/// <summary>
/// Renders the given scene on the given target for the given view.
/// </summary>
/// <param name="orginalTarget">The target to render to.</param>
/// <param name="primitives">The primitives to render.</param>
/// <param name="view">The current view.</param>
/// <param name="zoomFactor">The current zoom factor.</param>
public bool Render(TTarget orginalTarget, View2D view, float zoomFactor, IEnumerable <Primitive2D> primitives)
{
try {
this.SetRunning(true);
if (view == null)
{
throw new ArgumentNullException("view");
}
if (primitives == null)
{
throw new ArgumentNullException("primitives");
}
if (orginalTarget == null)
{
throw new ArgumentNullException("orginalTarget");
}
// create the target wrapper.
Target2DWrapper <TTarget> target = this.CreateTarget2DWrapper(orginalTarget);
// the on before render event.
this.OnBeforeRender(target, view);
// transform the target coordinates or notify the target of the
// view coordinate system.
this.Transform(target, view);
// render the primitives.
bool complete = this.RenderPrimitives(target, view, zoomFactor, primitives);
// the on after render event.
this.OnAfterRender(target, view);
this.SetRunning(false);
return(complete);
}
catch (Exception ex)
{
OsmSharp.Logging.Log.TraceEvent("Renderer2D", OsmSharp.Logging.TraceEventType.Error,
ex.Message);
this.SetRunning(false);
throw ex;
}
}
/// <summary>
/// Renders the cached scene on the given target for the given view.
/// </summary>
/// <param name="orginalTarget"></param>
/// <param name="view"></param>
public bool RenderCache(TTarget orginalTarget, View2D view)
{
try {
if (_cachedScene != null)
{
this.SetRunning(true);
if (view == null)
{
throw new ArgumentNullException("view");
}
if (orginalTarget == null)
{
throw new ArgumentNullException("orginalTarget");
}
// create the target wrapper.
Target2DWrapper <TTarget> target = this.CreateTarget2DWrapper(orginalTarget);
// transform the target coordinates or notify the target of the
// view coordinate system.
this.Transform(target, view);
// draw the backcolor.
this.DrawBackColor(target, _cachedScene.BackColor);
// render the primitives.
bool complete = this.RenderPrimitives(target, _cachedScene, view);
this.SetRunning(false);
return(complete);
}
return(true);
}
catch (Exception ex) {
OsmSharp.Logging.Log.TraceEvent("Renderer2D", System.Diagnostics.TraceEventType.Error,
ex.Message);
this.SetRunning(false);
throw ex;
}
return(false);
}
/// <summary> /// Draws a polygon on the target. The coordinates given are scene coordinates. /// </summary> /// <param name="target"></param> /// <param name="x">The x coordinate.</param> /// <param name="y">The y coordinate.</param> /// <param name="color">Color.</param> /// <param name="width">Width.</param> /// <param name="fill">If set to <c>true</c> fill.</param> protected abstract void DrawPolygon(Target2DWrapper <TTarget> target, double[] x, double[] y, int color, double width, bool fill);
/// <summary>
/// Draws a line on the target. The coordinates given are scene coordinates.
/// </summary>
/// <param name="target"></param>
/// <param name="x">The x coordinate.</param>
/// <param name="y">The y coordinate.</param>
/// <param name="color">Color.</param>
/// <param name="width">Width.</param>
/// <param name="lineJoin"></param>
/// <param name="dashes"></param>
protected abstract void DrawLine(Target2DWrapper <TTarget> target, double[] x, double[] y, int color, double width,
LineJoin lineJoin, int[] dashes);
/// <summary> /// Draws a point on the target. The coordinates given are scene coordinates. /// </summary> /// <param name="target"></param> /// <param name="x">The x coordinate.</param> /// <param name="y">The y coordinate.</param> /// <param name="color">Color.</param> /// <param name="size">Size.</param> protected abstract void DrawPoint(Target2DWrapper <TTarget> target, double x, double y, int color, double size);
/// <summary> /// Draws the backcolor. /// </summary> /// <param name="target"></param> /// <param name="backColor"></param> protected abstract void DrawBackColor(Target2DWrapper <TTarget> target, int backColor);
/// <summary> /// Transforms the target using the specified view. /// </summary> /// <param name="target"></param> /// <param name="view">View.</param> protected abstract void Transform(Target2DWrapper <TTarget> target, View2D view);
/// <summary>
/// Renders the primities for the given scene.
/// </summary>
/// <param name="target"></param>
/// <param name="scene"></param>
/// <param name="view"></param>
private bool RenderPrimitives(Target2DWrapper <TTarget> target, Scene2D scene, View2D view)
{
try {
// TODO: calculate zoom.
float zoom = (float)view.CalculateZoom(target.Width, target.Height);
// loop over all primitives in the scene.
foreach (Scene2DPrimitive scenePrimitive in scene.Get(view, zoom))
{ // the primitive is visible.
IScene2DPrimitive primitive = scenePrimitive.Primitive;
if (_cancelFlag)
{
return(false); // stop rendering on cancel and return false for an incomplete rendering.
}
if (primitive is Point2D)
{
var point = (Point2D)(primitive);
this.DrawPoint(target, point.X, point.Y, point.Color,
this.FromPixels(target, view, point.Size));
}
else if (primitive is Line2D)
{
var line = (Line2D)(primitive);
this.DrawLine(target, line.X, line.Y, line.Color,
this.FromPixels(target, view, line.Width), line.LineJoin, line.Dashes);
}
else if (primitive is Polygon2D)
{
var polygon = (Polygon2D)(primitive);
this.DrawPolygon(target, polygon.X, polygon.Y, polygon.Color,
this.FromPixels(target, view, polygon.Width), polygon.Fill);
}
else if (primitive is Icon2D)
{
var icon = (Icon2D)(primitive);
this.DrawIcon(target, icon.X, icon.Y, icon.Image);
}
else if (primitive is Image2D)
{
var image = (Image2D)(primitive);
image.Tag = this.DrawImage(target, image.Left, image.Top, image.Right, image.Bottom, image.ImageData,
image.Tag);
}
else if (primitive is ImageTilted2D)
{
var imageTilted = (ImageTilted2D)primitive;
imageTilted.Tag = this.DrawImage(target, imageTilted.Bounds, imageTilted.ImageData, imageTilted.Tag);
}
else if (primitive is Text2D)
{
var text = (Text2D)(primitive);
this.DrawText(target, text.X, text.Y, text.Text, text.Color,
this.FromPixels(target, view, text.Size), text.HaloColor, text.HaloRadius, text.Font);
}
else if (primitive is LineText2D)
{
var lineText = (LineText2D)(primitive);
this.DrawLineText(target, lineText.X, lineText.Y, lineText.Text, lineText.Color,
this.FromPixels(target, view, lineText.Size), lineText.HaloColor, lineText.HaloRadius, lineText.Font);
}
}
return(true);
}
catch (Exception ex) {
OsmSharp.Logging.Log.TraceEvent("Renderer2D", System.Diagnostics.TraceEventType.Error,
ex.Message);
throw ex;
}
return(false);
}
/// <summary> /// Draws the image. /// </summary> /// <returns>The image.</returns> /// <param name="target">Target.</param> /// <param name="bounds">Bounds.</param> /// <param name="imageData">Image data.</param> /// <param name="tag">Tag.</param> protected abstract void DrawImage(Target2DWrapper <TTarget> target, RectangleF2D bounds, INativeImage tag);
/// <summary>
/// Renders the primities for the given scene.
/// </summary>
/// <param name="target"></param>
/// <param name="view"></param>
/// <param name="zoomFactor"></param>
/// <param name="primitives"></param>
private bool RenderPrimitives(Target2DWrapper <TTarget> target, View2D view, float zoomFactor,
IEnumerable <Primitive2D> primitives)
{
try {
// calculate current simplification epsilon.
double epsilon = Scene2D.CalculateSimplificationEpsilon(new WebMercator(), zoomFactor);
// loop over all primitives in the scene.
int simplifiedLines = 0;
int droppedLines = 0;
foreach (Primitive2D primitive in primitives)
{ // the primitive is visible.
if (_cancelFlag)
{
return(false); // stop rendering on cancel and return false for an incomplete rendering.
}
if (primitive == null)
{
continue;
}
double[] x, y;
switch (primitive.Primitive2DType)
{
case Primitive2DType.Line2D:
Line2D line = (Line2D)primitive;
x = line.X;
y = line.Y;
if (x.Length > 4 && line.MaxZoom > zoomFactor * 2 && line.MaxZoom < 512)
{ // try and simplify.
double[][] simplified = OsmSharp.Math.Algorithms.SimplifyCurve.Simplify(new double[][] { x, y },
epsilon);
if (simplified[0].Length < line.X.Length)
{
simplifiedLines++;
x = simplified[0];
y = simplified[1];
}
double distance = epsilon * 2;
if (simplified[0].Length == 2)
{ // check if the simplified version is smaller than epsilon.
distance = System.Math.Sqrt(
System.Math.Pow((simplified[0][0] - simplified[0][1]), 2) +
System.Math.Pow((simplified[1][0] - simplified[1][1]), 2));
}
if (distance < epsilon)
{
droppedLines++;
continue;
}
}
this.DrawLine(target, x, y, line.Color,
this.FromPixels(target, view, line.Width), line.LineJoin, line.Dashes);
break;
case Primitive2DType.Polygon2D:
Polygon2D polygon = (Polygon2D)primitive;
x = polygon.X;
y = polygon.Y;
//if (x.Length > 4 && polygon.MaxZoom > zoomFactor * 2 && polygon.MaxZoom < 512)
//{ // try and simplify.
// double[][] simplified = OsmSharp.Math.Algorithms.SimplifyCurve.Simplify(new double[][] { x, y },
// epsilon);
// if (simplified[0].Length < polygon.X.Length)
// {
// simplifiedLines++;
// x = simplified[0];
// y = simplified[1];
// }
// double distance = epsilon * 2;
// if (simplified[0].Length == 2)
// { // check if the simplified version is smaller than epsilon.
// distance = System.Math.Sqrt(
// System.Math.Pow((simplified[0][0] - simplified[0][1]), 2) +
// System.Math.Pow((simplified[1][0] - simplified[1][1]), 2));
// }
// //if (distance < epsilon)
// //{
// // droppedLines++;
// // continue;
// //}
//}
this.DrawPolygon(target, x, y, polygon.Color,
this.FromPixels(target, view, polygon.Width), polygon.Fill);
break;
case Primitive2DType.LineText2D:
LineText2D lineText = (LineText2D)primitive;
this.DrawLineText(target, lineText.X, lineText.Y, lineText.Text, lineText.Color,
this.FromPixels(target, view, lineText.Size), lineText.HaloColor, lineText.HaloRadius, lineText.Font);
break;
case Primitive2DType.Point2D:
Point2D point = (Point2D)primitive;
this.DrawPoint(target, point.X, point.Y, point.Color,
this.FromPixels(target, view, point.Size));
break;
case Primitive2DType.Icon2D:
Icon2D icon = (Icon2D)primitive;
this.DrawIcon(target, icon.X, icon.Y, icon.Image);
break;
case Primitive2DType.ImageTilted2D:
ImageTilted2D imageTilted = (ImageTilted2D)primitive;
this.DrawImage(target, imageTilted.Bounds, imageTilted.NativeImage);
break;
case Primitive2DType.Image2D:
Image2D image = (Image2D)primitive;
this.DrawImage(target, image.Left, image.Top, image.Right, image.Bottom, image.NativeImage);
break;
case Primitive2DType.Text2D:
Text2D text = (Text2D)primitive;
this.DrawText(target, text.X, text.Y, text.Text, text.Color,
this.FromPixels(target, view, text.Size), text.HaloColor, text.HaloRadius, text.Font);
break;
}
}
return(true);
}
catch (Exception ex) {
OsmSharp.Logging.Log.TraceEvent("Renderer2D", OsmSharp.Logging.TraceEventType.Error,
ex.Message);
throw ex;
}
}
/// <summary> /// Draws an image on the target. /// </summary> /// <param name="target"></param> /// <param name="left"></param> /// <param name="top"></param> /// <param name="right"></param> /// <param name="bottom"></param> /// <param name="imageData"></param> protected abstract object DrawImage(Target2DWrapper <TTarget> target, double left, double top, double right, double bottom, byte[] imageData, object tag);
/// <summary>
/// Builds the current cached scene.
/// </summary>
/// <param name="target"></param>
/// <param name="currentCache"></param>
/// <param name="currentScenes"></param>
/// <param name="view"></param>
protected virtual Scene2D BuildSceneCache(Target2DWrapper <TTarget> target, Scene2D currentCache, List <Scene2D> currentScenes, View2D view)
{
return(null);
}
/// <summary>
/// Called after rendering stops.
/// </summary>
/// <param name="target"></param>
/// <param name="scenes"></param>
/// <param name="view"></param>
protected virtual void OnAfterRender(Target2DWrapper <TTarget> target, List <Scene2D> scenes, View2D view)
{
}
/// <summary> /// Draws the image. /// </summary> /// <returns>The image.</returns> /// <param name="target">Target.</param> /// <param name="bounds">Bounds.</param> /// <param name="imageData">Image data.</param> /// <param name="tag">Tag.</param> protected abstract object DrawImage(Target2DWrapper <TTarget> target, RectangleF2D bounds, byte[] imageData, object tag);
/// <summary>
/// Renders the given scene on the given target for the given view.
/// </summary>
/// <param name="orginalTarget"></param>
/// <param name="scenes">Scene.</param>
/// <param name="view">View.</param>
public bool Render(TTarget orginalTarget, List <Scene2D> scenes, View2D view)
{
try {
if (scenes == null ||
scenes.Count == 0)
{ // there is nothing to render!
return(true);
}
this.SetRunning(true);
if (view == null)
{
throw new ArgumentNullException("view");
}
if (scenes == null)
{
throw new ArgumentNullException("scenes");
}
if (orginalTarget == null)
{
throw new ArgumentNullException("orginalTarget");
}
// create the target wrapper.
Target2DWrapper <TTarget> target = this.CreateTarget2DWrapper(orginalTarget);
// the on before render event.
this.OnBeforeRender(target, scenes, view);
// transform the target coordinates or notify the target of the
// view coordinate system.
this.Transform(target, view);
// draw the backcolor.
this.DrawBackColor(target, scenes[0].BackColor);
bool complete = true;
foreach (var scene in scenes)
{
// render the primitives.
complete = complete &&
this.RenderPrimitives(target, scene, view);
if (!complete)
{
break;
}
}
// the on after render event.
this.OnAfterRender(target, scenes, view);
// build a cached version.
_cachedScene = this.BuildSceneCache(target, _cachedScene, scenes, view);
this.SetRunning(false);
return(complete);
}
catch (Exception ex) {
OsmSharp.Logging.Log.TraceEvent("Renderer2D", System.Diagnostics.TraceEventType.Error,
ex.Message);
this.SetRunning(false);
throw ex;
}
return(false);
}
/// <summary> /// Draws an icon on the target unscaled but centered at the given scene coordinates. /// </summary> /// <param name="target"></param> /// <param name="x"></param> /// <param name="y"></param> /// <param name="imageData"></param> protected abstract void DrawIcon(Target2DWrapper <TTarget> target, double x, double y, byte[] imageData);
/// <summary> /// Draws an image on the target. /// </summary> /// <param name="target"></param> /// <param name="left"></param> /// <param name="top"></param> /// <param name="right"></param> /// <param name="bottom"></param> /// <param name="imageData"></param> protected abstract void DrawImage(Target2DWrapper <TTarget> target, double left, double top, double right, double bottom, INativeImage tag);
/// <summary>
/// Called after rendering is finished or was stopped.
/// </summary>
/// <param name="target"></param>
/// <param name="view"></param>
protected virtual void OnAfterRender(Target2DWrapper <TTarget> target, View2D view)
{
}
/// <summary>
/// Draws text along a given line.
/// </summary>
/// <param name="target"></param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="color"></param>
/// <param name="size"></param>
/// <param name="text"></param>
protected abstract void DrawLineText(Target2DWrapper <TTarget> target, double[] x, double[] y, string text, int color,
double size, int?haloColor, int?haloRadius, string fontName);
/// <summary> /// Returns the size in pixels. /// </summary> /// <returns>The pixels.</returns> /// <param name="target"></param> /// <param name="view">View.</param> /// <param name="sizeInPixels">Size in pixels.</param> protected abstract double FromPixels(Target2DWrapper <TTarget> target, View2D view, double sizeInPixels);
