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#include "RenderArea.h"
#include <iostream>
#include <cstdlib>
#include <cmath>
#include <gtkmm/toolbutton.h>
#include <GL/gl.h>
namespace ZoomEdit {
namespace Gui {
GdkGLConfig *RenderArea::glconfig = NULL;
RenderArea::RenderArea(BaseObjectType *cobject, const Glib::RefPtr<Gnome::Glade::Xml> &xml)
: Gtk::DrawingArea(cobject), zoomLevel(0), scale(100), x(0), y(0) {
if(!glconfig) {
glconfig = gdk_gl_config_new_by_mode((GdkGLConfigMode)(GDK_GL_MODE_RGB | GDK_GL_MODE_DOUBLE));
if(!glconfig) glconfig = gdk_gl_config_new_by_mode(GDK_GL_MODE_RGB); // Hmm, can't find double buffered config
if(!glconfig) {
std::cerr << "*** No appropriate OpenGL-capable visual found." << std::endl;
std::exit(1);
}
}
signal_realize().connect(sigc::mem_fun(this, &RenderArea::onRealize));
signal_configure_event().connect(sigc::mem_fun(this, &RenderArea::onConfigureEvent));
signal_expose_event().connect(sigc::mem_fun(this, &RenderArea::onExposeEvent));
signal_scroll_event().connect(sigc::mem_fun(this, &RenderArea::onScrollEvent));
Gtk::ToolButton *button;
xml->get_widget("ToolButtonZoomIn", button);
if(button)
button->signal_clicked().connect(sigc::bind(sigc::mem_fun(this, &RenderArea::zoom), 2, 0.5f, 0.5f));
xml->get_widget("ToolButtonZoomOut", button);
if(button)
button->signal_clicked().connect(sigc::bind(sigc::mem_fun(this, &RenderArea::zoom), -2, 0.5f, 0.5f));
gtk_widget_set_gl_capability(GTK_WIDGET(cobject), glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE);
}
void RenderArea::onRealize() {
if(!gdkGLBegin())
return;
glClearColor(0, 0, 0, 0);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
glEnable(GL_LINE_SMOOTH);
glEnable(GL_POINT_SMOOTH);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gdkGLEnd();
}
bool RenderArea::onConfigureEvent(GdkEventConfigure *event) {
updateViewport();
return true;
}
bool RenderArea::onExposeEvent(GdkEventExpose *event) {
if(!gdkGLBegin())
return false;
glClear(GL_COLOR_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glScalef(scale, scale, 1);
glTranslatef(-x, -y, 0);
drawGrid();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
gdkSwapBuffers();
gdkGLEnd();
return true;
}
bool RenderArea::onScrollEvent(GdkEventScroll *event) {
switch(event->direction) {
case GDK_SCROLL_UP:
zoom(1, event->x/get_width(), event->y/get_height());
return true;
case GDK_SCROLL_DOWN:
zoom(-1, event->x/get_width(), event->y/get_height());
return true;
default:
return false;
}
}
void RenderArea::zoom(int zoom, float x, float y) {
zoomLevel = std::max(std::min(zoomLevel + zoom, 50), -100);
scale = 100*std::pow(1.1f, zoomLevel);
queue_draw();
}
void RenderArea::updateViewport() {
if(!gdkGLBegin())
return;
glViewport(0, 0, get_width(), get_height());
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if(get_width() != 0 && get_height() != 0)
glScalef(2.0f/get_width(), -2.0f/get_height(), 1);
gdkGLEnd();
queue_draw();
}
void RenderArea::drawGrid() {
float depth = std::log10(scale)-0.75f;
float depth2 = std::floor(depth);
float step = std::pow(0.1f, depth2);
float f;
int i;
float x1 = x-get_width()/(2*scale), y1 = y-get_height()/(2*scale);
float x2 = x+get_width()/(2*scale), y2 = y+get_height()/(2*scale);
glLineWidth(1.0f);
glBegin(GL_LINES);
for(i = 0; 0.4f*(depth-depth2+i-1) < 0.5f; i++) {
f = std::min(0.4f*(depth-depth2+i), 0.5f);
glColor3f(f, f, f);
for(f = x1 - std::fmod(x1, step) - step; f <= x2; f+=step) {
glVertex2f(f, y1);
glVertex2f(f, y2);
}
for(f = y1 - std::fmod(y1, step) - step; f <= y2; f+=step) {
glVertex2f(x1, f);
glVertex2f(x2, f);
}
step *= 10;
}
glEnd();
}
}
}
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