Add Ian's offscreen test program.
Same commit as branch-1.3, svn r11287. git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11288 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Albrecht Schlosser
parent
79c64c461d
commit
3f401f4477
1
.gitignore
vendored
1
.gitignore
vendored
@ -197,6 +197,7 @@
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/test/minimum
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/test/native-filechooser
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/test/navigation
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/test/offscreen
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/test/output
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/test/overlay
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/test/pack
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@ -65,6 +65,7 @@ CREATE_EXAMPLE(pack pack.cxx fltk)
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CREATE_EXAMPLE(pixmap pixmap.cxx fltk)
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CREATE_EXAMPLE(pixmap_browser pixmap_browser.cxx "fltk;fltk_images")
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CREATE_EXAMPLE(preferences preferences.fl fltk)
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CREATE_EXAMPLE(offscreen offscreen.cxx fltk)
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CREATE_EXAMPLE(radio radio.fl fltk)
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CREATE_EXAMPLE(resize resize.fl fltk)
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CREATE_EXAMPLE(resizebox resizebox.cxx fltk)
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@ -70,6 +70,7 @@ CPPFILES =\
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minimum.cxx \
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native-filechooser.cxx \
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navigation.cxx \
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offscreen.cxx \
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output.cxx \
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overlay.cxx \
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pack.cxx \
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@ -142,6 +143,7 @@ ALL = \
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minimum$(EXEEXT) \
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native-filechooser$(EXEEXT) \
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navigation$(EXEEXT) \
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offscreen$(EXEEXT) \
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output$(EXEEXT) \
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overlay$(EXEEXT) \
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pack$(EXEEXT) \
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@ -415,6 +417,8 @@ native-filechooser$(EXEEXT): native-filechooser.o $(IMGLIBNAME)
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navigation$(EXEEXT): navigation.o
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offscreen$(EXEEXT): offscreen.o
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output$(EXEEXT): output.o $(FLLIBNAME)
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echo Linking $@...
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$(CXX) $(ARCHFLAGS) $(CXXFLAGS) $(LDFLAGS) -o $@ output.o $(LINKFLTKFORMS) $(LDLIBS)
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@ -45,6 +45,7 @@
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@di:transparency:animated
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@d:cursor:cursor
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@d:labels:label
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@d:offscreen:offscreen
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@d:rotated text:rotated_text
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@d:fl_arc:arc
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@d:fl_curve:curve
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260
test/offscreen.cxx
Normal file
260
test/offscreen.cxx
Normal file
@ -0,0 +1,260 @@
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//
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// "$Id$"
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//
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// Offscreen drawing test program for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2016 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// http://www.fltk.org/COPYING.php
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//
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// Please report all bugs and problems on the following page:
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//
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// http://www.fltk.org/str.php
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//
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/* Standard headers */
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#include <stdlib.h>
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#include <time.h> // time() - used to seed rand()
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/* Fltk headers */
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#include <FL/Fl.H>
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#include <FL/Fl_Double_Window.H>
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#include <FL/x.H>
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#include <FL/Fl_Box.H>
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#include <FL/fl_draw.H>
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static Fl_Double_Window *main_window = 0;
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// constants to define the view etc.
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static const int offscreen_size = 1000;
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static const int win_size = 512;
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static const int first_useful_color = 56;
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static const int last_useful_color = 255;
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static const int num_iterations = 300;
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static const double max_line_width = 9.0;
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static const double delta_time = 0.1;
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/*****************************************************************************/
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class oscr_box : public Fl_Box
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{
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public:
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oscr_box(int x, int y, int w, int h);
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void oscr_drawing(void);
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bool has_oscr() const
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{
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if (oscr) return true;
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return false;
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}
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private:
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void draw();
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int handle(int event);
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// Generate "random" values for the line display
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double random_val(int v) const
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{
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double dr = (double)(rand()) / (double)(RAND_MAX); // 0.0 to 1.0
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dr = dr * (double)(v); // 0 to v
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return dr;
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}
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// The offscreen surface
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Fl_Offscreen oscr;
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// variables used to handle "dragging" of the view within the box
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int x1, y1; // drag start positions
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int xoff, yoff; // drag offsets
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int drag_state; // non-zero if drag is in progress
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int page_x, page_y; // top left of view area
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// Width and height of the offscreen surface
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int offsc_w, offsc_h;
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};
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/*****************************************************************************/
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oscr_box::oscr_box(int x, int y, int w, int h) :
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Fl_Box(x, y, w, h), // base box
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oscr(0), // offscreen is not set at start
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x1(0), y1(0), drag_state(0), // not dragging view
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page_x((offscreen_size - win_size) / 2), // roughly centred in view
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page_y((offscreen_size - win_size) / 2),
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offsc_w(0), offsc_h(0) // offscreen size - initially none
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{ } // Constructor
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/*****************************************************************************/
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void oscr_box::draw()
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{
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int wd = w();
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int ht = h();
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int xo = x();
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int yo = y();
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fl_color(fl_gray_ramp(19)); // a light grey background shade
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fl_rectf(xo, yo, wd, ht); // fill the box with this colour
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// then add the offscreen on top of the grey background
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if (has_oscr()) // offscreen exists
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{
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fl_copy_offscreen(xo, yo, wd, ht, oscr, page_x, page_y);
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}
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else // create offscreen
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{
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// some hosts may need a valid window context to base the offscreen on...
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main_window->make_current();
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offsc_w = offscreen_size;
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offsc_h = offscreen_size;
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oscr = fl_create_offscreen(offsc_w, offsc_h);
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}
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} // draw method
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/*****************************************************************************/
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int oscr_box::handle(int ev)
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{
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int ret = Fl_Box::handle(ev);
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// handle dragging of visible page area - if a valid context exists
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if (has_oscr())
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{
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switch (ev)
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{
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case FL_ENTER:
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main_window->cursor(FL_CURSOR_MOVE);
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ret = 1;
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break;
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case FL_LEAVE:
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main_window->cursor(FL_CURSOR_DEFAULT);
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ret = 1;
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break;
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case FL_PUSH:
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x1 = Fl::event_x_root();
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y1 = Fl::event_y_root();
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drag_state = 1; // drag
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ret = 1;
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break;
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case FL_DRAG:
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if (drag_state == 1) // dragging page
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{
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int x2 = Fl::event_x_root();
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int y2 = Fl::event_y_root();
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xoff = x1 - x2;
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yoff = y1 - y2;
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x1 = x2;
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y1 = y2;
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page_x += xoff;
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page_y += yoff;
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// check the page bounds
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if (page_x < -w())
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{
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page_x = -w();
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}
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else if (page_x > offsc_w)
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{
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page_x = offsc_w;
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}
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if (page_y < -h())
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{
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page_y = -h();
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}
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else if (page_y > offsc_h)
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{
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page_y = offsc_h;
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}
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redraw();
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}
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ret = 1;
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break;
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case FL_RELEASE:
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drag_state = 0;
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ret = 1;
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break;
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default:
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break;
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}
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}
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return ret;
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} // handle
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/*****************************************************************************/
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void oscr_box::oscr_drawing(void)
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{
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Fl_Color col;
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static int icol = first_useful_color;
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static int ox = (offscreen_size / 2);
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static int oy = (offscreen_size / 2);
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static int iters = num_iterations + 1; // Must be set on first pass!
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if (!has_oscr())
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{
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return; // no valid offscreen, nothing to do here
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}
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fl_begin_offscreen(oscr); /* Open the offscreen context for drawing */
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{
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if (iters > num_iterations) // clear the offscreen and start afresh
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{
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fl_color(FL_WHITE);
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fl_rectf(0, 0, offsc_w, offsc_h);
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iters = 0;
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}
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iters++;
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icol++;
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if (icol > last_useful_color)
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{
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icol = first_useful_color;
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}
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col = static_cast<Fl_Color>(icol);
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fl_color(col); // set the colour
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double drx = random_val(offsc_w);
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double dry = random_val(offsc_h);
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double drt = random_val(max_line_width);
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int ex = static_cast<int>(drx);
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int ey = static_cast<int>(dry);
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fl_line_style(FL_SOLID, static_cast<int>(drt));
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fl_line(ox, oy, ex, ey);
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ox = ex;
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oy = ey;
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}
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fl_end_offscreen(); // close the offscreen context
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redraw();
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} // oscr_drawing
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/*****************************************************************************/
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static oscr_box *os_box = 0; // a widget to view the offscreen with
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/*****************************************************************************/
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static void oscr_anim(void *)
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{
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os_box->oscr_drawing(); // if the offscreen exists, draw something
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Fl::repeat_timeout(delta_time, oscr_anim);
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} // oscr_anim
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/*****************************************************************************/
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int main(int argc, char **argv)
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{
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int dim1 = win_size;
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main_window = new Fl_Double_Window(dim1, dim1, "Offscreen demo");
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main_window->begin();
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dim1 -= 10;
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os_box = new oscr_box(5, 5, dim1, dim1);
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main_window->end();
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main_window->resizable(os_box);
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main_window->show(argc, argv);
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srand(time(NULL)); // seed the random sequence generator
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Fl::add_timeout(delta_time, oscr_anim);
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return Fl::run();
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} // main
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//
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// End of "$Id$".
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//
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