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Added automatic connection of drawn points

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@5932 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Guillermo Rodriguez Garcia 2000-02-09 20:22:57 +00:00
parent 633d67bb49
commit 7989fb3707
2 changed files with 71 additions and 15 deletions
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85
demos/life/life.cpp
View File

@ -625,24 +625,79 @@ void LifeCanvas::OnMouse(wxMouseEvent& event)
if (!event.LeftIsDown())
{
m_status = MOUSE_NOACTION;
return;
}
else
// button just pressed?
if (m_status == MOUSE_NOACTION)
{
bool alive = m_life->IsAlive(i, j);
// if just pressed, update status
if (m_status == MOUSE_NOACTION)
m_status = (alive? MOUSE_ERASING : MOUSE_DRAWING);
// toggle cell and refresh if needed
if (((m_status == MOUSE_ERASING) && alive) ||
((m_status == MOUSE_DRAWING) && !alive))
{
m_life->SetCell(i, j, !alive);
DrawCell(i, j, !alive);
GET_FRAME()->UpdateInfoText();
}
// yes, update status and toggle this cell
m_status = (m_life->IsAlive(i, j)? MOUSE_ERASING : MOUSE_DRAWING);
m_mi = i;
m_mj = j;
m_life->SetCell(i, j, m_status == MOUSE_DRAWING);
DrawCell(i, j, m_status == MOUSE_DRAWING);
}
else if ((m_mi != i) || (m_mj != j))
{
// draw a line of cells using Bresenham's algorithm
wxInt32 d, ii, jj, di, ai, si, dj, aj, sj;
di = i - m_mi;
ai = abs(di) << 1;
si = (di < 0)? -1 : 1;
dj = j - m_mj;
aj = abs(dj) << 1;
sj = (dj < 0)? -1 : 1;
ii = m_mi;
jj = m_mj;
if (ai > aj)
{
// iterate over i
d = aj - (ai >> 1);
while (ii != i)
{
m_life->SetCell(ii, jj, m_status == MOUSE_DRAWING);
DrawCell(ii, jj, m_status == MOUSE_DRAWING);
if (d >= 0)
{
jj += sj;
d -= ai;
}
ii += si;
d += aj;
}
}
else
{
// iterate over j
d = ai - (aj >> 1);
while (jj != j)
{
m_life->SetCell(ii, jj, m_status == MOUSE_DRAWING);
DrawCell(ii, jj, m_status == MOUSE_DRAWING);
if (d >= 0)
{
ii += si;
d -= aj;
}
jj += sj;
d += ai;
}
}
// last cell
m_life->SetCell(ii, jj, m_status == MOUSE_DRAWING);
DrawCell(ii, jj, m_status == MOUSE_DRAWING);
m_mi = ii;
m_mj = jj;
}
GET_FRAME()->UpdateInfoText();
}
void LifeCanvas::OnSize(wxSizeEvent& event)

1
demos/life/life.h
View File

@ -91,6 +91,7 @@ private:
wxInt32 m_viewportH; // number of visible cells (h)
int m_thumbX; // horiz. scrollbar thumb position
int m_thumbY; // vert. scrollbar thumb position
wxInt32 m_mi, m_mj; // last mouse position
};
// --------------------------------------------------------------------------