Re: Need to plot Open-High-Low-Close bars at end of chart w/o chart repainting and previous bars shifting

[Software FX]

1. If the chart is not scrollable, adding one point requires a recalculation 

of the X-Axis scale as all other bars become a little thinner. A whole 

re-paint is necessary. In other words you can not add the bar to the right 

of the existing bars because there is no room there.

Using the Real-Time API along with scrolling will improve this time 

dramatically.

2. This is by design. If you want space to be reserved for say 100 bars then 

you need to set 100 points even if they are hidden, this is the only way 

Chart FX can know that you want space for 100 bars. If you set the number of 

points to say 3, who is ChartFX going to come up with the 100 you need ?

Check out the Real-Time sample provided it does exactly what you need, it 

allocates a certain amount of points from the beginning and then it just 

replaces existing point in a FIFO basis.

-- 

Francisco Padron

www.chartfx.com

[User (Legacy)]

Hi Francisco,

What you are saying makes perfect sense for a chart with Open-High-Low-Close 

bars that are already filling the entire horizontal width of the chart.

But my charts start off with only a small number of bars on the very left of 

the chart and lots of empty space on the right side of the chart.  When I 

add new bars dynamically the previous bars do move closer together.  The 

bars start off a little off-kilter (too far to the right) from their proper 

X-Axis values, and as bars are added, the previous bars squish together and 

get progressively less off-kilter.

I think that the chart FX Open-High-Low-Close charts have a small visual 

glitch that plots Open-High-Low-Close bars too far to the right when the 

chart´s entire horizontal axis is not completely filled with 

Open-High-Low-Close bars, and instead shows only a few Open-High-Low-Close 

bars on the left of the chart.

Thanks,

Brook

"SoftwareFX Support" <noreply@softwarefx.com> wrote in message 

news:cEvXhOkNGHA.2492@webserver3.softwarefx.com...

> 1. If the chart is not scrollable, adding one point requires a 

> recalculation of the X-Axis scale as all other bars become a little 

> thinner. A whole re-paint is necessary. In other words you can not add the 

> bar to the right of the existing bars because there is no room there.

>

> Using the Real-Time API along with scrolling will improve this time 

> dramatically.

>

> 2. This is by design. If you want space to be reserved for say 100 bars 

> then you need to set 100 points even if they are hidden, this is the only 

> way Chart FX can know that you want space for 100 bars. If you set the 

> number of points to say 3, who is ChartFX going to come up with the 100 

> you need ?

>

> Check out the Real-Time sample provided it does exactly what you need, it 

> allocates a certain amount of points from the beginning and then it just 

> replaces existing point in a FIFO basis.

>

> -- 

> Francisco Padron

> www.chartfx.com

>

[Software FX]

> But my charts start off with only a small number of bars on the very left 

> of the chart and lots of empty space on the right side of the chart

That empty space you mention needs to be occupied by something, using hidden 

values. See my previous answer in bullet 2.

> I think that the chart FX Open-High-Low-Close charts have a small visual 

> glitch that plots Open-High-Low-Close bars too far to the right when the 

> chart´s entire horizontal axis is not completely filled with

Can you post a screenshot of what you mean by this. A sample program that 

reproduces the situation would be even better as I will be able not only to 

tell that´s going on but how to possibly change your code to fix it.

-- 

Francisco Padron

www.chartfx.com