124 lines
3.6 KiB
C++
124 lines
3.6 KiB
C++
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#include <gtkmm.h>
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class MyWin : public Gtk::Window{
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//Child Widgets
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Gtk::DrawingArea draw_area;
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Gtk::ColorButton color_btn;
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Gtk::Label main_label;
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Gtk::Box main_box,btn_box;
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//Color Setting
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Gdk::RGBA m_color;
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Cairo::RefPtr<Cairo::ImageSurface> surface;
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//Gesture to draw
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Glib::RefPtr<Gtk::GestureMultiPress> gesture;
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Glib::RefPtr<Gtk::GestureDrag> drag;
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double start_x,start_y;
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//Signal Handlers
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bool draw_event(const Cairo::RefPtr<Cairo::Context> &context){
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//Show context
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context->set_source(surface,0,0);
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context->paint();
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return true;
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}
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void draw_brush(double x,double y){
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//Create Draw Brush
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auto cr=Cairo::Context::create(surface);
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cr->arc(x, y, 3, 0, 2 * G_PI);
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//Set Color
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cr->set_source_rgba(m_color.get_red(),m_color.get_green(),
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m_color.get_blue(),m_color.get_alpha());
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//Fill Color and Delete the brush
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cr->fill();
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cr.clear();
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draw_area.queue_draw();
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}
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void button_press(int n_press, double x, double y){
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if(surface){
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//Clear the content in draw area
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auto cr=Cairo::Context::create(surface);
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cr->set_source_rgb(1,1,1);
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cr->paint();
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cr.clear();
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draw_area.queue_draw();
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}
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}
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void drag_begin(double x,double y){
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//The Begin
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start_x=x;start_y=y;
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draw_brush(x,y);
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}
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void drag_progress(double x,double y){
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//Progress and end
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draw_brush(x+start_x,y+start_y);
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}
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void color_set(){
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m_color=color_btn.get_rgba();
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}
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public:
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MyWin()
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:main_label("Select a color"),
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main_box(Gtk::ORIENTATION_HORIZONTAL,5),
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btn_box(Gtk::ORIENTATION_VERTICAL,5)
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{
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//Ininalize window
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set_icon_name("org.gtk.daleclack");
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set_default_size(640,480);
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//Color set panel
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btn_box.pack_start(main_label,Gtk::PACK_SHRINK);
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btn_box.pack_start(color_btn,Gtk::PACK_SHRINK);
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btn_box.set_halign(Gtk::ALIGN_CENTER);
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btn_box.set_valign(Gtk::ALIGN_CENTER);
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//Add Gesture
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gesture=Gtk::GestureMultiPress::create(draw_area);
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gesture->set_button(GDK_BUTTON_SECONDARY);
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gesture->signal_pressed().connect(sigc::mem_fun(*this,&MyWin::button_press));
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drag=Gtk::GestureDrag::create(draw_area);
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drag->set_button(GDK_BUTTON_PRIMARY);
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drag->signal_drag_begin().connect(sigc::mem_fun(*this,&MyWin::drag_begin));
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drag->signal_drag_update().connect(sigc::mem_fun(*this,&MyWin::drag_progress));
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drag->signal_drag_end().connect(sigc::mem_fun(*this,&MyWin::drag_progress));
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//Create a Surface
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surface=Cairo::ImageSurface::create(Cairo::FORMAT_ARGB32,600,480);
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//Set Default Color
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m_color.set_blue(0);
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m_color.set_green(0);
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m_color.set_red(0);
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m_color.set_alpha(1);
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color_btn.set_rgba(m_color);
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color_btn.signal_color_set().connect(sigc::mem_fun(*this,&MyWin::color_set));
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//Initalize main widget
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draw_area.set_size_request(600,480);
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draw_area.signal_draw().connect(sigc::mem_fun(*this,&MyWin::draw_event));
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main_box.pack_start(draw_area);
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main_box.pack_start(btn_box,Gtk::PACK_SHRINK);
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main_box.set_border_width(10);
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add(main_box);
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show_all_children();
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}
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};
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int main(int argc,char **argv){
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auto app=Gtk::Application::create(argc,argv,"org.gtk.daleclack");
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MyWin window;
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return app->run(window);
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}
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