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module render
implicit none
type, abstract :: renderer
integer::y
integer::max_width
contains
procedure::render_proportional
procedure(initialize), deferred::initialize
procedure(calculate_width), deferred::text_width
procedure(calculate_height), deferred::text_height
procedure(calculate_visibility), deferred::is_text_visible
procedure(draw_text), deferred::draw_porportional
procedure(calculate_width), deferred::preformatted_width
procedure(calculate_height), deferred::preformatted_height
procedure(calculate_visibility), deferred::is_preformatted_visible
procedure(draw_text), deferred::draw_preformatted
end type renderer
abstract interface
subroutine initialize(self)
import::renderer
class(renderer)::self
end subroutine initialize
end interface
abstract interface
function calculate_width(self, text)
import::renderer
class(renderer)::self
character(*), intent(in)::text
integer::calculate_width
end function calculate_width
end interface
abstract interface
function calculate_height(self, text)
import::renderer
class(renderer)::self
character(*), intent(in)::text
integer::calculate_height
end function calculate_height
end interface
abstract interface
subroutine draw_text(self, text)
import::renderer
class(renderer)::self
character(*), intent(in)::text
end subroutine draw_text
end interface
abstract interface
function calculate_visibility(self, text)
import::renderer
class(renderer)::self
character(*), intent(in)::text
logical::calculate_visibility
end function calculate_visibility
end interface
contains
function width_of_line(r, text, startpos, endpos)
implicit none
class(renderer)::r
character(*), intent(in)::text
integer, intent(in)::startpos, endpos
integer::width_of_line
integer::my_start, my_end
my_end = endpos
if(endpos <= 0) then
my_end = len_trim(text)
end if
my_start = startpos
if(startpos <= 0) then
my_start = 1
end if
if(my_end <= my_start) then
width_of_line = 0
else
width_of_line = r%text_width(text(my_start:my_end))
end if
end function width_of_line
function wrap_line(r, text, startpos) result(endpos)
implicit none
class(renderer)::r
character(*), intent(in)::text
integer, intent(in)::startpos
integer::endpos
integer::my_start
integer::w
my_start = startpos
if(startpos == 0) then
my_start = 1
end if
endpos = len_trim(text)
w = width_of_line(r, text, my_start, endpos)
do while(w > r%max_width)
endpos = endpos - 1
do while(text(endpos:endpos) /= ' ' .and. text(endpos:endpos) /= '-')
endpos = endpos - 1
end do
w = width_of_line(r, text, my_start, endpos)
end do
end function wrap_line
subroutine render_proportional(r, text)
implicit none
class(renderer)::r
character(*)::text
integer::startpos, endpos
if(len_trim(text) == 0) then
if(r%is_text_visible(" ")) then
call r%draw_porportional("")
end if
r%y = r%y + r%text_height(" ")
else
startpos = 1
endpos = wrap_line(r, text, startpos)
do while(endpos > startpos)
if(r%is_text_visible(text(startpos:endpos))) then
call r%draw_porportional(text(startpos:endpos))
end if
r%y = r%y + r%text_height(text(startpos:endpos))
! Advance string positions
startpos = endpos+1
do while(text(startpos:startpos) == ' ')
startpos = startpos + 1
end do
endpos = wrap_line(r, text, startpos)
end do
end if
end subroutine render_proportional
subroutine render_preformatted(r, text)
implicit none
class(renderer)::r
character(*)::text
if(r%is_preformatted_visible(text)) then
call r%draw_preformatted(text)
end if
r%y = r%y + r%preformatted_height(text)
end subroutine render_preformatted
end module render
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