this is 1 of my works in progress. not sure when i will do more with it, so i am sharing it as it is.

--------------------------------

draw 2 ovals.

define 2 points, by entering a date and time for each.

draw a line connecting those points. this line will be the diameter and will be diagonal.

calculate a horizontal diameter. (the oval will be wider than the 2 points)

draw 2 arcs, for the top half and bottom half of the oval.

this will be the outer oval.

the center is marked with a yellow square.

a 2nd smaller oval is drawn.

it will have a width of the time span between the 2 points.

the arc lines are not drawn on the date-time bars. (i don't remember why)

i used different colors on the arcs, to show how they are drawn.

i set the 2 dates as 5/20 and 5/31.

set a chart to 30 days. mine is at 15min 30days

AMZN 15min 5/2022

-------------------------------

it doesn't check if the dates are valid trading days.

could adjust a date with something like this.

to look for a day of week (dow) = 6 or 7. then set a new date var to be a friday. (or monday)

def dow1 = GetDayofWeek(date1);

# calc an offset to friday or original date

def date_adj = if dow1 == 6 then date1 - 1 else if dow1 == 7 then date1 - 2 else 0;

i didn't test what happens if the date is the 1st of month and 1 is subtracted from the date.

------------------------------

reference stuff

arc formulas

https://www.math.net/circle-formula

https://saylordotorg.github.io/text...en in the form (x,smaller is the minor radius.

diagonal line

https://jshingler.github.io/TOS-and...n.html#c-draw-a-line-between-two-price-points

hal_arc

--------------------------------

draw 2 ovals.

define 2 points, by entering a date and time for each.

draw a line connecting those points. this line will be the diameter and will be diagonal.

calculate a horizontal diameter. (the oval will be wider than the 2 points)

draw 2 arcs, for the top half and bottom half of the oval.

this will be the outer oval.

the center is marked with a yellow square.

a 2nd smaller oval is drawn.

it will have a width of the time span between the 2 points.

the arc lines are not drawn on the date-time bars. (i don't remember why)

i used different colors on the arcs, to show how they are drawn.

i set the 2 dates as 5/20 and 5/31.

set a chart to 30 days. mine is at 15min 30days

Ruby:

```
# circle_2points_0e
# https://usethinkscript.com/threads/drawing-a-circle-on-the-chart.10485/
# Drawing a Circle on the chart
#-------------------------------------------
#https://www.math.net/circle-formula
#Given that point (x, y) lies on a circle with radius r centered at the origin of the coordinate plane, it forms a right triangle with sides x and y, and hypotenuse r. This allows us to use the Pythagorean Theorem to find that the equation for this circle in standard form is:
#x^2 + y^2 = r^2
# adjusted radz - pythagorean
# r^2 = x^2 + y^2
# calc y
# y^2 = r^2 - x^2
# y = sqrt ( r^2 - x^2 )
#-------------------------------------------
#https://jshingler.github.io/TOS-and-Thinkscript-Snippet-Collection/TOS%20&%20Thinkscript%20Collection.html#c-draw-a-line-between-two-price-points
# jshingler web site
#C-DRAW A LINE BETWEEN TWO PRICE POINTS
#Hint: Draws a line between to points defined by dates, times and price type
#Developed by RCG3 and StanL on the ThinkScript Lounge 1/2/14
#-------------------------------------------
def na = double.nan;
def bn = barnumber();
def bn1_date = if bn == 1 then GetYYYYMMDD() else bn1_date[1];
input time1 = 1130; #hint time1: EST , Time of first point using the 24-hour clock
input date1 = 20220520; #hint date1:Date of the first point in YYYYMMDD format
input time2 = 1300; #hint time2: EST , Time of second point using the 24-hour clock
input date2 = 20220531; #hint date2: Date of the first point in YYYYMMDD format
input price = close; #hint price: Select the price type desired
def date1ok = (date1 < bn1_date);
input show_dates = no;
addlabel(show_dates and date1ok, "1st date is off the chart", (if date1ok then color.red else color.gray));
#addlabel(show_dates, "1st bar date " + bn1_date, color.yellow);
addlabel(show_dates, "1st date " + date1, color.yellow);
addlabel(show_dates, "2nd date " + date2, color.yellow);
def date= getyyyymmdd();
def x1= if secondsfromtime(time1) == 0 and date1==date then barnumber() else x1[1];
def y1= if secondsfromtime(time1) == 0 and date1==date then price else y1[1];
def x2= if secondsfromtime(time2) == 0 and date2==date then barnumber() else x2[1];
def y2= if secondsfromtime(time2) == 0 and date2==date then price else y2[1];
def x11= highestall(x1);
def y11= highestall(y1);
def x22= highestall(x2);
def y22= highestall(y2);
def slope= (y22-y11)/(x22-x11);
plot line = if x1!=0 and x2[1]==0 then y1+((barnumber()-x1)*slope) else double.nan;
#def Angle_deg = ATan(slope) * 180 / Double.Pi;
#addLabel(yes, "Slope = " + Angle_deg + "degrees", color.CYAN);#Angle printout has no consistency at various aggs
#alert(price crosses line, "Price crossed trendline", alert.once,sound.chimes);# uncomment this line if used as a trendline
# ----------------------------------
# width of 2 points
def point_width = x22 - x11;
# horz width between 2 points
def point_width_half = floor(point_width/2);
# ----------------------------------
# height of 2 points
def maxy = max(y11, y22);
def miny = min(y11, y22);
def point_height = maxy - miny;
def point_height_half = round(point_height/2, 2);
# ----------------------------------
# center point of circle
def centerx = (x11 + point_width_half);
def centery = (miny + point_height_half);
# ----------------------------------
#addlabel(1, "bars |" + x1 + "|" + width + "|" + x22 , color.yellow);
#addlabel(1, "$$ |" + y1 + "|" + height + "|" + y22 , color.yellow);
addlabel(1, "bars " + x22 + " - " + x11 + " = " + point_width + " | 1/2 = " + (point_width/2), color.yellow);
addlabel(1, "$$ " + maxy + " - " + miny + " = " + point_height, color.yellow);
# ----------------------------------
# adjusted rad - pythagorean
input height_factor = 13.0;
#def height0 = halfheight * height_factor;
def point_yfac = point_height_half * height_factor;
# use center x,y point and one x,y point, into pathagorean therum to calc hypot = radius
# horz rad , adjusted bar qty of a radius that spans the circle
def radz = floor(sqrt( point_width_half*point_width_half + point_yfac*point_yfac));
addlabel(1, "x " + point_width_half + " | y " + point_yfac, color.white);
addlabel(1, "adj rad, bars " + radz, color.white);
# ----------------------------------
#////////////////////////////////////////////
# the bars within the circle
#def circle_bars3 = if ( bn >= floor(x11 - radz) and bn <= floor(x22 + radz)) then 1 else 0;
def circle_bars3 = if ( bn >= floor(centerx - radz) and bn <= floor(centerx + radz)) then 1 else 0;
def barx3 = if !circle_bars3 then na else floor(absvalue(centerx - bn));
input test4 = no;
addchartbubble(test4 and circle_bars3,low,
bn + "\n" +
x11 + " x1\n" +
x22 + " x2\n" +
circle_bars3 + "\n" +
centerx + " c\n" +
radz + " z\n"
, (if circle_bars3 then color.yellow else color.gray),no);
# y = sqrt ( r^2 - x^2 )
#def y = sqrt( radz*radz -
def circle_y3 = if !circle_bars3 then na else sqrt( (radz * radz) - (barx3 * barx3) );
input yfactor3 = .08;
#input yfactor = .04;
plot ytop3 = centery + (circle_y3 * yfactor3);
plot ybot3 = centery - (circle_y3 * yfactor3);
ytop3.SetDefaultColor(Color.cyan);
ybot3.SetDefaultColor(Color.blue);
# ----------------------------------
input rad_factor = 0.5;
#input y_factor = 0.5;
def rad_fac_num = floor(x11*rad_factor);
def bnsmall = x11 - rad_fac_num;
def bnbig = x22 + rad_fac_num;
# ---------------------
# pythag radz
#def bnsmall = x11 - rad_fac_num;
#def bnbig = x22 + rad_fac_num;
# ----------------------
addlabel(0, "small bns " + bnsmall + " " + x11, color.cyan);
addlabel(0, "big bns " + x22 + " " + bnbig, color.cyan);
#def circle_bars = if ( bn >= x11 and bn <= x22) then 1 else 0;
def circle_bars = if ( bn >= floor(x11*(1-rad_factor)) and bn <= floor(x22*(1+rad_factor))) then 1 else 0;
# -----------------------------------------
# def y = (pt1price + pt2price ) / 2;
#calc x and y center
#calc
#calc y
# y^2 = r^2 - x^2
# y = sqrt ( r^2 - x^2 )
# radius bars
def rad1 = centerx - x11;
#def rad2 = floor((x11 + x22)/2);
#addlabel(1, "rad0 " + rad0, color.yellow);
addlabel(1, "point_x " + point_width_half, color.yellow);
addlabel(1, "rad1 " + rad1, color.cyan);
#addlabel(1, "rad2 " + rad2, color.cyan);
# 2 pt height diff used to make factor ??
#input rad_factor = 1.0;
# if bars >= circle bars <= , centerx - bn
def barx = if !circle_bars then na else floor(absvalue(centerx - bn)*rad_factor);
#def radx = rad0 * rad_factor;
def radx = point_width_half * rad_factor;
# y = sqrt ( r^2 - x^2 )
# circle_bars
#def circley = if !circle_bars then na else sqrt( (rad0 * rad0) - (barx * barx) );
def circley = if !circle_bars then na else sqrt( (radx * radx) - (barx * barx) );
input yfactor = .08;
#input yfactor = .04;
plot ytop = centery + (circley * yfactor);
plot ybot = centery - (circley * yfactor);
ytop.SetDefaultColor(Color.magenta);
ybot.SetDefaultColor(Color.violet);
addlabel(1, "center x " + centerx, color.yellow);
addlabel(1, "center y " + centery, color.yellow);
# center point
plot ctr = if bn == centerx then centery else na;
ctr.SetPaintingStrategy(PaintingStrategy.SQUARES);
ctr.SetDefaultColor(Color.yellow);
ctr.setlineweight(4);
#ctr.hidebubble();
# --------------------------------
# test codes
input test2 = no;
addchartbubble(test2, low,
bn + "\n" +
centerx + "\n" +
centery
, ( if ( bn == centerx) then color.yellow else color.gray), no);
input test1 = no;
addchartbubble(test1, low,
x1 + "\n" +
y1 + "\n" +
x2 + "\n" +
y2 + "\n" +
x22 + "\n" +
y22 + "\n" +
slope
, color.yellow, no);
#-------------------------------------------
# ref codes
#from tos chat - mobius
def data = getYYYYMMDD();
def year = Round(data/10000, 0);
def month = Round((data % 10000) / 100, 0);
def day = (data % 100);
addLabel(1, "date: " + month + "/" + day + "/" + AsPrice(year), color.white);
#
```

AMZN 15min 5/2022

-------------------------------

it doesn't check if the dates are valid trading days.

could adjust a date with something like this.

to look for a day of week (dow) = 6 or 7. then set a new date var to be a friday. (or monday)

def dow1 = GetDayofWeek(date1);

# calc an offset to friday or original date

def date_adj = if dow1 == 6 then date1 - 1 else if dow1 == 7 then date1 - 2 else 0;

i didn't test what happens if the date is the 1st of month and 1 is subtracted from the date.

------------------------------

reference stuff

arc formulas

https://www.math.net/circle-formula

https://saylordotorg.github.io/text...en in the form (x,smaller is the minor radius.

diagonal line

https://jshingler.github.io/TOS-and...n.html#c-draw-a-line-between-two-price-points

hal_arc

Last edited: