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00052 using System;
00053 using System.Drawing;
00054
00055 namespace NPlot
00056 {
00057
00065 public class ArrowItem : IDrawable
00066 {
00067
00068 private void Init()
00069 {
00070 FontFamily fontFamily = new FontFamily("Arial");
00071 font_ = new Font(fontFamily, 10, FontStyle.Regular, GraphicsUnit.Pixel);
00072 }
00073
00074
00081 public ArrowItem( PointD position )
00082 {
00083 to_ = position;
00084 Init();
00085 }
00086
00087
00093 public ArrowItem( PointD position, double angle )
00094 {
00095 to_ = position;
00096 angle_ = -angle;
00097 Init();
00098 }
00099
00100
00107 public ArrowItem( PointD position, double angle, string text )
00108 {
00109 to_ = position;
00110 angle_ = -angle;
00111 text_ = text;
00112 Init();
00113 }
00114
00115
00119 public string Text
00120 {
00121 get
00122 {
00123 return text_;
00124 }
00125 set
00126 {
00127 text_ = value;
00128 }
00129 }
00130 private string text_ = "";
00131
00132
00142 public double Angle
00143 {
00144 get
00145 {
00146 return -angle_;
00147 }
00148 set
00149 {
00150 angle_ = -value;
00151 }
00152 }
00153 private double angle_ = -45.0;
00154
00155
00159 public float PhysicalLength
00160 {
00161 get
00162 {
00163 return physicalLength_;
00164 }
00165 set
00166 {
00167 physicalLength_ = value;
00168 }
00169 }
00170 private float physicalLength_ = 40.0f;
00171
00172
00176 public PointD To
00177 {
00178 get
00179 {
00180 return to_;
00181 }
00182 set
00183 {
00184 to_ = value;
00185 }
00186 }
00187 private PointD to_;
00188
00189
00193 public float HeadSize
00194 {
00195 get
00196 {
00197 return headSize_;
00198 }
00199 set
00200 {
00201 headSize_ = value;
00202 }
00203 }
00204 private float headSize_ = 10.0f;
00205
00206
00210 public float HeadAngle
00211 {
00212 get
00213 {
00214 return headAngle_;
00215 }
00216 set
00217 {
00218 headAngle_ = value;
00219 }
00220 }
00221 private float headAngle_ = 40.0f;
00222
00223
00230 public void Draw( System.Drawing.Graphics g, PhysicalAxis xAxis, PhysicalAxis yAxis )
00231 {
00232 if (this.To.X > xAxis.Axis.WorldMax || this.To.X < xAxis.Axis.WorldMin)
00233 return;
00234
00235 if (this.To.Y > yAxis.Axis.WorldMax || this.To.Y < yAxis.Axis.WorldMin)
00236 return;
00237
00238 double angle = this.angle_;
00239
00240 if (this.angle_ < 0.0)
00241 {
00242 int mul = -(int)(this.angle_ / 360.0) + 2;
00243 angle = angle_ + 360.0 * (double)mul;
00244 }
00245
00246 double normAngle = (double)angle % 360.0;
00247
00248 Point toPoint = new Point(
00249 (int)xAxis.WorldToPhysical( to_.X, true ).X,
00250 (int)yAxis.WorldToPhysical( to_.Y, true ).Y );
00251
00252
00253 float xDir = (float)Math.Cos( normAngle * 2.0 * Math.PI / 360.0 );
00254 float yDir = (float)Math.Sin( normAngle * 2.0 * Math.PI / 360.0 );
00255
00256 toPoint.X += (int)(xDir*headOffset_);
00257 toPoint.Y += (int)(yDir*headOffset_);
00258
00259 float xOff = physicalLength_ * xDir;
00260 float yOff = physicalLength_ * yDir;
00261
00262 Point fromPoint = new Point(
00263 (int)(toPoint.X + xOff),
00264 (int)(toPoint.Y + yOff) );
00265
00266 g.DrawLine( pen_, toPoint, fromPoint );
00267
00268 Point[] head = new Point[3];
00269
00270 head[0] = toPoint;
00271
00272 xOff = headSize_ * (float)Math.Cos( (normAngle-headAngle_/2.0f) * 2.0 * Math.PI / 360.0 );
00273 yOff = headSize_ * (float)Math.Sin( (normAngle-headAngle_/2.0f) * 2.0 * Math.PI / 360.0 );
00274
00275 head[1] = new Point(
00276 (int)(toPoint.X + xOff),
00277 (int)(toPoint.Y + yOff) );
00278
00279 float xOff2 = headSize_ * (float)Math.Cos( (normAngle+headAngle_/2.0f) * 2.0 * Math.PI / 360.0 );
00280 float yOff2 = headSize_ * (float)Math.Sin( (normAngle+headAngle_/2.0f) * 2.0 * Math.PI / 360.0 );
00281
00282 head[2] = new Point(
00283 (int)(toPoint.X + xOff2),
00284 (int)(toPoint.Y + yOff2) );
00285
00286 g.FillPolygon( arrowBrush_, head );
00287
00288 SizeF textSize = g.MeasureString( text_, font_ );
00289 SizeF halfSize = new SizeF( textSize.Width / 2.0f, textSize.Height / 2.0f );
00290
00291 float quadrantSlideLength = halfSize.Width + halfSize.Height;
00292
00293 float quadrantF = (float)normAngle / 90.0f;
00294 int quadrant = (int)quadrantF;
00295 float prop = quadrantF - (float)quadrant;
00296 float dist = prop * quadrantSlideLength;
00297
00298
00299
00300
00301
00302
00303
00304
00305
00306 PointF offsetFromMiddle = new PointF( 0.0f, 0.0f );
00307 switch (quadrant)
00308 {
00309 case 0:
00310 if (dist > halfSize.Height)
00311 {
00312 dist -= halfSize.Height;
00313 offsetFromMiddle = new PointF( -halfSize.Width + dist, halfSize.Height );
00314 }
00315 else
00316 {
00317 offsetFromMiddle = new PointF( -halfSize.Width, - dist );
00318 }
00319 break;
00320
00321 case 1:
00322 if (dist > halfSize.Width)
00323 {
00324 dist -= halfSize.Width;
00325 offsetFromMiddle = new PointF( halfSize.Width, halfSize.Height - dist );
00326 }
00327 else
00328 {
00329 offsetFromMiddle = new PointF( dist, halfSize.Height );
00330 }
00331 break;
00332
00333 case 2:
00334 if (dist > halfSize.Height)
00335 {
00336 dist -= halfSize.Height;
00337 offsetFromMiddle = new PointF( halfSize.Width - dist, -halfSize.Height );
00338 }
00339 else
00340 {
00341 offsetFromMiddle = new PointF( halfSize.Width, -dist );
00342 }
00343
00344 break;
00345
00346 case 3:
00347 if (dist > halfSize.Width)
00348 {
00349 dist -= halfSize.Width;
00350 offsetFromMiddle = new PointF( -halfSize.Width, -halfSize.Height + dist );
00351 }
00352 else
00353 {
00354 offsetFromMiddle = new PointF( -dist, -halfSize.Height );
00355 }
00356
00357 break;
00358
00359 default:
00360 throw new NPlotException( "Programmer error." );
00361
00362 }
00363
00364 g.DrawString(
00365 text_, font_, textBrush_,
00366 (int)(fromPoint.X - halfSize.Width - offsetFromMiddle.X),
00367 (int)(fromPoint.Y - halfSize.Height + offsetFromMiddle.Y) );
00368
00369 }
00370
00371
00375 public Brush TextBrush
00376 {
00377 get
00378 {
00379 return textBrush_;
00380 }
00381 set
00382 {
00383 textBrush_ = value;
00384 }
00385 }
00386
00387
00391 public Color TextColor
00392 {
00393 set
00394 {
00395 textBrush_ = new SolidBrush( value );
00396 }
00397 }
00398
00399
00403 public Color ArrowColor
00404 {
00405 get
00406 {
00407 return pen_.Color;
00408 }
00409 set
00410 {
00411 pen_.Color = value;
00412 arrowBrush_ = new SolidBrush( value );
00413 }
00414 }
00415
00416
00420 public Font TextFont
00421 {
00422 get
00423 {
00424 return this.font_;
00425 }
00426 set
00427 {
00428 this.font_ = value;
00429 }
00430 }
00431
00432
00436 public int HeadOffset
00437 {
00438 get
00439 {
00440 return headOffset_;
00441 }
00442 set
00443 {
00444 headOffset_ = value;
00445 }
00446 }
00447 private int headOffset_ = 2;
00448
00449
00450 private Brush arrowBrush_ = new SolidBrush( Color.Black );
00451 private Brush textBrush_ = new SolidBrush( Color.Black );
00452 private Pen pen_ = new Pen( Color.Black );
00453 private Font font_;
00454 }
00455 }