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Fixed RoundLine implementation for Solid=1, AntiAlias=1, and LineStart > 0. AntiAliasing now works correctly on both edges of the arc.

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Brian Todoroff
2009-03-12 19:32:43 +00:00
parent 464414f2be
commit a035c76101
1 changed files with 19 additions and 8 deletions
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27
Library/MeterRoundLine.cpp
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@@ -1,5 +1,5 @@
/* /*
Copyright (C) 2002 Kimmo Pekkola Copyright (C) 2009 Kimmo Pekkola, Brian Todoroff
This program is free software; you can redistribute it and/or This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License modify it under the terms of the GNU General Public License
@@ -137,14 +137,25 @@ bool CMeterRoundLine::Draw()
if (m_LineStart > 0.0) if (m_LineStart > 0.0)
{ {
// Create clipping region // Create clipping region
GraphicsPath path; //GraphicsPath path;
path.AddEllipse(REAL(cx - m_LineStart), REAL(cy - m_LineStart), REAL(m_LineStart * 2), REAL(m_LineStart * 2)); //path.AddEllipse(REAL(cx - m_LineStart), REAL(cy - m_LineStart), REAL(m_LineStart * 2), REAL(m_LineStart * 2));
graphics.SetClip(&path, CombineModeExclude); //graphics.SetClip(&path, CombineModeExclude);
}
// Calculate the center of for the line //Draw an arc with a pen m_Width wide
SolidBrush solidBrush(m_LineColor); REAL lineWidth = (REAL)m_LineLength - (REAL)m_LineStart;
graphics.FillPie(&solidBrush, (REAL)(cx - m_LineLength), (REAL)(cy - m_LineLength), (REAL)(m_LineLength * 2.0), (REAL)(m_LineLength * 2.0), (REAL)(m_StartAngle * 180.0 / PI), (REAL)(m_RotationAngle * m_Value * 180.0 / PI)); Pen pen(m_LineColor, lineWidth);
// Calculate the end point of the line
double angle = m_RotationAngle * m_Value + m_StartAngle;
REAL adjLineLength = m_LineLength - (lineWidth/2);
graphics.DrawArc(&pen,(REAL)(cx - adjLineLength), (REAL)(cy - adjLineLength), (REAL)(adjLineLength * 2.0), (REAL)(adjLineLength * 2.0), (REAL)(m_StartAngle * 180.0 / PI), (REAL)(m_RotationAngle * m_Value * 180.0 / PI));
}
else
{
// Calculate the center of for the line
SolidBrush solidBrush(m_LineColor);
graphics.FillPie(&solidBrush, (REAL)(cx - m_LineLength), (REAL)(cy - m_LineLength), (REAL)(m_LineLength * 2.0), (REAL)(m_LineLength * 2.0), (REAL)(m_StartAngle * 180.0 / PI), (REAL)(m_RotationAngle * m_Value * 180.0 / PI));
}
} }
else else
{ {