c - MikroC, Drawing line graph -

-

i'm trying create function draw line graph within specific window on glcd screen.

lets window's x-axle runs pixel 24 through 205 (left right) , y-axle runs pixel 55 through 5 (low high).

i'll need graph add new value (or dot) whenever new data available. can call graph refreshing within data collection routine. thats no problem.

the latest value needs added right position on graph, 205. need clear line , draw new value/dot. no problem. 

t6963c_line(205, 5, 205, 55, t6963c_black); //clearing whole line t6963c_dot(205, posy, t6963c_white);        //drawing new dot

but i'm not sure is, how shift previous values/dots 1 place left on refreshing (each time new value/dot added on x-position 205), until reaches border of window, 22.

any appriciated!

addition:

int posy1[181]; int i1;   for(i1 = 0; i1 < 181 - 1; i1++)  {      t6963c_dot(i1 + 24, posy1[i1], t6963c_black); //erase old dots  }  for(i1 = 0; i1 < 181 - 1; i1++)  {      posy1[i1] = posy1[i1 + 1]; //shift array  }  posy1[181] = eq; //add new value (eq) array  for(i1 = 0; i1 < 181 - 1; i1++)  {      t6963c_dot(i1 + 24, posy1[i1], t6963c_white); //redraw dots  }

create array of width of data, , store y values in there. then, on adding new value, erase previous dots, shift values in array 1 position down, , redraw them. finally, add y position of new dot @ end of array.

this general idea; there lots of optimizations possible. erase dot on known y position, don't have draw vertical line -- plotting single black dot on enough. also, don't have physically copy every plot[x+1] plot[x] -- can leave array , update offset index modulus data width.


Comments

Post a Comment

Popular posts from this blog

css - Which browser returns the correct result for getBoundingClientRect of an SVG element? -

-
this svg contains rect overflows svg element: <svg id='svg' width='10' height='10'> <rect x='-10' y='-10' width='30' height='30'/> </svg> chrome 28 , opera 12 return getboundingclientrect() svg element width , height of 10. firefox 23 reports width , height of 30. correct? jsfiddle the relevant spec cssom , delegates svg spec if svg element not "have associated css layout box". haven't found definition of "having associated css layout box", correct result seem hinge on definition, getbbox returns 30x30 rect in browsers. this firefox bug fixed now, fix in firefox nightlies , should make through firefox 33 released on 14 october 2014. see bug 530985 details.
Read more

gcc - Calling fftR4() in c from assembly -

-
i trying asm fft implementation www.embeddedsignals.com work. running make gives error: undefined reference fftr4(short*, short*, int) at top of asm have .syntax unified .thumb .global fftr4 .type fftr4, %function and there #define's associate c functions arguments registers followed macros fftr4 function uses. after that, fftr4 called .thumb_func fftr4: stmfd sp!, {r4-r11, lr} mov tmp0, #0 // bit reversed counter mov tmp1, #0 .word 0xf3a2fa92 //rbit r3,r2 //rbit r,n lsl r,#3 and c code follows: void fftr4(short *y, short *x, int n); short x[512]; short y[512]; int i; void loop() { (i=0;i<512;i++) x[i]=0; (i=0;i<512;i=i+8) { x[i+0]=16384; x[i+2]=16384; x[i+4]=-16384; x[i+6]=-16384;} fftr4(y, x, 256); serialusb.println(y[128]); serialusb.println(y[129]); serialusb.println(y[384]); serialusb.println(y[385]); // expected results: //y[128]is 8191; y[129] -8190 y[...
Read more

.htaccess - Matching full URL in RewriteCond -

-
i'm trying block post access site (and return 403), except 2 ip's , 1 url ( http://mydomain.com/about-us/contact-us/ ). here's have: rewritecond %{request_method} post rewritecond %{remote_addr} !=1.2.3.4 rewritecond %{remote_addr} !=4.3.2.1 rewritecond %{request_uri} !^http://mydomain.com/about-us/contact-us/$ rewriterule ^ / [f] these rules allowing access ip properly, contact page still not accessible. i'm not sure i'm using request_uri correctly? i've tried variations relative urls rewritecond %{request_uri} !^/about-us/contact-us$ , rewritecond %{request_uri} !^/about-us/contact-us/$ without luck. what doing wrong please? it looks me rule on file name specific. if relax bit, should work. made few other esthetic tweaks. give try: rewritecond %{request_method} post rewritecond %{remote_addr} !^1.2.3.4 rewritecond %{remote_addr} !^4.3.2.1 rewritecond %{request_uri} !about-us/contact-us rewriterule ^ - [f]
Read more