Print1456.htm, Print1456.class and Engine1456.class files.
William Overington
Copyright 2000 William Overington
Here are links to the files needed to run the Print1456 1456 applet landscape together with a copy of the source code of the HTML file. In order to run your own 1456 object code programs using this 1456 applet landscape, please download to a directory of your computer the files Print1456.htm, Print1456.class and Engine1456.class. The Engine1456.class file is exactly the same file as used with the Research1456.class 1456 applet landscape, so if you downloaded it to local storage with the Research1456.class file and you are using the same local directory for the Print1456 1456 applet landscape, there is no need to download it again. Make a copy of Print1456.htm with a different name and then use a text editor, such as Notepad, to edit the source code of this newly created copy of the file Print1456.htm and then view that file in a browser. Please note that Print1456.htm on its own will just display a plain white background. This is because it is a blank landscape ready for 1456 programmers to add 1456 object code into a copy of it. I have prepared several example files, customizing the system as demonstrations. The mouse press function is active for some of the demonstrations.
The demo3.htm file simply draws and labels a diagram of a triangle. Clicking the mouse will have no effect. The start up routine is used to draw the diagram. There is no 1456 object code other than a H (for Halt) after the entry point for a mouse click.
The demo4.htm file has the following features. The colour toolbar is added by the start up routine. Clicking the mouse on the white background area causes text to be printed. Clicking on a section of the colour toolbar changes the text that is displayed at subsequent clicks on the white area.
The demo5.htm file has the following features. The colour toolbar is added by the start up routine. Clicking the mouse on the white background area causes text to be drawn. Clicking the mouse on a section of the colour toolbar changes the size of the text used for subsequent text drawing. This is achieved by using a software interrupt.
The demo6.htm file is an extension of the demo5.htm demonstration. Here there is also an active area in the right 20 pixels of the white area of the screen. Clicking in this active area will switch on or switch off the event splitting and the colour toolbar. Please note how one may switch the colour toolbar on, change the size of the lettering, then switch the colour toolbar off, then click on the main area of the screen and produce lettering in the selected size.
For both of these demonstrations, analysing the source code of the HTML files may prove useful to people learning to use 1456 object code.
Please remember that all of the differences between demo3.htm, demo4.htm, demo5.htm and demo6.htm are produced by differences in the 1456 object code in the HTML files.
It is hoped that readers may wish to try producing their own demonstrations.
Here is the source code of the file Print1456.htm.
<html>
<head>
</head>
<body bgcolor="#804000">
<p align=center>
<applet code="Print1456.class" width=700 height=400>
<param name="SOFTWARE01" value="1:H">
<param name="SOFTWARE02" value="41:H">
<param name="SOFTWARE03" value="H">
<param name="SOFTWARE04" value="70:H">
<param name="SOFTWARE05" value="H">
<param name="SOFTWARE06" value="H">
<param name="SOFTWARE07" value="71:H 72:H 73:H 74:H">
<param name="SOFTWARE08" value="75:H 76:H 77:H">
<param name="SOFTWARE09" value="H">
In operation, Print1456.class provides 10 possible entry
points.
At the moment of start up there is one entry point
available.
1: is for start up.
After start up, at any time either 1 entry point is
available or 8 entry points are available, depending upon
whether the 1456 applet landscape Print1456.class has been
instructed, using the software interrupt mechanism, to use
1 entry point or to use 8 entry points.
When there is one entry point, which is the default
situation at start up, or after a 12? software interrupt.
41: is for the mouse being pressed.
When there are eight entry points, achieved after a 11?
software interrupt.
The 11? could be in the 1: routine or the 41: routine as
desired.
Once the entry points are split in this way the 41: entry
point is not available unless a 12? software interrupt
is used.
70: is when y is less than 350.
71: is when y is 350 or greater and x is less than 100.
72: is when y is 350 or greater and x is 100 or greater and
less than 200.
73: is when y is 350 or greater and x is 200 or greater and
less than 300.
74: is when y is 350 or greater and x is 300 or greater and
less than 400.
75: is when y is 350 or greater and x is 400 or greater and
less than 500.
76: is when y is 350 or greater and x is 500 or greater and
less than 600.
77: is when y is 350 or greater and x is 600 or greater and
less than 700.
Please know that a 21? software interrupt will turn on the
colour toolbar, which aligns with these selected regions.
A 22? software interrupt will replace the colour toolbar
and anything drawn on it with a white background.
Please know that the colour toolbar and the splitting of
the entry points are independent of each other.
It may well be that typical usage will be to use both
together, yet the 1456 programmer may, if he or she so
chooses, split the entry points and not use the colour
toolbar, perhaps writing a text character within each area.
Also, the colour toolbar is simply filled rectangles
drawn on the display screen by the 1456 applet landscape.
An identical display could be produced by drawing
filled rectangles using 1456 object code.
The 1456 programmer may, if he or she so chooses, produce
his or her own active areas on the screen using eutodraw
graphics commands and by using the values of the
coordinates of the mouse button press with condition tests
and conditional jump instructions just using entry points
1: and 41: if so desired.
Another possibility is to use 11? at start up and to use
the split entry points and also have other active areas
identified using 1456 object code starting at the 70:
entry label.
Regardless of whether one entry point or entry points are
being used, the position coordinates of the mouse at a
mouse press are placed in integers 5 and 6, x and y
respectively.
The shift key being down at the mouse press causes
a 1 to be placed in integer 7.
The shift key being up at the mouse press causes
a 0 to be placed in integer 7.
The control key being down at the mouse press causes
a 1 to be placed in integer 8.
The control key being up at the mouse press causes
a 0 to be placed in integer 8.
The alt key being down at the mouse press causes
a 1 to be placed in integer 9.
The alt key being up at the mouse press causes
a 0 to be placed in integer 9.
There are various features provided in the software
interrupt service routine.
The command 1? will, for this particular 1456
applet landscape, place the string
"The 1456 engine in action."
into ms1456[19].
11? will split the entry points.
12? will unsplit the entry points.
21? will turn on the colour toolbar.
22? will turn off the colour toolbar.
The lettering that is drawn by eutodraw commands
may have its size and style changed as follows.
1120? SansSerif PLAIN 12 point
1122? SansSerif ITALIC 12 point
1180? SansSerif PLAIN 18 point
1182? SansSerif ITALIC 18 point
1240? SansSerif PLAIN 24 point
1242? SansSerif ITALIC 24 point
1360? SansSerif PLAIN 36 point
1362? SansSerif ITALIC 36 point
1480? SansSerif PLAIN 48 point
1482? SansSerif ITALIC 48 point
1600? SansSerif PLAIN 60 point
1602? SansSerif ITALIC 60 point
1720? SansSerif PLAIN 72 point
1722? SansSerif ITALIC 72 point
</applet>
<br>
<body>
Readers are invited to send feedback by email. Please email the author to send details of usage, stating which type of computer is being used. In particular, I have only tried this on two PCs and would appreciate knowing how the system works on other platforms.
1456 object code
Copyright 2000 William Overington