R0J0hound's Recent Forum Activity

- R0J0hound
- - Joined 15 Jun, 2009
  - 90 topics • 7,289 posts
- 1
- 24 Apr, 2012
- Quote
I get 17-18 fps on one of my PCs.

Specs:

cpu: intel celeron 1.5 (single core)

gpu: intel 915gm with latest driver (from 2007)

os: Windows XP sp3

web browser: Firefox 11.0

Because of my gpu webgl isn't used in Firefox.

The bottleneck is the rendering. On new computers webgl and canvas rendering both use hardware acceleration. On older computers where the graphics driver is not new enough to provide acceleration you will get a very poor framerate. There are two solutions: upgrage to a newer graphics driver (if one is available) or buy a new pc.

Regardless, the performance should become better with new web browser releases. For one Chrome has a solution in the works that should allow the use of webgl on older systems: http://chrome.blogspot.com/2012/03/faster-and-fancier-graphics.html

EDIT:

Note some acceleration technologies such as "directCanvas" which is used to accelerate the canvas in IE and FF is unavailable in winxp so you'll lose some performance there. Also in linux the graphics drivers generally perform worse than than windows drivers.
- R0J0hound
- - Joined 15 Jun, 2009
  - 90 topics • 7,289 posts
- 1
- 21 Apr, 2012
- Quote
Pode
Finally got around to reviewing your change. Your example wasn't working in Firefox, so I changed the color conversion to use another method.

Anyway updated the first post with R5.
- R0J0hound
- - Joined 15 Jun, 2009
  - 90 topics • 7,289 posts
- 1
- 20 Apr, 2012
- Quote
Instead of creating a line segment at time intervals do it at distance intervals, that way they will be equally spaced.

http://dl.dropbox.com/u/5426011/examples10/dashed_line.capx
- R0J0hound
- - Joined 15 Jun, 2009
  - 90 topics • 7,289 posts
- 1
- 20 Apr, 2012
- Quote
I would also like to see a "pick by comparison" condition added. For now just use a instance variable.

So the CC event:

+Sprite: pick by comparison distance(Sprite.X, Sprite.Y, MouseX, MouseY) Less Than 100

--- do something

Is done in C2 like so:

+Every tick

--- Sprite: set dist to distance(Sprite.X, Sprite.Y, Mouse.X, Mouse.Y)

+Sprite: dist < 100

--- do something
- R0J0hound
- - Joined 15 Jun, 2009
  - 90 topics • 7,289 posts
- 1
- 20 Apr, 2012
- Quote
Re-download the example capx

I made a logic error in event 2.

I changed

Sprite: Move -self.distToMove pixels at self.angToMove

to

Sprite: Move self.distToMove pixels at self.angToMove

self.distToMove is already negative in that event so the sprite would always overshoot the target.
- R0J0hound
- - Joined 15 Jun, 2009
  - 90 topics • 7,289 posts
- 1
- 19 Apr, 2012
- Quote
1)

round(((angle + 360)%360)/45)*45

2a)

+Every Tick:

--- set joyX to 0

--- set joyY to 0

+Left is pressed

--- sub 1 from joyX

+Right is pressed

--- add 1 to joyX

+Up is pressed

--- sub 1 from joyY

+Down is pressed

--- add 1 to joyY

+Every tick

--- set angle to angle(0,0,joyX,joyY)

This will also eliminate opposite key presses (left+right, up+down)

2b)

Just snap the position to the grid at the end of motion.

capx:

http://dl.dropbox.com/u/5426011/examples10/8dirGrid.capx
- R0J0hound
- - Joined 15 Jun, 2009
  - 90 topics • 7,289 posts
- 1
- 18 Apr, 2012
- Quote
Use a variable and add the angle difference of the sprite to it every tick.

The "AngleDiff()" expression is not satisfactory since it doesn't give the direction of the angle difference (CW or CCW). So I used this method:

http://blog.lexique-du-net.com/index.php?post/Calculate-the-real-difference-between-two-angles-keeping-the-sign

capx:

http://dl.dropbox.com/u/5426011/examples10/total_rotation.capx
- R0J0hound
- - Joined 15 Jun, 2009
  - 90 topics • 7,289 posts
- 1
- 18 Apr, 2012
- Quote
seridras
try this:

"$" &int(Balance) &"." &right("00" &(Balance*100)%100,2)
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- R0J0hound
- - Joined 15 Jun, 2009
  - 90 topics • 7,289 posts
- 1
- 17 Apr, 2012
- Quote
It was trial and error. I initially thought the height needed to be doubled or 0.5 but part of the image was cut off, so I tweaked it till I found a value that was close enough to look right.
- R0J0hound
- - Joined 15 Jun, 2009
  - 90 topics • 7,289 posts
- 1
- 17 Apr, 2012
- Quote
0.6 is just a scaling factor. It's used in 4 places in events 3 and 4. If you change 0.6 to 1 the image won't cover the entire canvas.
- R0J0hound
- - Joined 15 Jun, 2009
  - 90 topics • 7,289 posts
- 1
- 17 Apr, 2012
- Quote
Use the "FormatDecimal()" system expression, it's output won't become 2.68e-002.

ex.

FormatDecimal(0.0268, 4) -> "0.0268"

7Soul
That has to do with floating point precision.

Short Answer:

0.1 can't be exactly represented in binary, so a close approximation is used. When adding the number multiple times the inaccuracy grows. It is an issue with all computers. The number will not always be exact but it will be accurate to a certain number of digits, so the error is usually insignificant.

Long Answer:

http://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html
- R0J0hound
- - Joined 15 Jun, 2009
  - 90 topics • 7,289 posts
- 1
- 16 Apr, 2012
- Quote
Fixed it some more:

http://dl.dropbox.com/u/5426011/examples10/sphereTex3b.cap

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R0J0hound

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