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109 lines
4.3 KiB
Plaintext
109 lines
4.3 KiB
Plaintext
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Mouse Functions for C02 Programs
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This module provides functions to control and read the status of the
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mouse on systems that support it.
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At the beginning of the program use the directives
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#include <template.h02>
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The following mouse constants are defined:
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#MHIDE Hide mouse
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#MSHOW Show mouse with default cursor
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#MCSTM Show mouse with custom cursor
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#MBLEFT Bitmask - Left Mouse Button
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#MBMIDL Bitmask - Middle Mouse Button
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#MBRGHT Bitmask - Right Mouse Button
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along with the following variables:
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int mousex; Mouse X Position
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int mousey; Mouse Y Position
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char mouseb; Mouse Button Status
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and the following functions:
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r = mcnfg(m); Configures the mouse to mode m. Valid modes are:
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#MHIDE - Hide the mouse cursor and disable the mouse.
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#MSHOW - Display the mouse cursor, enable the mouse,
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and set the cursor to the default image.
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#MCSTM - Display the mouse cursor and enable the mouse,
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but do not set the cursor image. This mode is
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not supported on all systems.
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Returns 0 if the mouse was successfully enabled, or
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$FF if the mode is invalid, the mouse is not connected,
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or the system lacks mouse support.
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r = mread(); Reads the mouse and sets the following values:
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mousex - Horizontal position of the mouse, relative
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to the screen pixel positions.
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mousey - Vertical position of the mouse, relative
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to the screen positions.
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mouseb - Status of the mouse buttons. The status of a
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button can be determined using the expression
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mouseb & m, where m is the constant #MBLEFT,
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#MBRGHT, or #MBMIDL. This will evaluate to m
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if the button is pressed, or 0 if it is not.
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Returns 0 if the mouse was successfully read, or $FF if
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the mouse dis1abled or the system lacks mouse support.
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If the read is unsuccesful, then the mousex, mousey, and
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mouseb variables will contain unpredictable values.
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Note: This module has no external requirements. Implementation varies by
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system.
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Commander X16
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Uses the Kernal functions mouse_config and mouse_get. Two additional
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functions are defined.
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r = mcnfgs(m, f); Configures the mouse and sets the screen scale.
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Valid values for f are the additional constants:
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#MSNONE - Do not change the scale.
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#MSLOW - Set scale to 320x240.
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#MSHIGH - Set scale to 640x480.
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Valid values for m and return values are the same as
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for mcnfg().
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The function mcnfg() sets the scale to 320x480, which
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is the screen size set by the x16.h02 system module.
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mscan(); Queries the mouse and retrieves the values for a
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subsequent mread().
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This is called by the default interrupt service routine,
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so it does not need to be called unless that routine is
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entirely replaced.
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The mousex, mousey, and mouseb variables are aliased to the ABI registers
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r0, r1, and r2l, respectively. Calling any functions that use the ABI
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registers may overwrite these variables.
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Apple II - Not Implemented
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mcnfg() and mread() will use the routines SetMouse and ReadMouse, respectively.
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Vic 20 - Not Implemented
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Since the screen resolution is less than 255x255, the easiest way to handle this
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is to assume a mouse that emulates paddles and reuse the paddle code.
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Commodore 64 and 128 - Not Implementated
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A machine language driver program is needed to read a mouse in proportional mode.
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This could be either external to the module or included in it.
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