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mandelbrot_pixbuf_zoom.f90
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! This file is part of gtk-fortran, a GTK / Fortran interface library.
! Copyright (C) 2011 The gtk-fortran team
!
! This is free software; you can redistribute it and/or modify
! it under the terms of the GNU General Public License as published by
! the Free Software Foundation; either version 3, or (at your option)
! any later version.
!
! This software is distributed in the hope that it will be useful,
! but WITHOUT ANY WARRANTY; without even the implied warranty of
! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
! GNU General Public License for more details.
!
! Under Section 7 of GPL version 3, you are granted additional
! permissions described in the GCC Runtime Library Exception, version
! 3.1, as published by the Free Software Foundation.
!
! You should have received a copy of the GNU General Public License along with
! this program; see the files LICENSE and LICENSE_EXCEPTION respectively.
! If not, see <http:https://www.gnu.org/licenses/>.
!------------------------------------------------------------------------------
! Contributed by Jerry DeLisle and Vincent Magnin
! Event handling & Zoom : James Tappin
! Last modifications: vmagnin 2020-12-18, 2021-01-22
!------------------------------------------------------------------------------
module handlers
use cairo, only: cairo_paint
use gdk, only: gdk_cairo_set_source_pixbuf
use gdk_pixbuf, only: gdk_pixbuf_get_n_channels, gdk_pixbuf_get_pixels, &
& gdk_pixbuf_get_rowstride, gdk_pixbuf_new
use gtk, only: gtk_application_window_new, gtk_application_new, &
& gtk_window_set_default_size, gtk_box_new, &
& gtk_window_set_child, gtk_box_append, gtk_drawing_area_new, &
& gtk_label_new, gtk_label_set_text, &
& gtk_statusbar_new, gtk_statusbar_push, &
& gtk_widget_queue_draw, &
& gtk_drawing_area_set_draw_func, &
& gtk_widget_set_size_request, gtk_widget_show, gtk_window_new, &
& gtk_window_set_title, gtk_init, g_signal_connect, TRUE, FALSE, &
& GTK_ORIENTATION_VERTICAL, GDK_COLORSPACE_RGB, &
& gtk_gesture_click_new, gtk_widget_add_controller, &
& gtk_event_controller_get_widget, gtk_event_controller_motion_new, &
& gtk_gesture_single_get_current_button, &
& gtk_gesture_single_set_button, gtk_event_controller_scroll_new, &
& GTK_EVENT_CONTROLLER_SCROLL_VERTICAL
use g, only: g_main_context_iteration, &
& g_main_context_pending, &
& g_application_run, g_object_unref
use, intrinsic :: iso_c_binding
implicit none
integer(c_int) :: run_status = TRUE
integer(c_int) :: boolresult
type(c_ptr) :: my_pixbuf, status_bar, rangeid
character(kind=c_char), dimension(:,:,:), pointer :: pixel
integer(c_int) :: nch, rowstride, width, height
logical :: need_point ! even/odd point flag
logical :: computing_flag
character(len=120) :: rangestr
real(c_double) :: mxmin, mxmax, mymin, mymax
integer(c_int) :: mouse_x, mouse_y
contains
! User defined event handlers go here
! This function is needed to update the GUI during long computations.
! https://developer.gnome.org/glib/stable/glib-The-Main-Event-Loop.html
subroutine pending_events ()
do while(IAND(g_main_context_pending(c_null_ptr), run_status) /= FALSE)
! FALSE for non-blocking:
boolresult = g_main_context_iteration(c_null_ptr, FALSE)
end do
end subroutine pending_events
! "It is called whenever GTK needs to draw the contents of the drawing area
! to the screen."
! https://developer.gnome.org/gtk4/stable/GtkDrawingArea.html#gtk-drawing-area-set-draw-func
subroutine draw(widget, my_cairo_context, width, height, gdata) bind(c)
type(c_ptr), value, intent(in) :: widget, my_cairo_context, gdata
integer(c_int), value, intent(in) :: width, height
! We redraw the pixbuf:
call gdk_cairo_set_source_pixbuf(my_cairo_context, my_pixbuf, 0d0, 0d0)
call cairo_paint(my_cairo_context)
end subroutine draw
! Click callback function ("pressed" signal):
subroutine click_cb(gesture, n_press, x, y, gdata) bind(c)
type(c_ptr), value, intent(in) :: gesture, gdata
integer(c_int), value, intent(in) :: n_press
real(c_double), value, intent(in) :: x, y
real(c_double), save :: x0, y0
real(c_double) :: x1, y1
type(c_ptr) :: drawing_area
integer(c_int) :: id
print *, "Button ", gtk_gesture_single_get_current_button(gesture)
print *, n_press, " click(s) at ", int(x), int(y)
if (n_press > 1) then
print *, "Double clicks have no effect!"
return
end if
if (computing_flag) then
print *, "Be patient..."
return
end if
drawing_area = gtk_event_controller_get_widget(gesture)
if (gtk_gesture_single_get_current_button(gesture) == 3) then
! Right button => reset to full set
need_point=.false.
call set_limits
call mandelbrot_set(drawing_area, 1000_c_int)
id = gtk_statusbar_push(status_bar, 0_c_int, &
& "Left|Centre mark: region corner, Right: Reset, "//&
& "Wheel: Zoom in/out"//c_null_char)
else if (.not. need_point) then
need_point=.true.
print *, "First point"
call mand_xy(int(x, c_int), int(y, c_int), x0, y0)
id = gtk_statusbar_push(status_bar, 0_c_int, &
& "Click the opposite corner of the region"//c_null_char)
else if (need_point) then ! Already have one point
need_point=.false.
print *, "Second point"
call mand_xy(int(x, c_int), int(y, c_int), x1, y1)
! If it is not a double-click, we zoom:
if ((min(x0,x1)/=max(x0,x1)).and.(min(y0,y1)/=max(y0,y1))) then
mxmin=min(x0,x1)
mxmax=max(x0,x1)
mymin=min(y0,y1)
mymax=max(y0,y1)
end if
write(rangestr, &
& "('Xmin: ',g11.4,' Xmax: ',g11.4,' Range: ',g11.4,' Ymin: '"//&
& ",g11.4,' Ymax: ', g11.4,' Range: ',g11.4)") &
& mxmin, mxmax, mxmax-mxmin, mymin, mymax, mymax-mymin
call gtk_label_set_text(rangeid, trim(rangestr)//c_null_char)
call mandelbrot_set(drawing_area, 1000_c_int)
id = gtk_statusbar_push(status_bar, 0_c_int, &
& "Left|Centre: mark region corner, "//&
& "Right: Reset, Wheel: Zoom in/out"//c_null_char)
end if
end subroutine click_cb
! Scroll callback function ("scroll" signal):
recursive subroutine scroll_cb(controller, x, y, gdata) bind(c)
type(c_ptr), value, intent(in) :: controller, gdata
real(c_double), value, intent(in) :: x, y
type(c_ptr) :: drawing_area
! Mathematical coordinates:
real(c_double) :: xr, yr, xx, yy
integer(c_int) :: id
print *, "Scroll x,y= ", x, y
! We need to redraw the area:
drawing_area = gtk_event_controller_get_widget(controller)
if (computing_flag) return ! One wheel step at a time !
if (y > 0) then ! Zoom out
call mand_xy(mouse_x, mouse_y, xx, yy)
xr=min(mxmax-mxmin, 1.5_c_double)
yr=min(mymax-mymin, 1.5_c_double)
else ! Zoom in
call mand_xy(mouse_x, mouse_y, xx, yy)
xr = (mxmax-mxmin)/4._c_double
yr = (mymax-mymin)/4._c_double
end if
mxmax=xx+xr
mxmin=xx-xr
if (mxmax > 1._c_double) then
mxmax = 1._c_double
mxmin = mxmax - 2._c_double * xr
else if (mxmin < -2._c_double) then
mxmin = -2._c_double
mxmax = mxmin + 2._c_double * xr
end if
mymin = yy-yr
mymax = yy+yr
if (mymax > 1.5_c_double) then
mymax = 1.5_c_double
mymin = mymax - 2._c_double * yr
else if (mymin < -1.5_c_double) then
mymin = -1.5_c_double
mymax = mymin + 2._c_double * yr
end if
write(rangestr, &
& "('Xmin: ',g11.4,' Xmax: ',g11.4,' Range: ',g11.4,' Ymin: ',"//&
& "g11.4,' Ymax: ', g11.4,' Range: ',g11.4)") &
& mxmin, mxmax, mxmax-mxmin, mymin, mymax, mymax-mymin
call gtk_label_set_text(rangeid, trim(rangestr)//c_null_char)
print *, "Window:", mxmin,mxmax,mymin, mymax
call mandelbrot_set(drawing_area, 1000_c_int)
id = gtk_statusbar_push(status_bar, 0_c_int, &
& "Left|Centre: mark region corner, "//&
& "Right: Reset, Wheel: Zoom in/out"//c_null_char)
end subroutine scroll_cb
! Motion callback function ("motion" signal):
subroutine motion_cb(controller, x, y, gdata) bind(c)
type(c_ptr), value, intent(in) :: controller, gdata
real(c_double), value, intent(in) :: x, y
print *, "Motion x,y= ", x, y
mouse_x = nint(x)
mouse_y = nint(y)
end subroutine motion_cb
subroutine set_limits()
mxmin = -2.0_c_double
mxmax = 1.0_c_double
mymin = -1.5_c_double
mymax = 1.5_c_double
end subroutine set_limits
subroutine mand_xy(ix, iy, x, y)
integer(c_int), intent(in) :: ix, iy
real(c_double), intent(out) :: x, y
real(c_double) :: scx, scy
scx = (mxmax-mxmin)/real(width, c_double) ! x scale
scy = (mymax-mymin)/real(height, c_double) ! y scale
x = mxmin + scx * real(ix, c_double)
y = mymin + scy * real(iy, c_double)
end subroutine mand_xy
!*********************************************
! A tribute to Benoit MANDELBROT (1924-2010)
! http:https://en.wikipedia.org/wiki/Mandelbrot_set
!*********************************************
subroutine mandelbrot_set(my_drawing_area, itermax)
! Whole set: xmin=-2.0_wp, xmax=+1.0_wp, ymin=-1.5_wp, ymax=+1.5_wp, itermax=1000
! Seahorse valley: around x=-0.743643887037151, y=+0.13182590420533, itermax=5000
type(c_ptr), intent(in) :: my_drawing_area
integer(c_int), intent(in) :: itermax
integer(c_int) :: i, j, k
real(c_double) :: x, y ! coordinates in the complex plane
complex(c_double) :: c, z
integer(c_int8_t) :: red, green, blue ! rgb color
real(c_double) :: t0, t1
integer :: it
computing_flag = .true.
call system_clock(it)
t0=real(it, c_double)/1000._c_double
do i=0, width-1
! **************************************************************************
! Needed if you want to display progressively the result during computation.
! We provoke a draw event only once in a while to avoid degrading
! the performances:
! **************************************************************************
if (mod(i, 10_c_int) == 0) then
call gtk_widget_queue_draw(my_drawing_area)
end if
do j=0, height-1
call mand_xy(i, j, x, y)
c = cmplx(x, y, kind=c_double) ! Starting point
z = (0.0_c_double, 0.0_c_double) ! z0
k = 1
do while ((k <= itermax) .and. ((z%re**2 + z%im**2)<4.0_c_double))
z = z*z+c
k = k+1
end do
if (k>itermax) then
! Black pixel:
red = 0
green = 0
blue = 0
else
red = int(min(255, k*2), KIND=c_int8_t)
green = int(min(255, k*5), KIND=c_int8_t)
blue = int(min(255, k*10), KIND=c_int8_t)
end if
! We write in the pixbuffer:
pixel(1,i+1,j+1)=char(red)
pixel(2,i+1,j+1)=char(green)
pixel(3,i+1,j+1)=char(blue)
pixel(4,i+1,j+1)=char(255) ! Opacity (alpha channel)
end do
! **************************************************************************
! You need to manage the GTK events during computation:
! **************************************************************************
call pending_events()
if (run_status == FALSE) return ! Exit if we had a delete event.
end do
call gtk_widget_queue_draw(my_drawing_area)
call system_clock(it)
t1=real(it, c_double)/1000._c_double
print *, "System time = ", t1-t0
computing_flag = .false.
need_point = .false.
end subroutine mandelbrot_set
! The GUI is defined here:
subroutine activate(app, gdata) bind(c)
implicit none
type(c_ptr), value, intent(in) :: app, gdata
type(c_ptr) :: my_window, jb
type(c_ptr) :: my_drawing_area, controller, controller2, controller3
integer :: i, j
integer(c_int) :: id
my_window = gtk_application_window_new(app)
! Properties of the main window :
width = 700
height = 700
call gtk_window_set_default_size(my_window, width, height)
call gtk_window_set_title(my_window, &
& "A tribute to Benoit MANDELBROT (1924-2010)"//c_null_char)
jb = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0_c_int)
call gtk_window_set_child(my_window, jb)
my_drawing_area = gtk_drawing_area_new()
call gtk_widget_set_size_request(my_drawing_area, &
& width, height)
call gtk_drawing_area_set_draw_func(my_drawing_area, &
& c_funloc(draw), c_null_ptr, c_null_funptr)
! We need a gesture controller to detect mouse clicks:
! https://developer.gnome.org/gtk4/stable/GtkGestureClick.html
! https://developer.gnome.org/gtk4/stable/GtkWidget.html#gtk-widget-add-controller
controller = gtk_gesture_click_new()
! 0 to listen to all buttons (button 1 by default):
call gtk_gesture_single_set_button (controller, 0_c_int)
call g_signal_connect(controller, "pressed"//c_null_char, &
& c_funloc(click_cb))
call gtk_widget_add_controller(my_drawing_area, controller)
! And a controller for scrolling:
! https://developer.gnome.org/gtk4/stable/GtkEventControllerScroll.html
controller2 = gtk_event_controller_scroll_new (GTK_EVENT_CONTROLLER_SCROLL_VERTICAL)
call g_signal_connect(controller2, "scroll"//c_null_char, &
& c_funloc(scroll_cb))
call gtk_widget_add_controller(my_drawing_area, controller2)
! And a controller to detect motion and know where is the mouse:
! https://developer.gnome.org/gtk4/stable/GtkEventControllerMotion.html
controller3 = gtk_event_controller_motion_new ()
call g_signal_connect(controller3, "motion"//c_null_char, &
& c_funloc(motion_cb))
call gtk_widget_add_controller(my_drawing_area, controller3)
mouse_x = 0
mouse_y = 0
call gtk_box_append(jb, my_drawing_area)
! Set the initial view
call set_limits()
write(rangestr, &
& "('Xmin: ',g11.4,' Xmax: ',g11.4,' Range: ',g11.4,' Ymin: ',g11.4,' Ymax: ', g11.4,' Range: ',g11.4)") &
& mxmin, mxmax, mxmax-mxmin, mymin, mymax, mymax-mymin
rangeid = gtk_label_new(trim(rangestr)//c_null_char)
call gtk_box_append(jb, rangeid)
status_bar = gtk_statusbar_new()
call gtk_box_append(jb, status_bar)
id = gtk_statusbar_push(status_bar, 0_c_int, &
& "Left|Centre: mark region corner, "//&
& "Right: Reset, Wheel: Zoom in/out"//c_null_char)
call gtk_widget_show(my_window)
! We create a pixbuffer to store the pixels of the image:
my_pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8_c_int, width, height)
nch = gdk_pixbuf_get_n_channels(my_pixbuf)
call c_f_pointer(gdk_pixbuf_get_pixels(my_pixbuf), pixel, &
&int([nch, width, height]))
rowstride = gdk_pixbuf_get_rowstride(my_pixbuf)
! We use char() because we need unsigned integers.
! Our pixbuffer has an Alpha channel but is possible to create a pixbuffer
! with only Red, Green, Blue.
do i=1, height
do j=1, width
pixel(1,j,i)=char(0) ! Red
pixel(2,j,i)=char(0) ! Green
pixel(3,j,i)=char(0) ! Blue
pixel(4,j,i)=char(255) ! Opacity (Alpha channel)
end do
end do
call Mandelbrot_set(my_drawing_area, 1000_c_int)
end subroutine activate
end module handlers
! We create a GtkApplication:
program mandelbrot_pixbuf_zoom
use, intrinsic :: iso_c_binding, only: c_int, c_ptr, c_funloc, c_null_char, c_null_ptr
use gtk, only: gtk_application_new, g_signal_connect, G_APPLICATION_FLAGS_NONE
use g, only: g_application_run, g_object_unref
use handlers, only: activate
implicit none
integer(c_int) :: exit_status
type(c_ptr) :: app
app = gtk_application_new("gtk-fortran.examples.mandelbrot-pixbuf-zoom"//c_null_char, &
& G_APPLICATION_FLAGS_NONE)
call g_signal_connect(app, "activate"//c_null_char, c_funloc(activate), &
& c_null_ptr)
exit_status = g_application_run(app, 0_c_int, [c_null_ptr])
call g_object_unref(app)
end program mandelbrot_pixbuf_zoom