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Optimized drawing code in OnMouse() for freehand drawing.

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6102 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Guillermo Rodriguez Garcia
2000-02-17 03:02:14 +00:00
parent 102f951d7f
commit 5e9ff6adaa
1 changed files with 16 additions and 8 deletions
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24
demos/life/life.cpp
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@@ -543,12 +543,10 @@ void LifeCanvas::DrawChanged()
if (m_cellsize == 1)
{
// drawn using DrawPoint
dc.SetPen(*wxBLACK_PEN);
}
else
{
// drawn using DrawRectangle
dc.SetPen(*wxTRANSPARENT_PEN);
dc.SetBrush(*wxBLACK_BRUSH);
}
@@ -666,6 +664,14 @@ void LifeCanvas::OnMouse(wxMouseEvent& event)
}
else if ((m_mi != i) || (m_mj != j))
{
bool alive = (m_status == MOUSE_DRAWING);
// prepare DC and pen + brush to optimize drawing
wxClientDC dc(this);
dc.SetPen(alive? *wxBLACK_PEN : *wxWHITE_PEN);
dc.SetBrush(alive? *wxBLACK_BRUSH : *wxWHITE_BRUSH);
dc.BeginDrawing();
// draw a line of cells using Bresenham's algorithm
wxInt32 d, ii, jj, di, ai, si, dj, aj, sj;
di = i - m_mi;
@@ -685,8 +691,8 @@ void LifeCanvas::OnMouse(wxMouseEvent& event)
while (ii != i)
{
m_life->SetCell(ii, jj, m_status == MOUSE_DRAWING);
DrawCell(ii, jj, m_status == MOUSE_DRAWING);
m_life->SetCell(ii, jj, alive);
DrawCell(ii, jj, dc);
if (d >= 0)
{
jj += sj;
@@ -703,8 +709,8 @@ void LifeCanvas::OnMouse(wxMouseEvent& event)
while (jj != j)
{
m_life->SetCell(ii, jj, m_status == MOUSE_DRAWING);
DrawCell(ii, jj, m_status == MOUSE_DRAWING);
m_life->SetCell(ii, jj, alive);
DrawCell(ii, jj, dc);
if (d >= 0)
{
ii += si;
@@ -716,10 +722,12 @@ void LifeCanvas::OnMouse(wxMouseEvent& event)
}
// last cell
m_life->SetCell(ii, jj, m_status == MOUSE_DRAWING);
DrawCell(ii, jj, m_status == MOUSE_DRAWING);
m_life->SetCell(ii, jj, alive);
DrawCell(ii, jj, dc);
m_mi = ii;
m_mj = jj;
dc.EndDrawing();
}
GET_FRAME()->UpdateInfoText();