Image noise: Difference between revisions
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p_run''</lang>
The script auto-starts when run (that last line <code><nowiki>p_run''</nowiki></code> is responsible for the auto-start.
FPS is displayed in the window title bar.
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Revision as of 21:28, 1 October 2010
You are encouraged to solve this task according to the task description, using any language you may know.
Generate a random black and white image continuously, showing FPS (frames per second).
Sample image:
C#
<lang csharp>using System; using System.Windows.Forms; using System.Drawing; using System.Drawing.Imaging; using System.Runtime.InteropServices; using System.Linq; using System.ComponentModel; using System.Collections.Generic;
class Program {
static int[] colors = { 0, 255 }; static Size size = new Size(320, 240); static Rectangle rectsize = new Rectangle(new Point(0, 0), size); static int numbytes = size.Width * size.Height * 3;
static PictureBox pb; static BackgroundWorker worker;
static double time = 0; static double frames = 0; static Random rand = new Random();
static IEnumerable<byte> YieldVodoo(int numpixels) { // Yield 3 times same number (i.e 255 255 255) for numpixels/3 times. // Numpixels is number of pixels, it's divided by 3 because it's a RGB image.
for (int i = 0; i < numpixels / 3; i++) { var tmp = colors[rand.Next(colors.Length)];
for (int j = 0; j < 3; j++) { yield return (byte)tmp; } } }
static Image Randimg() { // Low-level bitmaps
var bitmap = new Bitmap(size.Width, size.Height); var data = bitmap.LockBits(rectsize, ImageLockMode.WriteOnly, PixelFormat.Format24bppRgb); var yielder = YieldVodoo(numbytes);
Marshal.Copy( yielder.ToArray<byte>(), // source 0, // start data.Scan0, // scan0 is a pointer to low-level bitmap data numbytes /* number of bytes to write*/);
bitmap.UnlockBits(data); return bitmap; }
static void Main() { // TODO: Fix form size.
var form = new Form(); form.AutoSize = true; form.Text = "Test"; form.FormClosed += delegate { Application.Exit(); };
worker = new BackgroundWorker(); worker.DoWork += delegate { while (true) { try { var a = DateTime.Now; pb.Image = Randimg(); var b = DateTime.Now;
time += (b - a).TotalSeconds; frames += 1;
if (frames == 30) { Console.WriteLine("{0} frames in {1:0.00} seconds. ({2:0} FPS)", frames, time, frames / time);
time = 0; frames = 0; } } catch { // Just pass. } } }; worker.RunWorkerAsync();
pb = new PictureBox(); pb.Size = size; //pb.Dock = DockStyle.Bottom;
form.Controls.Add(pb); form.Show();
Application.Run(); }
}</lang>
Factor
Still learning Factor, my code may suck, please fix.
By some reason, FPS does not show during execution on Linux.
<lang factor>USING: namespaces ui ui.gadgets ui.gadgets.buttons ui.gadgets.tracks ui.gadgets.borders images images.viewer models timers accessors kernel sequences sequences.deep byte-vectors random calendar io math math.functions math.parser prettyprint debugger system ; FROM: models => change-model ;
IN: imagenoise
TUPLE: imgmodel < model content ; SYMBOL: dispimg SYMBOL: num SYMBOL: ttime
- randimg ( -- img )
<image> { 320 240 } >>dim RGB >>component-order ubyte-components >>component-type
dup dim>> product [ { 255 0 } random 3 swap <repetition> ] replicate flatten >byte-vector >>bitmap ;
randimg imgmodel new-model dispimg set-global 0 num set-global 0 ttime set-global
[
now
dispimg get-global [ drop randimg ] change-model num get-global 1 + num set-global now swap time- duration>seconds ttime get-global + ttime set-global num get-global 10 <= [ ] [ num get-global ttime get-global [ / round number>string " FPS" append ] try print
0 num set-global 0 ttime set-global ] if
] 1 nanoseconds every
[ vertical <track>
dispimg get-global <image-control> { 5 5 } <border> f track-add "Test" open-window
] with-ui</lang>
J
<lang j>coclass'example' (coinsert[require)'jzopengl'
P=: 0 : 0 pc p nosize; xywh 0 0 160 100;cc c isigraph opengl; pas 0 0;pcenter; rem form end;
pshow; timer 1;
)
timestamp=: (6!:8) %~ 6!:9
create=:3 :0
ogl=:conew'jzopengl' start=: timestamp sys_timer_base_=: 1 :('p_c_paint_',(;coname),'_') wd P
)
p_run=: 3 : 0
conew'example'
)
destroy=:3 :0
wd 'timer 0' destroy__ogl wd'pclose' codestroy
)
p_close=: destroy
p_c_paint=: 3 : 0
rc__ogl glClear GL_COLOR_BUFFER_BIT glBegin GL_POINTS glVertex _1+2*?16000 2$0 glEnd show__ogl now=. timestamp wd 'pn *',":%now-start start=:now
)
p_run</lang>
The script auto-starts when run (that last line p_run''
is responsible for the auto-start.
FPS is displayed in the window title bar.
Frames will be updated no more often than once every millisecond, to allow for window events to be processed.
FPS would probably be improved if I moved the camera so that I could eliminate the _1+2* from the noise generation line.
PureBasic
<lang PureBasic>#filter=0.02
- Flags =#PB_Window_SystemMenu|#PB_Window_SizeGadget|#PB_Window_MinimizeGadget
If OpenWindow(0,#PB_Ignore,#PB_Ignore,300,100,"PureBasic",#Flags)
AddWindowTimer(0,0,1) Repeat Define x, y, dT, T, TOld, FloatingMedium.f, cnt Define Event=WaitWindowEvent() Select Event Case #PB_Event_Timer Define w=WindowWidth(0), h=WindowHeight(0) CreateImage(0,w+1,h+1) StartDrawing(ImageOutput(0)) For y=0 To h For x=0 To w If Random(1) Plot(x,y,#White) EndIf Next Next StopDrawing() TOld=T: T=ElapsedMilliseconds() dT=(T-TOld) If dT FloatingMedium*(1-#filter)+1000*#filter/dT cnt+1 If Not cnt%10 SetWindowTitle(0,"PureBasic: "+StrF(FloatingMedium,2)+" fps.") EndIf EndIf ImageGadget(0,0,0,w,h,ImageID(0)) EndSelect Until Event=#PB_Event_CloseWindow
EndIf</lang>
Python
<lang python>import Tkinter import Image, ImageTk import random import time
colors = [(0,0,0),(255,255,255)] size = (320,240) pixels = size[0] * size[1]
class App():
def __init__(self, root): self.root = root self.root.title("Test") self.img = Image.new("RGB",size) self.label = Tkinter.Label(root) self.label.pack()
self.time = 0.0 self.frames = 0 self.loop() def loop(self): self.ta = time.time() self.img.putdata([random.choice(colors) for i in range(pixels)]) self.pimg = ImageTk.PhotoImage(self.img) self.label["image"] = self.pimg self.tb = time.time() self.time += (self.tb - self.ta) self.frames += 1
if self.frames == 30: try: self.fps = self.frames / self.time except: self.fps = "INSTANT" print "%d frames in %3.2f seconds (%s FPS)" % (self.frames, self.time, self.fps) self.time = 0 self.frames = 0 self.root.after(1, self.loop)
root = Tkinter.Tk() app = App(root) root.mainloop()</lang>
Tcl
<lang tcl>package require Tk
proc generate {img width height} {
set data {} for {set i 0} {$i<$height} {incr i} {
set line {} for {set j 0} {$j<$width} {incr j} { lappend line [lindex "#000000 #FFFFFF" [expr {rand() < 0.5}]] } lappend data $line
} $img put $data
}
set time 0.0 set count 0
proc looper {} {
global time count set t [lindex [time {generate noise 320 240}] 0] set time [expr {$time + $t}] if {[incr count] >= 30} {
set time [expr {$time / 1000000.0}] set fps [expr {$count / $time}] puts [format "%d frames in %3.2f seconds (%f FPS)" $count $time $fps] set time 0.0 set count 0
} after 1 looper
}
image create photo noise -width 320 -height 240 pack [label .l -image noise] update looper</lang>