中国DOS联盟

I accidentally met Pocket Dragon yesterday:
The font of Pocket Dragon is really unique, just like what I write, really a kind of cordial feeling!

The Pocket Dragon is actually not bad, especially its small size. It's a pity that there is no Wubi input method in its free version.

I'm very puzzled about how Pocket Dragon reduces the size of the font library. Calculated according to the national standard:
There are 3755 first-level Chinese characters;
3008 second-level Chinese characters;
682 graphic symbols;
Total: 7445;
I remember that the Chinese character library file under UCDOS uses dot matrix records:
One Chinese character is a 16X16 dot matrix;
One byte of character can record 8 dots;
So one Chinese character needs 32 bytes to record;
To record all Chinese characters, it will be 7445X32 = 238240 bytes;
Plus there are some idles at the beginning and end of the area code, the font library file is more than 260KB in size.
In addition, the English font library still needs more than 4K,

But how does Pocket Dragon manage to make the entire system only dozens of K?

~

The compatibility of Pocket Dragon is not very good. I don't use it now, and I go back to tw. Occasionally use ccdos. What doesn't have errors is a good thing.

The following is a quote from bush on June 7, 2004, 01:48:13 AM:
I am very confused about how Pocket Dragon reduces the font library size. Calculated according to the national standard:
First-level Chinese characters: 3755;
Second-level Chinese characters: 3008;
Graphic symbols: 682;
Total: 7445;
I remember that the Chinese character library file under UCDOS uses dot matrix recording:
One Chinese character is 16X16 dot matrix;
One byte of character can record 8 dots;
So one Chinese character requires 32 bytes to record;
To record all Chinese characters, it will be 7445X32=238240 bytes;
Plus some idle spaces at the beginning and end of the area code, the font library file is more than 260KB in size.
In addition, the English font library still needs more than 4K,

But how does Pocket Dragon do it that the entire system is only tens of K?

~

Pocket Dragon uses vector fonts instead of dot matrix fonts, so it can be made so small

Vector fonts??? Pixel fonts???
Vector fonts = so can be made so small??
Why?

Vector fonts use function curves to represent the stroke directions of Chinese characters. The biggest advantage is that they won't deform when scaled arbitrarily, while dot-matrix fonts will have jagged edges when enlarged. Vector fonts are also divided into single-line, quadratic curve, cubic curve, etc. Pocket Dragon uses a single-line font library, so it is extremely small in size. UCDOS 5 uses a quadratic curve font library, and UCDOS 6 and above and Kingsoft SPDOS 6 and above use a cubic curve font library, which is much more accurate but also much larger in size.

Because vector font libraries need to be restored through calculation, they have certain requirements for computer speed. Also, when printing small fonts, they are not as clear as dot-matrix fonts. Therefore, UCDOS retains 24-dot matrix fonts for printing small characters.

Alas! We still only know how to use 16-dot font libraries when writing programs. Outdated!

The extremely small single-line font library uses what function curves??

（注：原句中“积也就大得多了”应该是“体积也就大得多了”，但按照要求不进行修改，直接翻译问题部分。）

It seems that Pocket Dragon was made by people from Xingning? I used it around the year 2000...

From the Readme of Pocket Dragon, it seems that the author is Li Xiaodong, developed in 1995.
I really want to know where Li Xiaodong is now, can the source code of his XZL be shared?

How to use it?
After I used it, it stopped on the Pocket Dragon interface and didn't move.

to wgx333

Pocket Dragon cannot be used in windowed mode

Good system, who can provide the complete version? (non-gift version)

kongling00.ys168.com provides downloads