/*
* public static void DrawGradientPath(Canvas canvas, List<TinyTypeLib.PointF> path, int gradientSize, Color color)
* {
* if (path.Count < 3)
* {
* throw new Exception("Path must have at least three points");
* }
*
* // Add the first two points to the end to make it easier to assess direction
* int originalCount = path.Count;
* path.Add(path[0]);
* path.Add(path[1]);
*
* for (int i = 0; i < originalCount; i++ )
* {
* Line line = new Line(path[i], path[i + 1]);
* DrawGradientLine(canvas, line, gradientSize, color);
* }
* }
*
* public static void DrawGradientCap(Canvas canvas, TinyTypeLib.Rect middleSquare, int quadrant, int gradientSize, Color color)
* {
* Paint paint = new Paint();
* paint.SetStyle(Paint.Style.Fill);
* Color transparent = color;
* transparent.A = 0;
*
* Point center = new Point(
* quadrant == 1 || quadrant == 4 ? middleSquare.Right : middleSquare.Left,
* quadrant == 1 || quadrant == 2 ? middleSquare.Top : middleSquare.Bottom);
*
* int startAngle = (4 - quadrant) * 90;
*
* paint.SetShader(new RadialGradient(center.X, center.Y, gradientSize, color, transparent, Shader.TileMode.Mirror));
* canvas.DrawArc(new RectF(
* center.X - gradientSize,
* center.Y - gradientSize,
* center.X + gradientSize,
* center.Y + gradientSize), startAngle, 90, true, paint);
*
* }
*/
// gradientSize is the distance from the line to half-way through the gradient's fade
// The direction of the gradient is controlled by the sign of signedGradientSize
public static void DrawGradientLine(Canvas canvas, Line line, int signedGradientSize, Color color, TinyTypeLib.Rect clipRect)
{
// Allow for a little overlap. For some reason, Android leaves a white line even though the clipRects were lining up.
clipRect = new TinyTypeLib.Rect(clipRect.Left - 1, clipRect.Top - 1, clipRect.Right + 1, clipRect.Bottom + 1);
int gradientSizeAbs = Math.Abs(signedGradientSize);
Line perpendicular = line.GetPerpendicular(gradientSizeAbs);
Paint paint = new Paint();
paint.SetStyle(Paint.Style.Stroke);
paint.StrokeCap = Paint.Cap.Butt;
// Here we need to solve for the gradient's start point, or the location of B. We'll solve for angle C and length a to find that out.
double c = line.Length;
double b = gradientSizeAbs;
/*
* B____c_____A
* \ /
* a\ /b
* \/
* C=90
*/
// Solve for angle B in radians. B = sin-1(b/c)
double B = Math.Asin(b / c);
// Solve for length a. a^2+b^2 = c^2, so a = sqrt(c^2-b^2)
double a = Math.Sqrt((c * c) - (b * b));
int direction = signedGradientSize > 0 ? -1 : 1;
double finalAngle = direction * B + line.Angle;
Line test = new Line(866, 313.5f, 678, 313.5f);
double ang = test.Angle; // should be 3.14
Line l = new Line(line.Start, finalAngle, a);
Line gradientLine = new Line(l.End, line.End);
canvas.ClipRect(AndroidUtil.GetRect(clipRect));
paint.StrokeWidth = gradientSizeAbs * 2;
paint.SetShader(new LinearGradient(gradientLine.Start.X, gradientLine.Start.Y, gradientLine.End.X, gradientLine.End.Y, color, AndroidUtil.GetTransparentColor(color), Shader.TileMode.Mirror));
canvas.DrawLine(l.Start.X, l.Start.Y, l.End.X, l.End.Y, paint);
}
public static void DrawGradientCap(Canvas canvas, TinyTypeLib.Rect middleSquare, int quadrant, int gradientSize, Color color)
{
Paint paint = new Paint();
paint.SetStyle(Paint.Style.Fill);
Color transparent = color;
transparent.A = 0;
Point center = new Point(
quadrant == 1 || quadrant == 4 ? middleSquare.Right : middleSquare.Left,
quadrant == 1 || quadrant == 2 ? middleSquare.Top : middleSquare.Bottom);
int startAngle = (4 - quadrant) * 90;
paint.SetShader(new RadialGradient(center.X, center.Y, gradientSize, color, transparent, Shader.TileMode.Mirror));
canvas.DrawArc(new RectF(
center.X - gradientSize,
center.Y - gradientSize,
center.X + gradientSize,
center.Y + gradientSize), startAngle, 90, true, paint);
}
private void DrawLetters(Canvas canvas)
{
Paint letterPaint = new Paint();
letterPaint.StrokeWidth = 1;
letterPaint.SetStyle(Paint.Style.Stroke);
int rectWidth = (int)(mViewInfo.Width / 11.0);
int rectHeight = (int)(mViewInfo.Height / 11.0);
letterPaint.TextSize = Math.Min(rectHeight, 80);
for (int i = 0; i < 11; i++)
{
for (int j = 0; j < 11; j++)
{
letterPaint.SetStyle(Paint.Style.Stroke);
//canvas.DrawRect(new Android.Graphics.Rect(i * rectWidth, j * rectHeight, (i + 1) * rectWidth, (j + 1) * rectHeight), paint);
KeyValuePair <int, int> index = new KeyValuePair <int, int>(i, j);
if (sSignatureLocations.ContainsKey(index))
{
Signature sig = sSignatureLocations[index];
char chr = Arrangement.Layout[sig].Character;
char chrToMeasure = chr == ' ' ? 'X' : chr;
int x = i * rectWidth;
int y = j * rectHeight;
Android.Graphics.Rect rect = new Android.Graphics.Rect(x, y, x + rectWidth, y + rectHeight);
// The actual character is used for horizontal positioning
Android.Graphics.Rect characterBounds = new Android.Graphics.Rect();
letterPaint.GetTextBounds(chrToMeasure.ToString(), 0, 1, characterBounds);
// A standard character is used for vertical positioning so all the characters line up
Android.Graphics.Rect xBounds = new Android.Graphics.Rect();
letterPaint.GetTextBounds("X", 0, 1, xBounds);
// Center the character in the rectangle
int textLeft = rect.Left + (int)((rect.Width() - characterBounds.Width()) / 2.0);
int textBottom = rect.Bottom - (int)((rect.Height() - xBounds.Width()) / 2.0);
// Lift the bottom up away from the border if we're on the bottom row
//int textBottom = rect.Bottom - (j == 10 ? 10 : 0);
TinyTypeLib.Rect boundsInLocation = new TinyTypeLib.Rect(rect.Left, textBottom - xBounds.Height(), rect.Right, textBottom);
if (sig == mViewInfo.CurrentSignature)
{
// Don't draw within the MiddleSquare
canvas.ClipRect(new Android.Graphics.Rect(mViewInfo.Left, mViewInfo.Top, mViewInfo.Right, mViewInfo.Bottom));
Path cp = new Path();
cp.AddCircle(mViewInfo.MiddleSquare.Center.X, mViewInfo.MiddleSquare.Center.Y, mViewInfo.MiddleSquare.Width / 2f, Path.Direction.Cw);
canvas.ClipPath(cp, Region.Op.Difference);
//canvas.ClipRect(Converter.TinyTypeRectToAndroidRect(mViewInfo.MiddleSquare), Region.Op.Difference);
int gradientSize = 20;
Paint linePaint = new Paint();
// Draw a line to the circle we're about to draw
Line lineToLetter = new Line(mViewInfo.MiddleSquare.Center, boundsInLocation.Center);
Line perpendicular = lineToLetter.GetPerpendicular(gradientSize);
Color color = GetPositionColor((Position)mViewInfo.CurrentSignature.StartHeading.Quadrant);
Color transparent = AndroidUtil.GetTransparentColor(color);
linePaint.SetShader(new LinearGradient(perpendicular.Start.X, perpendicular.Start.Y, perpendicular.End.X, perpendicular.End.Y, color, transparent, Shader.TileMode.Mirror));
linePaint.SetStyle(Paint.Style.Stroke);
linePaint.StrokeWidth = gradientSize * 2;
linePaint.StrokeCap = Paint.Cap.Round;
canvas.DrawLine(lineToLetter.Start.X, lineToLetter.Start.Y, lineToLetter.End.X, lineToLetter.End.Y, linePaint);
}
else
{
//letterPaint.Color = new Color(255, 0, 255);
}
if (chr != char.MinValue)
{
// Fill a circle in the background of the circle
Paint letterBackgroundPaint = new Paint();
Color letterBackgroundColor = GetPositionColor((Position)sig.StartQuadrant);
Color letterBackgroundTransparent = AndroidUtil.GetTransparentColor(letterBackgroundColor);
float radius = Math.Max(boundsInLocation.Width, boundsInLocation.Height) / 2f;
letterBackgroundPaint.SetShader(new RadialGradient(boundsInLocation.Center.X, boundsInLocation.Center.Y, radius, letterBackgroundColor, letterBackgroundTransparent, Shader.TileMode.Mirror));
letterBackgroundPaint.SetStyle(Paint.Style.FillAndStroke);
canvas.DrawCircle(boundsInLocation.Center.X, boundsInLocation.Center.Y, (float)(Math.Max(boundsInLocation.Width, boundsInLocation.Height) / 2.0), letterBackgroundPaint);
letterPaint.SetStyle(Paint.Style.FillAndStroke);
canvas.DrawText(chr.ToString(), textLeft, textBottom, letterPaint);
}
}
}
}
letterPaint.SetStyle(Paint.Style.FillAndStroke);
letterPaint.Color = GetPositionColor(Position.Middle);
letterPaint.TextSize = mViewInfo.MiddleSquare.Height * 0.75f;
Drawing.ClearClip(canvas, mViewInfo);
// Draw the selected character in the middle of the square
if (mViewInfo.CurrentSignature.Gesture == Signature.Gestures.Normal)
{
char chr = Arrangement.Layout[mViewInfo.CurrentSignature].Character;
// Center the character in the rectangle
Android.Graphics.Rect bounds = new Android.Graphics.Rect();
letterPaint.GetTextBounds(chr.ToString(), 0, 1, bounds);
int textLeft = mViewInfo.MiddleSquare.Left + (int)((mViewInfo.MiddleSquare.Width - bounds.Width()) / 2.0);
int textBottom = mViewInfo.MiddleSquare.Bottom - (int)((mViewInfo.MiddleSquare.Height - bounds.Height()) / 2.0);
canvas.DrawText(chr.ToString(), textLeft, textBottom, letterPaint);
}
/*
* // Draw the previous character above the center square
* if (mPreviousCharacter != char.MinValue)
* {
* TinyTypeLib.Rect rect = mViewInfo.MiddleSquare.Offset(0, -mViewInfo.MiddleSquare.Height);
*
* //paint.SetStyle(Paint.Style.Stroke);
* //canvas.DrawRect(Converter.TinyTypeRectToAndroidRect(rect), paint);
* //paint.SetStyle(Paint.Style.FillAndStroke);
*
* // Center the character in the rectangle
* Android.Graphics.Rect bounds = new Android.Graphics.Rect();
* letterPaint.GetTextBounds(mPreviousCharacter.ToString(), 0, 1, bounds);
*
* int textLeft = rect.Left + (int)((rect.Width - bounds.Width()) / 2.0);
* int textBottom = rect.Bottom - (int)((rect.Height - bounds.Height()) / 2.0);
*
* canvas.DrawText(mPreviousCharacter.ToString(), textLeft, textBottom, letterPaint);
* }*/
}