/// <summary>
/// Redraws only the content over the marker
/// </summary>
private void ClearMarker()
{
Graphics g = CreateGraphics();
// Determine the area that needs to be redrawn
int start_x, start_y, end_x, end_y;
int red = 0;
int green = 0;
int blue = 0;
var hsl_start = new ColorManager.HSL();
var hsl_end = new ColorManager.HSL();
// Find the markers corners
start_x = m_iMarker_X - 5;
start_y = m_iMarker_Y - 5;
end_x = m_iMarker_X + 5;
end_y = m_iMarker_Y + 5;
// Adjust the area if part of it hangs outside the content area
if (start_x < 0)
{
start_x = 0;
}
if (start_y < 0)
{
start_y = 0;
}
if (end_x > Width - 4)
{
end_x = Width - 4;
}
if (end_y > Height - 4)
{
end_y = Height - 4;
}
// Redraw the content based on the current draw style:
// The code get's a little messy from here
switch (m_eDrawStyle)
{
// S=0,S=1,S=2,S=3.....S=100
// L=100
// L=99
// L=98 Drawstyle
// L=97 Hue
// ...
// L=0
case eDrawStyle.Hue:
hsl_start.H = m_hsl.H;
hsl_end.H = m_hsl.H; // Hue is constant
hsl_start.S = (double)start_x / (Width - 4);
// Because we're drawing horizontal lines, s will not change
hsl_end.S = (double)end_x / (Width - 4); // from line to line
for (int i = start_y; i <= end_y; i++) // For each horizontal line:
{
hsl_start.L = 1.0 - (double)i / (Height - 4); // Brightness (L) WILL change for each horizontal
hsl_end.L = hsl_start.L; // line drawn
var br = new LinearGradientBrush(new Rectangle(start_x + 1, i + 2, end_x - start_x + 1, 1),
ColorManager.HSL_to_RGB(hsl_start),
ColorManager.HSL_to_RGB(hsl_end), 0, false);
g.FillRectangle(br, new Rectangle(start_x + 2, i + 2, end_x - start_x + 1, 1));
}
break;
// H=0,H=1,H=2,H=3.....H=360
// L=100
// L=99
// L=98 Drawstyle
// L=97 Saturation
// ...
// L=0
case eDrawStyle.Saturation:
hsl_start.S = m_hsl.S;
hsl_end.S = m_hsl.S; // Saturation is constant
hsl_start.L = 1.0 - (double)start_y / (Height - 4); // Because we're drawing vertical lines, L will
hsl_end.L = 1.0 - (double)end_y / (Height - 4); // not change from line to line
for (int i = start_x; i <= end_x; i++) // For each vertical line:
{
hsl_start.H = (double)i / (Width - 4); // Hue (H) WILL change for each vertical
hsl_end.H = hsl_start.H; // line drawn
var br = new LinearGradientBrush(new Rectangle(i + 2, start_y + 1, 1, end_y - start_y + 2),
ColorManager.HSL_to_RGB(hsl_start),
ColorManager.HSL_to_RGB(hsl_end), 90, false);
g.FillRectangle(br, new Rectangle(i + 2, start_y + 2, 1, end_y - start_y + 1));
}
break;
// H=0,H=1,H=2,H=3.....H=360
// S=100
// S=99
// S=98 Drawstyle
// S=97 Brightness
// ...
// S=0
case eDrawStyle.Brightness:
hsl_start.L = m_hsl.L;
hsl_end.L = m_hsl.L; // Luminance is constant
hsl_start.S = 1.0 - (double)start_y / (Height - 4); // Because we're drawing vertical lines, S will
hsl_end.S = 1.0 - (double)end_y / (Height - 4); // not change from line to line
for (int i = start_x; i <= end_x; i++) // For each vertical line:
{
hsl_start.H = (double)i / (Width - 4); // Hue (H) WILL change for each vertical
hsl_end.H = hsl_start.H; // line drawn
var br = new LinearGradientBrush(new Rectangle(i + 2, start_y + 1, 1, end_y - start_y + 2),
ColorManager.HSL_to_RGB(hsl_start),
ColorManager.HSL_to_RGB(hsl_end), 90, false);
g.FillRectangle(br, new Rectangle(i + 2, start_y + 2, 1, end_y - start_y + 1));
}
break;
// B=0,B=1,B=2,B=3.....B=100
// G=100
// G=99
// G=98 Drawstyle
// G=97 Red
// ...
// G=0
case eDrawStyle.Red:
red = m_rgb.R; // Red is constant
int start_b = Round(255 * (double)start_x / (Width - 4)); // Because we're drawing horizontal lines, B
int end_b = Round(255 * (double)end_x / (Width - 4)); // will not change from line to line
for (int i = start_y; i <= end_y; i++) // For each horizontal line:
{
green = Round(255 - (255 * (double)i / (Height - 4)));
// green WILL change for each horizontal line drawn
var br = new LinearGradientBrush(new Rectangle(start_x + 1, i + 2, end_x - start_x + 1, 1),
Color.FromArgb(red, green, start_b),
Color.FromArgb(red, green, end_b), 0, false);
g.FillRectangle(br, new Rectangle(start_x + 2, i + 2, end_x - start_x + 1, 1));
}
break;
// B=0,B=1,B=2,B=3.....B=100
// R=100
// R=99
// R=98 Drawstyle
// R=97 Green
// ...
// R=0
case eDrawStyle.Green:
green = m_rgb.G;
; // Green is constant
int start_b2 = Round(255 * (double)start_x / (Width - 4)); // Because we're drawing horizontal lines, B
int end_b2 = Round(255 * (double)end_x / (Width - 4)); // will not change from line to line
for (int i = start_y; i <= end_y; i++) // For each horizontal line:
{
red = Round(255 - (255 * (double)i / (Height - 4)));
// red WILL change for each horizontal line drawn
var br = new LinearGradientBrush(new Rectangle(start_x + 1, i + 2, end_x - start_x + 1, 1),
Color.FromArgb(red, green, start_b2),
Color.FromArgb(red, green, end_b2), 0, false);
g.FillRectangle(br, new Rectangle(start_x + 2, i + 2, end_x - start_x + 1, 1));
}
break;
// R=0,R=1,R=2,R=3.....R=100
// G=100
// G=99
// G=98 Drawstyle
// G=97 Blue
// ...
// G=0
case eDrawStyle.Blue:
blue = m_rgb.B;
; // Blue is constant
int start_r = Round(255 * (double)start_x / (Width - 4)); // Because we're drawing horizontal lines, R
int end_r = Round(255 * (double)end_x / (Width - 4)); // will not change from line to line
for (int i = start_y; i <= end_y; i++) // For each horizontal line:
{
green = Round(255 - (255 * (double)i / (Height - 4)));
// green WILL change for each horizontal line drawn
var br = new LinearGradientBrush(new Rectangle(start_x + 1, i + 2, end_x - start_x + 1, 1),
Color.FromArgb(start_r, green, blue),
Color.FromArgb(end_r, green, blue), 0, false);
g.FillRectangle(br, new Rectangle(start_x + 2, i + 2, end_x - start_x + 1, 1));
}
break;
}
}