private void RenderMaqueeWave()
{
int blockWidth = foregroundLeadingSize + marqueeWidth + foregroundTrailingSize;
float t = (((float)(value - minimum)) / ((float)(maximum - minimum))) * (float)(2.0 * Math.PI);
int travelDistance = (this.Width - blockWidth) / 2;
int position = ((this.Width - blockWidth) / 2) + (int)(Math.Sin(t) * (double)travelDistance);
CustomProgressBar.DrawImage(
offscreen,
foregroundImage,
new Rectangle(position, 0, foregroundLeadingSize, this.Height),
new Rectangle(0, 0, foregroundLeadingSize, foregroundImage.Height));
CustomProgressBar.DrawImage(
offscreen,
foregroundImage,
new Rectangle(position + foregroundLeadingSize + marqueeWidth, 0, foregroundTrailingSize, this.Height),
new Rectangle(foregroundImage.Width - foregroundTrailingSize, 0, foregroundTrailingSize, foregroundImage.Height));
CustomProgressBar.DrawImage(
offscreen,
foregroundImage,
new Rectangle(position + foregroundLeadingSize, 0, marqueeWidth, this.Height),
new Rectangle(foregroundLeadingSize, 0, foregroundImage.Width - (foregroundLeadingSize + foregroundTrailingSize), foregroundImage.Height + 1));
}
private void RenderMarqueeTileWrap()
{
Region clipRegion = offscreen.Clip;
int tileLeft = 0;
int blockWidth = foregroundImage.Width - (foregroundLeadingSize + foregroundTrailingSize);
int distance = (int)(((float)this.Width + blockWidth) * ((float)(value - minimum)) / ((float)(maximum - minimum)));
// By setting clip we don't have to change the size of either the source rectangle or the destination rectangle,
// the clip will make sure the overflow is cropped away.
offscreen.Clip = new Region(new Rectangle(distance - blockWidth, 0, blockWidth, this.Height));
int step = 0;
while (tileLeft <= this.Width)
{
CustomProgressBar.DrawImage(
offscreen,
foregroundImage,
new Rectangle(blockWidth * step, 0, blockWidth, this.Height),
new Rectangle(foregroundLeadingSize, 0, blockWidth, foregroundImage.Height));
tileLeft += blockWidth;
++step;
}
offscreen.Clip = clipRegion;
}
protected void RenderCacheImages()
{
CustomProgressBar.DisposeToNull(backgroundCacheImage);
CustomProgressBar.DisposeToNull(overlayCacheImage);
backgroundCacheImage = new Bitmap(Width, Height);
using (Graphics backgroundCacheGraphics = Graphics.FromImage(backgroundCacheImage))
{
// Render the background, here we pass the entire width of the progressbar as the distance value because we
// always want the entire background to be drawn.
Render(backgroundCacheGraphics, backgroundImage, backgroundDrawMethod, backgroundLeadingSize, backgroundTrailingSize, this.Width);
}
overlayCacheImage = new Bitmap(Width, Height);
using (Graphics overlayCacheGraphics = Graphics.FromImage(overlayCacheImage))
{
// Make sure that we retain our chroma key value by starting with a fully transparent overlay cache image
#if PocketPC
overlayCacheGraphics.FillRectangle(new SolidBrush(Color.Magenta), ClientRectangle);
#else
overlayCacheGraphics.FillRectangle(new SolidBrush(Color.Transparent), ClientRectangle);
#endif
// Render the overlay, this way we can get neat border on our progress bar (for example)
Render(overlayCacheGraphics, overlayImage, overlayDrawMethod, overlayLeadingSize, overlayTrailingSize, this.Width);
}
}
private void ProgressBar_Resize(object sender, EventArgs e)
{
//
// If the progressbar is resized we dump out current offscreen and set it to null, a new one
// will then be created as the OnPaint method will request this if it is null.
//
CustomProgressBar.DisposeToNull(offscreenImage);
CustomProgressBar.DisposeToNull(offscreen);
DoLayout();
RenderCacheImages();
}
protected override void OnPaint(PaintEventArgs e)
{
//
// An offscreen is a must have so we make sure one is always created if it does not exists,
// a resize of the progressbar sets offscreenImage to null and this will then automatically
// create a new one with the correct dimensions.
//
if (offscreenImage == null)
{
CreateOffscreen();
}
// Render the background first using the cached image
CustomProgressBar.DrawImage(offscreen, backgroundCacheImage, ClientRectangle, ClientRectangle);
switch (barType)
{
case BarType.Progress:
// We only need to render the foreground if the current value is above the minimum
if (value > minimum)
{
// Calculate the amount of pixels (the distance) to draw.
int distance = (int)(((float)this.Width) * ((float)(value - minimum)) / ((float)(maximum - minimum)));
Render(offscreen, foregroundImage, foregroundDrawMethod, foregroundLeadingSize, foregroundTrailingSize, distance);
}
break;
case BarType.Marquee:
// There are a couple of ways to render the marquee foreground so this is delegated to a method
RenderMarqueeForeground();
break;
}
// Render the overlay using the cached image
CustomProgressBar.DrawImage(offscreen, overlayCacheImage, ClientRectangle, ClientRectangle);
// Finally, draw we our offscreen onto the Graphics in the event.
e.Graphics.DrawImage(offscreenImage, 0, 0);
}
protected void Render(Graphics graphics, Image sourceImage, DrawMethod drawMethod, int leadingSize, int trailingSize, int distance)
{
// If we don't have an image to render just bug out, this allows us to call Render without checking sourceImage first.
if (sourceImage == null)
{
return;
}
//
// Draw the first segment of the image as defined by leadingSize, this is always drawn at (0, 0).
//
CustomProgressBar.DrawImage(
graphics,
sourceImage,
new Rectangle(0, 0, leadingSize, this.Height),
new Rectangle(0, 0, leadingSize, sourceImage.Height + 1));
//
// Figure out where the last segment of the image should be drawn, this is always to the right of the first segment
// and then at the given distance minus the width of the last segment.
//
int trailerLeftPosition = Math.Max(leadingSize, distance - trailingSize);
CustomProgressBar.DrawImage(
graphics,
sourceImage,
new Rectangle(trailerLeftPosition, 0, trailingSize, this.Height),
new Rectangle(sourceImage.Width - trailingSize, 0, trailingSize, sourceImage.Height + 1));
//
// We only draw the middle segment if the width of the first and last are less than what we need to display.
//
if (distance > leadingSize + trailingSize)
{
RenderCenterSegment(graphics, sourceImage, drawMethod, leadingSize, trailingSize, distance, trailerLeftPosition);
}
}
private void RenderMarqueeBlockWrap()
{
int blockWidth = foregroundLeadingSize + marqueeWidth + foregroundTrailingSize;
float distance = (((float)(value - minimum)) / ((float)(maximum - minimum))) * (this.Width + blockWidth);
int position = (int)(distance - blockWidth);
CustomProgressBar.DrawImage(
offscreen,
foregroundImage,
new Rectangle(position, 0, foregroundLeadingSize, this.Height),
new Rectangle(0, 0, foregroundLeadingSize, foregroundImage.Height));
CustomProgressBar.DrawImage(
offscreen,
foregroundImage,
new Rectangle(position + foregroundLeadingSize + marqueeWidth, 0, foregroundTrailingSize, this.Height),
new Rectangle(foregroundImage.Width - foregroundTrailingSize, 0, foregroundTrailingSize, foregroundImage.Height));
CustomProgressBar.DrawImage(
offscreen,
foregroundImage,
new Rectangle(position + foregroundLeadingSize, 0, marqueeWidth, this.Height),
new Rectangle(foregroundLeadingSize, 0, foregroundImage.Width - (foregroundLeadingSize + foregroundTrailingSize), foregroundImage.Height + 1));
}
private void RenderCenterSegment(Graphics graphics, Image sourceImage, DrawMethod drawMethod, int leadingSize, int trailingSize, int distance, int trailerLeftPosition)
{
switch (drawMethod)
{
case DrawMethod.Stretch: // This draws the middle segment stretched to fill the area between the first and last segment.
CustomProgressBar.DrawImage(
graphics,
sourceImage,
new Rectangle(leadingSize, 0, distance - (leadingSize + trailingSize), this.Height),
new Rectangle(leadingSize, 0, sourceImage.Width - (leadingSize + trailingSize), sourceImage.Height + 1));
break;
case DrawMethod.Tile: // This draws the middle segment un-stretched as many times as required to fill the area between the first and last segment.
{
Region clipRegion = graphics.Clip;
int tileLeft = leadingSize;
int tileWidth = sourceImage.Width - (leadingSize + trailingSize);
// By setting clip we don't have to change the size of either the source rectangle or the destination rectangle,
// the clip will make sure the overflow is cropped away.
graphics.Clip = new Region(new Rectangle(tileLeft, 0, trailerLeftPosition - tileLeft, this.Height));
while (tileLeft < trailerLeftPosition)
{
CustomProgressBar.DrawImage(
graphics,
sourceImage,
new Rectangle(tileLeft, 0, tileWidth, this.Height),
new Rectangle(leadingSize, 0, tileWidth, sourceImage.Height));
tileLeft += tileWidth;
}
graphics.Clip = clipRegion;
}
break;
}
}