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canvas.cpp
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C/C++ Source or Header
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2002-07-07
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/////////////////////////////////////////////////////////////////////////////
// Name: canvas.cpp
// Purpose: Shape canvas class
// Author: Julian Smart
// Modified by:
// Created: 12/07/98
// RCS-ID: $Id: canvas.cpp,v 1.6 2002/07/06 04:14:27 RD Exp $
// Copyright: (c) Julian Smart
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifdef __GNUG__
#pragma implementation "canvas.h"
#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#ifndef WX_PRECOMP
#include <wx/wx.h>
#endif
#include <wx/wxexpr.h>
#ifdef new
#undef new
#endif
#if wxUSE_IOSTREAMH
#include <iostream.h>
#else
#include <iostream>
#endif
#include <ctype.h>
#include <math.h>
#include <stdlib.h>
#include <wx/ogl/basic.h>
#include <wx/ogl/basicp.h>
#include <wx/ogl/canvas.h>
#include <wx/ogl/ogldiag.h>
#include <wx/ogl/misc.h>
#include <wx/ogl/lines.h>
#include <wx/ogl/composit.h>
#define CONTROL_POINT_SIZE 6
// Control point types
// Rectangle and most other shapes
#define CONTROL_POINT_VERTICAL 1
#define CONTROL_POINT_HORIZONTAL 2
#define CONTROL_POINT_DIAGONAL 3
// Line
#define CONTROL_POINT_ENDPOINT_TO 4
#define CONTROL_POINT_ENDPOINT_FROM 5
#define CONTROL_POINT_LINE 6
IMPLEMENT_DYNAMIC_CLASS(wxShapeCanvas, wxScrolledWindow)
BEGIN_EVENT_TABLE(wxShapeCanvas, wxScrolledWindow)
EVT_PAINT(wxShapeCanvas::OnPaint)
EVT_MOUSE_EVENTS(wxShapeCanvas::OnMouseEvent)
END_EVENT_TABLE()
wxChar* wxShapeCanvasNameStr = wxT("shapeCanvas");
// Object canvas
wxShapeCanvas::wxShapeCanvas(wxWindow *parent, wxWindowID id,
const wxPoint& pos,
const wxSize& size,
long style,
const wxString& name):
wxScrolledWindow(parent, id, pos, size, style, name)
{
m_shapeDiagram = NULL;
m_dragState = NoDragging;
m_draggedShape = NULL;
m_oldDragX = 0;
m_oldDragY = 0;
m_firstDragX = 0;
m_firstDragY = 0;
m_checkTolerance = TRUE;
}
wxShapeCanvas::~wxShapeCanvas()
{
}
void wxShapeCanvas::OnPaint(wxPaintEvent& event)
{
wxPaintDC dc(this);
PrepareDC(dc);
dc.SetBackground(wxBrush(GetBackgroundColour(), wxSOLID));
dc.Clear();
if (GetDiagram())
GetDiagram()->Redraw(dc);
}
void wxShapeCanvas::OnMouseEvent(wxMouseEvent& event)
{
wxClientDC dc(this);
PrepareDC(dc);
wxPoint logPos(event.GetLogicalPosition(dc));
double x, y;
x = (double) logPos.x;
y = (double) logPos.y;
int keys = 0;
if (event.ShiftDown())
keys = keys | KEY_SHIFT;
if (event.ControlDown())
keys = keys | KEY_CTRL;
bool dragging = event.Dragging();
// Check if we're within the tolerance for mouse movements.
// If we're very close to the position we started dragging
// from, this may not be an intentional drag at all.
if (dragging)
{
int dx = abs(dc.LogicalToDeviceX((long) (x - m_firstDragX)));
int dy = abs(dc.LogicalToDeviceY((long) (y - m_firstDragY)));
if (m_checkTolerance && (dx <= GetDiagram()->GetMouseTolerance()) && (dy <= GetDiagram()->GetMouseTolerance()))
{
return;
}
else
// If we've ignored the tolerance once, then ALWAYS ignore
// tolerance in this drag, even if we come back within
// the tolerance range.
m_checkTolerance = FALSE;
}
// Dragging - note that the effect of dragging is left entirely up
// to the object, so no movement is done unless explicitly done by
// object.
if (dragging && m_draggedShape && m_dragState == StartDraggingLeft)
{
m_dragState = ContinueDraggingLeft;
// If the object isn't m_draggable, transfer message to canvas
if (m_draggedShape->Draggable())
m_draggedShape->GetEventHandler()->OnBeginDragLeft((double)x, (double)y, keys, m_draggedAttachment);
else
{
m_draggedShape = NULL;
OnBeginDragLeft((double)x, (double)y, keys);
}
m_oldDragX = x; m_oldDragY = y;
}
else if (dragging && m_draggedShape && m_dragState == ContinueDraggingLeft)
{
// Continue dragging
m_draggedShape->GetEventHandler()->OnDragLeft(FALSE, m_oldDragX, m_oldDragY, keys, m_draggedAttachment);
m_draggedShape->GetEventHandler()->OnDragLeft(TRUE, (double)x, (double)y, keys, m_draggedAttachment);
m_oldDragX = x; m_oldDragY = y;
}
else if (event.LeftUp() && m_draggedShape && m_dragState == ContinueDraggingLeft)
{
m_dragState = NoDragging;
m_checkTolerance = TRUE;
m_draggedShape->GetEventHandler()->OnDragLeft(FALSE, m_oldDragX, m_oldDragY, keys, m_draggedAttachment);
m_draggedShape->GetEventHandler()->OnEndDragLeft((double)x, (double)y, keys, m_draggedAttachment);
m_draggedShape = NULL;
}
else if (dragging && m_draggedShape && m_dragState == StartDraggingRight)
{
m_dragState = ContinueDraggingRight;
if (m_draggedShape->Draggable())
m_draggedShape->GetEventHandler()->OnBeginDragRight((double)x, (double)y, keys, m_draggedAttachment);
else
{
m_draggedShape = NULL;
OnBeginDragRight((double)x, (double)y, keys);
}
m_oldDragX = x; m_oldDragY = y;
}
else if (dragging && m_draggedShape && m_dragState == ContinueDraggingRight)
{
// Continue dragging
m_draggedShape->GetEventHandler()->OnDragRight(FALSE, m_oldDragX, m_oldDragY, keys, m_draggedAttachment);
m_draggedShape->GetEventHandler()->OnDragRight(TRUE, (double)x, (double)y, keys, m_draggedAttachment);
m_oldDragX = x; m_oldDragY = y;
}
else if (event.RightUp() && m_draggedShape && m_dragState == ContinueDraggingRight)
{
m_dragState = NoDragging;
m_checkTolerance = TRUE;
m_draggedShape->GetEventHandler()->OnDragRight(FALSE, m_oldDragX, m_oldDragY, keys, m_draggedAttachment);
m_draggedShape->GetEventHandler()->OnEndDragRight((double)x, (double)y, keys, m_draggedAttachment);
m_draggedShape = NULL;
}
// All following events sent to canvas, not object
else if (dragging && !m_draggedShape && m_dragState == StartDraggingLeft)
{
m_dragState = ContinueDraggingLeft;
OnBeginDragLeft((double)x, (double)y, keys);
m_oldDragX = x; m_oldDragY = y;
}
else if (dragging && !m_draggedShape && m_dragState == ContinueDraggingLeft)
{
// Continue dragging
OnDragLeft(FALSE, m_oldDragX, m_oldDragY, keys);
OnDragLeft(TRUE, (double)x, (double)y, keys);
m_oldDragX = x; m_oldDragY = y;
}
else if (event.LeftUp() && !m_draggedShape && m_dragState == ContinueDraggingLeft)
{
m_dragState = NoDragging;
m_checkTolerance = TRUE;
OnDragLeft(FALSE, m_oldDragX, m_oldDragY, keys);
OnEndDragLeft((double)x, (double)y, keys);
m_draggedShape = NULL;
}
else if (dragging && !m_draggedShape && m_dragState == StartDraggingRight)
{
m_dragState = ContinueDraggingRight;
OnBeginDragRight((double)x, (double)y, keys);
m_oldDragX = x; m_oldDragY = y;
}
else if (dragging && !m_draggedShape && m_dragState == ContinueDraggingRight)
{
// Continue dragging
OnDragRight(FALSE, m_oldDragX, m_oldDragY, keys);
OnDragRight(TRUE, (double)x, (double)y, keys);
m_oldDragX = x; m_oldDragY = y;
}
else if (event.RightUp() && !m_draggedShape && m_dragState == ContinueDraggingRight)
{
m_dragState = NoDragging;
m_checkTolerance = TRUE;
OnDragRight(FALSE, m_oldDragX, m_oldDragY, keys);
OnEndDragRight((double)x, (double)y, keys);
m_draggedShape = NULL;
}
// Non-dragging events
else if (event.IsButton())
{
m_checkTolerance = TRUE;
// Find the nearest object
int attachment = 0;
wxShape *nearest_object = FindShape(x, y, &attachment);
if (nearest_object) // Object event
{
if (event.LeftDown())
{
m_draggedShape = nearest_object;
m_draggedAttachment = attachment;
m_dragState = StartDraggingLeft;
m_firstDragX = x;
m_firstDragY = y;
}
else if (event.LeftUp())
{
// N.B. Only register a click if the same object was
// identified for down *and* up.
if (nearest_object == m_draggedShape)
nearest_object->GetEventHandler()->OnLeftClick((double)x, (double)y, keys, attachment);
m_draggedShape = NULL;
m_dragState = NoDragging;
}
else if (event.LeftDClick())
{
nearest_object->GetEventHandler()->OnLeftDoubleClick((double)x, (double)y, keys, attachment);
m_draggedShape = NULL;
m_dragState = NoDragging;
}
else if (event.RightDown())
{
m_draggedShape = nearest_object;
m_draggedAttachment = attachment;
m_dragState = StartDraggingRight;
m_firstDragX = x;
m_firstDragY = y;
}
else if (event.RightUp())
{
if (nearest_object == m_draggedShape)
nearest_object->GetEventHandler()->OnRightClick((double)x, (double)y, keys, attachment);
m_draggedShape = NULL;
m_dragState = NoDragging;
}
}
else // Canvas event (no nearest object)
{
if (event.LeftDown())
{
m_draggedShape = NULL;
m_dragState = StartDraggingLeft;
m_firstDragX = x;
m_firstDragY = y;
}
else if (event.LeftUp())
{
OnLeftClick((double)x, (double)y, keys);
m_draggedShape = NULL;
m_dragState = NoDragging;
}
else if (event.RightDown())
{
m_draggedShape = NULL;
m_dragState = StartDraggingRight;
m_firstDragX = x;
m_firstDragY = y;
}
else if (event.RightUp())
{
OnRightClick((double)x, (double)y, keys);
m_draggedShape = NULL;
m_dragState = NoDragging;
}
}
}
}
/*
* Try to find a sensitive object, working up the hierarchy of composites.
*
*/
wxShape *wxShapeCanvas::FindFirstSensitiveShape(double x, double y, int *new_attachment, int op)
{
wxShape *image = FindShape(x, y, new_attachment);
if (!image) return NULL;
wxShape *actualImage = FindFirstSensitiveShape1(image, op);
if (actualImage)
{
double dist;
// Find actual attachment
actualImage->HitTest(x, y, new_attachment, &dist);
}
return actualImage;
}
wxShape *wxShapeCanvas::FindFirstSensitiveShape1(wxShape *image, int op)
{
if (image->GetSensitivityFilter() & op)
return image;
if (image->GetParent())
return FindFirstSensitiveShape1(image->GetParent(), op);
return NULL;
}
// Helper function: TRUE if 'contains' wholly contains 'contained'.
static bool WhollyContains(wxShape *contains, wxShape *contained)
{
double xp1, yp1, xp2, yp2;
double w1, h1, w2, h2;
double left1, top1, right1, bottom1, left2, top2, right2, bottom2;
xp1 = contains->GetX(); yp1 = contains->GetY(); xp2 = contained->GetX(); yp2 = contained->GetY();
contains->GetBoundingBoxMax(&w1, &h1);
contained->GetBoundingBoxMax(&w2, &h2);
left1 = (double)(xp1 - (w1 / 2.0));
top1 = (double)(yp1 - (h1 / 2.0));
right1 = (double)(xp1 + (w1 / 2.0));
bottom1 = (double)(yp1 + (h1 / 2.0));
left2 = (double)(xp2 - (w2 / 2.0));
top2 = (double)(yp2 - (h2 / 2.0));
right2 = (double)(xp2 + (w2 / 2.0));
bottom2 = (double)(yp2 + (h2 / 2.0));
return ((left1 <= left2) && (top1 <= top2) && (right1 >= right2) && (bottom1 >= bottom2));
}
wxShape *wxShapeCanvas::FindShape(double x, double y, int *attachment, wxClassInfo *info, wxShape *notObject)
{
double nearest = 100000.0;
int nearest_attachment = 0;
wxShape *nearest_object = NULL;
// Go backward through the object list, since we want:
// (a) to have the control points drawn LAST to overlay
// the other objects
// (b) to find the control points FIRST if they exist
wxNode *current = GetDiagram()->GetShapeList()->Last();
while (current)
{
wxShape *object = (wxShape *)current->Data();
double dist;
int temp_attachment;
// First pass for lines, which might be inside a container, so we
// want lines to take priority over containers. This first loop
// could fail if we clickout side a line, so then we'll
// try other shapes.
if (object->IsShown() &&
object->IsKindOf(CLASSINFO(wxLineShape)) &&
object->HitTest(x, y, &temp_attachment, &dist) &&
((info == NULL) || object->IsKindOf(info)) &&
(!notObject || !notObject->HasDescendant(object)))
{
// A line is trickier to spot than a normal object.
// For a line, since it's the diagonal of the box
// we use for the hit test, we may have several
// lines in the box and therefore we need to be able
// to specify the nearest point to the centre of the line
// as our hit criterion, to give the user some room for
// manouevre.
if (dist < nearest)
{
nearest = dist;
nearest_object = object;
nearest_attachment = temp_attachment;
}
}
if (current)
current = current->Previous();
}
current = GetDiagram()->GetShapeList()->Last();
while (current)
{
wxShape *object = (wxShape *)current->Data();
double dist;
int temp_attachment;
// On second pass, only ever consider non-composites or divisions. If children want to pass
// up control to the composite, that's up to them.
if (object->IsShown() && (object->IsKindOf(CLASSINFO(wxDivisionShape)) || !object->IsKindOf(CLASSINFO(wxCompositeShape)))
&& object->HitTest(x, y, &temp_attachment, &dist) && ((info == NULL) || object->IsKindOf(info)) &&
(!notObject || !notObject->HasDescendant(object)))
{
if (!object->IsKindOf(CLASSINFO(wxLineShape)))
{
// If we've hit a container, and we have already found a line in the
// first pass, then ignore the container in case the line is in the container.
// Check for division in case line straddles divisions (i.e. is not wholly contained).
if (!nearest_object || !(object->IsKindOf(CLASSINFO(wxDivisionShape)) || WhollyContains(object, nearest_object)))
{
nearest = dist;
nearest_object = object;
nearest_attachment = temp_attachment;
current = NULL;
}
}
}
if (current)
current = current->Previous();
}
*attachment = nearest_attachment;
return nearest_object;
}
/*
* Higher-level events called by OnEvent
*
*/
void wxShapeCanvas::OnLeftClick(double x, double y, int keys)
{
}
void wxShapeCanvas::OnRightClick(double x, double y, int keys)
{
}
void wxShapeCanvas::OnDragLeft(bool draw, double x, double y, int keys)
{
}
void wxShapeCanvas::OnBeginDragLeft(double x, double y, int keys)
{
}
void wxShapeCanvas::OnEndDragLeft(double x, double y, int keys)
{
}
void wxShapeCanvas::OnDragRight(bool draw, double x, double y, int keys)
{
}
void wxShapeCanvas::OnBeginDragRight(double x, double y, int keys)
{
}
void wxShapeCanvas::OnEndDragRight(double x, double y, int keys)
{
}
void wxShapeCanvas::AddShape(wxShape *object, wxShape *addAfter)
{ GetDiagram()->AddShape(object, addAfter); }
void wxShapeCanvas::InsertShape(wxShape *object)
{ GetDiagram()->InsertShape(object); }
void wxShapeCanvas::RemoveShape(wxShape *object)
{ GetDiagram()->RemoveShape(object); }
bool wxShapeCanvas::GetQuickEditMode()
{ return GetDiagram()->GetQuickEditMode(); }
void wxShapeCanvas::Redraw(wxDC& dc)
{ GetDiagram()->Redraw(dc); }
void wxShapeCanvas::Snap(double *x, double *y)
{ GetDiagram()->Snap(x, y); }