private void AddBitmapRequestToList(BasicRectangle boundsBitmap, BasicRectangle boundsWaveForm, float zoom, WaveFormDisplayType displayType)
{
// Make sure we don't slow down GetTile() by creating a task and running LINQ queries on another thread
Task.Factory.StartNew(() =>
{
var request = new WaveFormBitmapRequest()
{
DisplayType = displayType,
BoundsBitmap = boundsBitmap,
BoundsWaveForm = boundsWaveForm,
Zoom = zoom
};
// Check if a tile already exists
WaveFormTile existingTile = null;
lock (_lockerTiles)
{
existingTile = _tiles.FirstOrDefault(obj => obj.ContentOffset.X == boundsBitmap.X && obj.Zoom == zoom);
}
lock (_lockerRequests)
{
// Check if bitmap has already been requested in queue
var existingRequest = _requests.FirstOrDefault(obj =>
obj.BoundsBitmap.Equals(request.BoundsBitmap) &&
obj.BoundsWaveForm.Equals(request.BoundsWaveForm) &&
obj.Zoom == request.Zoom);
// Request a new bitmap only if necessary
if (existingRequest == null && existingTile == null)
{
//Console.WriteLine("WaveFormCacheService - Adding bitmap request to queue - zoom: {0} boundsBitmap: {1} boundsWaveForm: {2}", zoom, boundsBitmap, boundsWaveForm);
_requests.Add(request);
// Remove the oldest request from the list if we hit the maximum
if(_requests.Count > MaxNumberOfRequests)
_requests.RemoveAt(0);
//Console.WriteLine("............. PULSING");
Monitor.Pulse(_lockerRequests);
}
}
});
}
public List<WaveFormTile> GetTiles(WaveFormBitmapRequest request)
{
if (request.Zoom != _lastZoom && request.Zoom > 1)
{
lock (_lockerCache)
{
// Bug: when requesting the smaller tiles, the zoom changes
//Console.WriteLine("WaveFormCacheService - Zoom has changed - lastZoom: {0} zoom: {1}", _lastZoom, request.Zoom);
_lastZoom = request.Zoom;
_tileCacheForZoom.Clear();
}
}
//float coveredAreaX = 0;
float zoomThreshold = (float)Math.Floor(request.Zoom);
var boundsWaveFormAdjusted = new BasicRectangle(0, 0, request.BoundsWaveForm.Width * zoomThreshold, request.BoundsWaveForm.Height);
var tiles = new List<WaveFormTile>();
//List<WaveFormTile> previouslyAvailableTiles = new List<WaveFormTile>();
for (int a = request.StartTile; a < request.EndTile; a++)
{
WaveFormTile tile = null;
float tileX = a * request.TileSize;
// Add lock for cache
WaveFormTile cachedTile = null;
lock (_lockerCache)
{
if(request.IsScrollBar)
cachedTile = _tileCacheForScrollBar.FirstOrDefault(x => x.ContentOffset.X == tileX);
else
cachedTile = _tileCacheForZoom.FirstOrDefault(x => x.ContentOffset.X == tileX);
}
if (cachedTile != null)
{
//Console.WriteLine(">>>>>>>>>> Taking cached tile!");
tile = cachedTile;
}
else
{
// This is a hot line, and needs to be avoided as much as possible.
// the problem is that tiles vary in time in quality.
// maybe as a first, when a tile at the right zoom is available, cache it locally so it isn't necessary to call the algo again.
var availableTiles = GetAvailableTilesForPosition(tileX, request.Zoom);
var boundsBitmap = new BasicRectangle(tileX, 0, TileSize, request.BoundsWaveForm.Height);
if (availableTiles != null && availableTiles.Count > 0)
{
// TEMP: Add every tile for zoom == 100% (TESTING) -- This fixes the empty areas and proves the coveredAreaX technique doesn't work.
var tileLowRes = availableTiles.FirstOrDefault(x => x.Zoom == 1);
if (tileLowRes != null && !tiles.Contains(tileLowRes))
tiles.Add(tileLowRes);
// Get the tile with the zoom that is the closest to the current zoom threshold
tile = GetOptimalTileAtZoom(availableTiles, zoomThreshold);
// If we could not find a tile at this zoom level, we need to generate one
if (tile.Zoom != zoomThreshold)
{
//Console.WriteLine("WaveFormCacheService - Requesting a new bitmap (zoom doesn't match) - zoomThreshold: {0} tile.Zoom: {1} boundsBitmap: {2} boundsWaveForm: {3}", zoomThreshold, tile.Zoom, boundsBitmap, request.BoundsWaveForm);
AddBitmapRequestToList(boundsBitmap, boundsWaveFormAdjusted, zoomThreshold, request.DisplayType);
}
else
{
lock (_lockerCache)
{
_tileCacheForZoom.Add(tile);
}
}
}
else
{
// We need to request a new bitmap at this zoom threshold because there are no bitmaps available (usually zoom @ 100%)
//Console.WriteLine("WaveFormCacheService - Requesting a new bitmap - zoom: {0} zoomThreshold: {1} boundsWaveForm: {2}", zoomThreshold, boundsBitmap, request.BoundsWaveForm);
AddBitmapRequestToList(boundsBitmap, boundsWaveFormAdjusted, zoomThreshold, request.DisplayType);
}
}
//Console.WriteLine("WaveFormCacheService - GetTiles - tile {0} x: {1} Zoom: {2} // tileFound: {3} tile.X: {4} tile.Zoom: {5}", a, tileX, zoom, tile == null, tile != null ? tile.ContentOffset.X : -1, tile != null ? tile.Zoom : -1);
if (tile != null)
{
// Calculate the new covered area (adjusted with the zoom delta)
//float currentTileDeltaZoom = request.Zoom/tile.Zoom;
//float currentTileX = tile.ContentOffset.X*currentTileDeltaZoom;
//float currentTileWidth = request.TileSize*currentTileDeltaZoom;
//// Check if the new tile leaves an empty area behind
//if (coveredAreaX < tile.ContentOffset.X)
//{
// //Console.WriteLine("[...] WaveFormCacheService - GetTiles - An empty area has been found - coveredAreaX: {0} tile.ContentOffset.X: {1}", coveredAreaX, currentTileX);
// //var tilesToFillEmptyArea = GetAvailableTilesToFillBounds(tileX, zoom, new BasicRectangle(coveredAreaX, 0, tile.ContentOffset.X - coveredAreaX, boundsWaveForm.Height));
// var tilesToFillEmptyArea = GetAvailableTilesToFillBounds(zoom, new BasicRectangle(coveredAreaX, 0, tile.ContentOffset.X - coveredAreaX, boundsWaveForm.Height));
// //Console.WriteLine("[...] $$$$$$$$$$$$ WaveFormCacheService - GetTiles - tilesToFillEmptyArea.Count: {0}", tilesToFillEmptyArea.Count);
// //foreach (var daTile in tilesToFillEmptyArea)
// // Console.WriteLine(" .....>>>>>> tile.ContentOffset.X: {0} tile.Zoom: {1}", daTile.ContentOffset.X, daTile.Zoom);
// // Go through previously available tiles to find a tile to cover the empty area.
// // This should return at least one tile (there should always be one around at zoom=100% except for the initial loading)
// WaveFormTile tileToCoverEmptyArea = null;
// //foreach (var previouslyAvailableTile in previouslyAvailableTiles)
// //{
// // float previousTileDeltaZoom = zoom/previouslyAvailableTile.Zoom;
// // float previousTileX = previouslyAvailableTile.ContentOffset.X * previousTileDeltaZoom;
// // float previousTileWidth = tileSize * previousTileDeltaZoom;
// // if (previousTileX < coveredAreaX &&
// // previousTileX + previousTileWidth >= currentTileX)
// // {
// // tileToCoverEmptyArea = previouslyAvailableTile;
// // Console.WriteLine("[...] !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! WaveFormCacheService - GetTiles - ==> A tile has been found to cover the empty area - tileToCover.ContentOffset.X: {0} tileWidth: {1} tile.Zoom: {2}", previousTileX, previousTileWidth, tileToCoverEmptyArea.Zoom);
// // break;
// // }
// //}
// //tileToCoverEmptyArea = tilesToFillEmptyArea.OrderByDescending(x => x.Zoom).FirstOrDefault();
// tileToCoverEmptyArea = tilesToFillEmptyArea.FirstOrDefault(x => x.Zoom == 1);
// // We found a tile to cover the area. If not, this should be only when refreshing the wave form for the first time @ 100%
// if (tileToCoverEmptyArea != null)
// {
// Console.WriteLine("---> Adding tile to fill empty - tile.X: {0} tile.Zoom: {1} -- {2}", tileToCoverEmptyArea.ContentOffset.X, tileToCoverEmptyArea.Zoom, DateTime.Now);
// tiles.Add(tileToCoverEmptyArea);
// }
// else
// {
// // The problem is that there are sometimes a tile could not be found the previous list... is that really a good source of info?
// // maybe try the previous list and if not, fall back to the 100% zoom.
// // or actually make a linq query similar to the one with adjusted content offset x.
// Console.WriteLine("[!!!] WARNING: WaveFormCacheService - GetTiles - An empty area could not be filled by a tile!");
// }
//}
// Update the covered area position after trying to fill any empty areas left behind
// Note: There are still empty areas, this might not be the best way to make sure areas are all filled...
//coveredAreaX = currentTileX + currentTileWidth;
// Keep the available tiles from the last index so we can search through this list to cover an empty area if needed
//previouslyAvailableTiles = availableTiles;
// Add tile to list of tiles to draw (TO DO: Check for existing tiles with the same zoom + offset
if(!tiles.Contains(tile))
tiles.Add(tile);
}
}
// Order tiles by zoom and then by content offset x; this makes sure that the tiles with the nearest zoom level get drawn on top of farther zoom levels
// maybe replace this linq query by inserting the tiles in the list in the right order (at tiles.Add(tile) just up from here)
// Also use Distinct to prevent drawing the same tile multiple times
// B U G: This might crash if a tile is removed from the list....
var tilesOrdered = tiles.OrderBy(obj => obj.Zoom).ThenBy(obj => obj.ContentOffset.X).ToList();
return tilesOrdered;
}
private void DrawTiles(IGraphicsContext context, int tileSize, float realScrollBarHeight)
{
float deltaZoom = (float) (Zoom/Math.Floor(Zoom));
int startDirtyTile = (int)Math.Floor((ContentOffset.X + context.DirtyRect.X) / ((float)tileSize * deltaZoom));
int numberOfDirtyTilesToDraw = (int)Math.Ceiling(context.DirtyRect.Width / tileSize) + 1;
var request = new WaveFormBitmapRequest()
{
StartTile = startDirtyTile,
EndTile = startDirtyTile + numberOfDirtyTilesToDraw,
TileSize = tileSize,
BoundsWaveForm = Frame,
Zoom = _zoom,
DisplayType = _displayType
};
var tiles = _waveFormCacheService.GetTiles(request);
//Console.WriteLine("WaveFormControl - #### startTile: {0} startTileX: {1} contentOffset.X: {2} contentOffset.X/tileSize: {3} numberOfTilesToFillWidth: {4} firstTileX: {5}", startTile, startTile * tileSize, ContentOffset.X, ContentOffset.X / tileSize, numberOfTilesToFillWidth, (startTile * tileSize) - ContentOffset.X);
foreach (var tile in tiles)
{
float tileDeltaZoom = Zoom / tile.Zoom;
float x = tile.ContentOffset.X * tileDeltaZoom;
float tileWidth = tileSize * tileDeltaZoom;
float tileHeight = (ShowScrollBar && Zoom > 1) ? Frame.Height - realScrollBarHeight : Frame.Height;
//Console.WriteLine("WaveFormControl - Draw - tile - x: {0} tileWidth: {1} deltaZoom: {2}", x, tileWidth, deltaZoom);
//Console.WriteLine("WaveFormControl - Draw - tile - tile.ContentOffset.X: {0} x: {1} tileWidth: {2} tile.Zoom: {3}", tile.ContentOffset.X, x, tileWidth, tile.Zoom);
//context.DrawImage(new BasicRectangle(x - ContentOffset.X, 0, tileWidth, Frame.Height), tile.Image.ImageSize, tile.Image.Image);
context.DrawImage(new BasicRectangle(x - ContentOffset.X, 0, tileWidth, tileHeight), tile.Image.ImageSize, tile.Image.Image);
// Debug overlay
//context.DrawRectangle(new BasicRectangle(x - ContentOffset.X, 0, tileWidth, Frame.Height), new BasicBrush(new BasicColor(0, 0, 255, 50)), _penCursorLine);
//context.DrawText(string.Format("{0:0.0}", tile.Zoom), new BasicPoint(x - ContentOffset.X + 2, 4), _textColor, "Roboto", 11);
}
}
private void DrawScrollBar(IGraphicsContext context, int tileSize, float realScrollBarHeight)
{
if (ShowScrollBar && Zoom > 1)
{
int startTile = 0;
int numberOfTilesToFillWidth = (int)Math.Ceiling(Frame.Width / tileSize);// + 1; // maybe a bug here? when one of the tile is partially drawn, you need another one?
var requestScrollBar = new WaveFormBitmapRequest()
{
StartTile = startTile,
EndTile = numberOfTilesToFillWidth,
TileSize = tileSize,
BoundsWaveForm = new BasicRectangle(0, 0, Frame.Width, ScrollBarHeight), // Frame
Zoom = 1,
IsScrollBar = true,
DisplayType = _displayType
};
// TODO: Cache those tiles, we do not need to request them continually since these tiles are always at 100%
var tilesScrollBar = _waveFormCacheService.GetTiles(requestScrollBar);
foreach (var tile in tilesScrollBar)
{
context.DrawImage(new BasicRectangle(tile.ContentOffset.X, Frame.Height - realScrollBarHeight, tileSize, realScrollBarHeight), tile.Image.ImageSize, tile.Image.Image);
}
// Draw a veil over the area that's not visible. The veil alpha gets stronger as the zoom progresses.
byte startAlpha = 170;
byte maxAlpha = 210;
byte alpha = (byte)Math.Min(maxAlpha, (startAlpha + (60 * (Zoom / 10))));
var colorVisibleArea = new BasicColor(32, 40, 46, alpha);
float visibleAreaWidth = (1 / Zoom) * Frame.Width;
float visibleAreaX = (1 / Zoom) * ContentOffset.X;
var rectLeftArea = new BasicRectangle(0, Frame.Height - realScrollBarHeight, visibleAreaX, realScrollBarHeight);
var rectRightArea = new BasicRectangle(visibleAreaX + visibleAreaWidth, Frame.Height - realScrollBarHeight, Frame.Width - visibleAreaX - visibleAreaWidth, realScrollBarHeight);
//context.DrawRectangle(new BasicRectangle(visibleAreaX, Frame.Height - scrollBarHeight, visibleAreaWidth, scrollBarHeight), new BasicBrush(colorVisibleArea), new BasicPen());
context.DrawRectangle(rectLeftArea, new BasicBrush(colorVisibleArea), new BasicPen());
context.DrawRectangle(rectRightArea, new BasicBrush(colorVisibleArea), new BasicPen());
}
}
/// <summary>
/// Requests a wave form bitmap to be generated. Once the bitmap is generated, the OnGenerateWaveFormBitmapEnded event is fired.
/// </summary>
public void RequestBitmap(WaveFormBitmapRequest request)
{
ThreadPool.QueueUserWorkItem(new WaitCallback(RequestBitmapInternal), request);
}