Segments In Computer Graphics

 Segments

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• The segment name is zero then it is called an undefined segment.

• BD created for a code that is not specified where it belongs then it belongs to zero segments, with no visibility.

• Segment name can be integers from 1 to max number.

Create Segment

create_segment (seg_name)

{

variables:

now_open (global val = 0), num_seg, seg_start [num_seg], seg_size [num_seg], trans_x [num_seg], visibility [num_seg], trans_y [num_seg], angle [num_seg], scale [num_seg], free

If now_open > 0 then,

Error: "Segment already opened"

If seg_name < 1 or seg_name > num_seg then,

Error: "Invalid segment name"

If seg_size [seg_name] > 0 then,

Error: "Segment already exists"

seg_start [seg_name] = free

seg_size [seg_name] = 0

visibility [seg_name] = visibility [0]

trans_x [seg_name] = trans_x [0]

trans_y [seg_name] = trans_y [0]

scale_x [seg_name] = scale_x [0]

scale_y [seg_name] = scale_y [0]

angle [seg_name] = angle [0]

now_open = seg_name

}

Close Segment

close_segment ()

{

If now_open  = 0 then,

Error: "Segment already closed"

delete_seg (0)

seg_start [0] = free

seg_size [0] = 0

now_open = 0

}

Delete Segment

delete_segment (seg_name)

{

If (seg_name < 1 or seg_name > num_seg) then,

Error: "Invalid segment name"

If now_open = seg_name then,

Error: "Segment open" 

If seg_size [seg_name] = 0 then,

Error: "Segment doesn't exists"

put = seg_start [seg_name]

size = seg_size [seg_name]

get = put + size

while (get < free)

{

df_op [put] = df_op [get]

df_x [put] = df_x [get]

df_y [put] = df_y [get]

put ++

get ++

}

free = put

for (i = 0 to num_seg)

{

if (seg_start [i] > seg_start [seg_name])

{

seg_start [i] = seg_start [i] - size

}

}

seg_size [seg_name] = 0

if (visibility [seg_name] == 1) then,

new_frame ()

}

Delete All

delete_all ()

{

for (i = 0 to num_seg)

{

seg_start [i] = 1

seg_size [i] = 0

}

free = 1

now_open = 0

new_frame ()

}

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