with it would be much appreciated. Thanks.

[isaiahk9]

I am not positive but I believe that it is because you are using the "flashy" animation technique. To make it un-flashy, all you need to do is put setscreen("offscreenonly") on the top of the code, and then whenever you want to draw or display something put View.Update. That should take care of your problem, but I'll monitor this post in case it doesn't.

[Saad]

isaiahk9 @ Tue May 06, 2008 5:26 pm wrote:

I am not positive but I believe that it is because you are using the "flashy" animation technique. To make it un-flashy, all you need to do is put setscreen("offscreenonly") on the top of the code, and then whenever you want to draw or display something put View.Update. That should take care of your problem, but I'll monitor this post in case it doesn't.

Let me provide more insight into the "flashy" animation technique. What's really going on is that as your drawing something it is instantly drawn in the screen. This means you keep saying each thing getting drawn. As a result it creates flickering. What doing View.Set ("offscreenonly") does is create an off-screen buffer onto which the graphics are drawn. When View.Update the changes are applied to the screen.

This link goes over how to use each in more detail and with some code.