mirror of
https://github.com/tesseract-ocr/tesseract.git
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236 lines
8.9 KiB
C++
236 lines
8.9 KiB
C++
// Copyright 2007 Google Inc. All Rights Reserved.
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//
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// Author: Joern Wanke
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Simple drawing program to illustrate ScrollView capabilities.
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//
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// Functionality:
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// - The menubar is used to select from different sample styles of input.
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// - With the RMB it is possible to change the RGB values in different
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// popup menus.
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// - A LMB click either draws point-to-point, point or text.
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// - A LMB dragging either draws a line, a rectangle or ellipse.
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// Include automatically generated configuration file if running autoconf.
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#ifdef HAVE_CONFIG_H
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#include "config_auto.h"
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#endif
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#ifndef GRAPHICS_DISABLED
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#include "scrollview.h"
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#include "svmnode.h"
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#include <stdlib.h>
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#include <iostream>
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// The current color values we use, initially white (== ScrollView::WHITE).
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int rgb[3] = { 255, 255, 255 };
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class SVPaint : public SVEventHandler {
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public:
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explicit SVPaint(const char* server_name);
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// This is the main event handling function that we need to overwrite, defined
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// in SVEventHandler.
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void Notify(const SVEvent* sv_event);
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private:
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// The Handler take care of the SVET_POPUP, SVET_MENU, SVET_CLICK and
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// SVET_SELECTION events.
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void PopupHandler(const SVEvent* sv_event);
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void MenuBarHandler(const SVEvent* sv_event);
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void ClickHandler(const SVEvent* sv_event);
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void SelectionHandler(const SVEvent* sv_event);
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// Convenience functions to build little menus.
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SVMenuNode* BuildPopupMenu();
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SVMenuNode* BuildMenuBar();
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// Our window.
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ScrollView* window_;
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// The mode we are in when an SVET_CLICK or an SVET_SELECTION event occurs.
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int click_mode_;
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int drag_mode_;
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// In the point-to-point drawing mode, we need to set a start-point the first
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// time we call it (e.g. call SetCursor).
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bool has_start_point_;
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};
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// Build a sample popup menu.
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SVMenuNode* SVPaint::BuildPopupMenu() {
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SVMenuNode* root = new SVMenuNode(); // Empty root node
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// Initial color is white, so we all values to 255.
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root->AddChild("R", // Shown caption.
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1, // assoc. command_id.
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"255", // initial value.
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"Red Color Value?"); // Shown description.
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root->AddChild("G", 2, "255", "Green Color Value?");
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root->AddChild("B", 3, "255", "Blue Color Value?");
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return root;
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}
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// Build a sample menu bar.
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SVMenuNode* SVPaint::BuildMenuBar() {
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SVMenuNode* root = new SVMenuNode(); // Empty root node
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// Create some submenus and add them to the root.
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SVMenuNode* click = root->AddChild("Clicking");
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SVMenuNode* drag = root->AddChild("Dragging");
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// Put some nodes into the submenus.
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click->AddChild("Point to Point Drawing", // Caption.
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1); // command_id.
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click->AddChild("Point Drawing", 2);
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click->AddChild("Text Drawing", 3);
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drag->AddChild("Line Drawing", 4);
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drag->AddChild("Rectangle Drawing", 5);
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drag->AddChild("Ellipse Drawing", 6);
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return root;
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}
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// Takes care of the SVET_POPUP events.
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// In our case, SVET_POPUP is used to set RGB values.
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void SVPaint::PopupHandler(const SVEvent* sv_event) {
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// Since we only have the RGB values as popup items,
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// we take a shortcut to not bloat up code:
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rgb[sv_event->command_id - 1] = atoi(sv_event->parameter);
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window_->Pen(rgb[0], rgb[1], rgb[2]);
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}
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// Takes care of the SVET_MENU events.
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// In our case, we change either the click_mode_ (commands 1-3)
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// or the drag_mode_ (commands 4-6).
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void SVPaint::MenuBarHandler(const SVEvent* sv_event) {
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if ((sv_event->command_id > 0) && (sv_event->command_id < 4)) {
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click_mode_ = sv_event->command_id;
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has_start_point_ = false;
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} else { drag_mode_ = sv_event->command_id; }
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}
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// Takes care of the SVET_CLICK events.
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// Depending on the click_mode_ we are in, either do Point-to-Point drawing,
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// point drawing, or draw text.
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void SVPaint::ClickHandler(const SVEvent* sv_event) {
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switch (click_mode_) {
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case 1: //Point to Point
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if (has_start_point_) { window_->DrawTo(sv_event->x, sv_event->y);
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} else {
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has_start_point_ = true;
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window_->SetCursor(sv_event->x, sv_event->y);
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}
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break;
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case 2: //Point Drawing..simulated by drawing a 1 pixel line.
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window_->Line(sv_event->x, sv_event->y, sv_event->x, sv_event->y);
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break;
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case 3: //Text
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// We show a modal input dialog on our window, then draw the input and
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// finally delete the input pointer.
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char* p = window_->ShowInputDialog("Text:");
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window_->Text(sv_event->x, sv_event->y, p);
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delete [] p;
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break;
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}
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}
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// Takes care of the SVET_SELECTION events.
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// Depending on the drag_mode_ we are in, either draw a line, a rectangle or
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// an ellipse.
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void SVPaint::SelectionHandler(const SVEvent* sv_event) {
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switch (drag_mode_) {
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//FIXME inversed x_size, y_size
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case 4: //Line
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window_->Line(sv_event->x, sv_event->y,
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sv_event->x - sv_event->x_size,
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sv_event->y - sv_event->y_size);
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break;
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case 5: //Rectangle
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window_->Rectangle(sv_event->x, sv_event->y,
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sv_event->x - sv_event->x_size,
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sv_event->y - sv_event->y_size);
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break;
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case 6: //Ellipse
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window_->Ellipse(sv_event->x - sv_event->x_size,
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sv_event->y - sv_event->y_size,
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sv_event->x_size, sv_event->y_size);
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break;
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}
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}
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// The event handling function from ScrollView which we have to overwrite.
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// We handle CLICK, SELECTION, MENU and POPUP and throw away all other events.
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void SVPaint::Notify(const SVEvent* sv_event) {
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if (sv_event->type == SVET_CLICK) { ClickHandler(sv_event); }
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else if (sv_event->type == SVET_SELECTION) { SelectionHandler(sv_event); }
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else if (sv_event->type == SVET_MENU) { MenuBarHandler(sv_event); }
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else if (sv_event->type == SVET_POPUP) { PopupHandler(sv_event); }
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else {} //throw other events away
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}
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// Builds a new window, initializes the variables and event handler and builds
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// the menu.
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SVPaint::SVPaint(const char *server_name) {
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window_ = new ScrollView("ScrollView Paint Example", // window caption
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0, 0, // x,y window position
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500, 500, // window size
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500, 500, // canvas size
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false, // whether the Y axis is inversed.
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// this is included due to legacy
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// reasons for tesseract and enables
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// us to have (0,0) as the LOWER left
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// of the coordinate system.
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server_name); // the server address.
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// Set the start modes to point-to-point and line drawing.
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click_mode_ = 1;
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drag_mode_ = 4;
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has_start_point_ = false;
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// Bild our menus and add them to the window. The flag illustrates whether
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// this is a menu bar.
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SVMenuNode* popup_menu = BuildPopupMenu();
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popup_menu->BuildMenu(window_,false);
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SVMenuNode* bar_menu = BuildMenuBar();
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bar_menu->BuildMenu(window_,true);
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// Set the initial color values to White (could also be done by
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// passing (rgb[0], rgb[1], rgb[2]).
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window_->Pen(ScrollView::WHITE);
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window_->Brush(ScrollView::WHITE);
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// Adds the event handler to the window. This actually ensures that Notify
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// gets called when events occur.
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window_->AddEventHandler(this);
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// Set the window visible (calling this is important to actually render
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// everything. Without this call, the window would also be drawn, but the
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// menu bars would be missing.
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window_->SetVisible(true);
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// Rest this thread until its window is destroyed.
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// Note that a special eventhandling thread was created when constructing
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// the window. Due to this, the application will not deadlock here.
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window_->AwaitEvent(SVET_DESTROY);
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// We now have 3 Threads running:
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// (1) The MessageReceiver thread which fetches messages and distributes them
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// (2) The EventHandler thread which handles all events for window_
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// (3) The main thread which waits on window_ for a DESTROY event (blocked)
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}
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// If a parameter is given, we try to connect to the given server.
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// This enables us to test the remote capabilites of ScrollView.
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int main(int argc, char** argv) {
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const char* server_name;
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if (argc > 1) { server_name = argv[1]; } else { server_name = "localhost"; }
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SVPaint svp(server_name);
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}
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#endif // GRAPHICS_DISABLED
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