private void button1_Click(object sender, EventArgs e)
{
using (Bitmap bmp1 = new Bitmap(400, 500))
using (var bmplock = bmp1.Lock())
{
WriteableBitmap wb = bmplock.GetWritableBitmap();
//lines
int y = 0;
wb.DrawLine(0, y, 100, y + 100, System.Windows.Media.Imaging.Color.FromArgb(255, 255, 0, 0)); //red
wb.DrawLine(0, y + 100, 100, y + 0, System.Windows.Media.Imaging.Color.FromArgb(255, 0, 0, 255)); //blue
wb.DrawLineAa(100, y, 200, y + 100, System.Windows.Media.Imaging.Color.FromArgb(255, 255, 0, 0));
wb.DrawLineAa(100, y + 100, 200, y + 0, System.Windows.Media.Imaging.Color.FromArgb(255, 0, 0, 255)); //blue
//----------
y += 150;
wb.DrawLineDDA(0, y, 100, y + 100, System.Windows.Media.Imaging.Color.FromArgb(255, 255, 0, 0)); //red
wb.DrawLineDDA(0, y + 100, 100, y + 0, System.Windows.Media.Imaging.Color.FromArgb(255, 0, 0, 255)); //blue
wb.DrawEllipse(200, 0, 300, 100, System.Windows.Media.Imaging.Color.FromArgb(255, 255, 0, 0));
//
bmplock.WriteAndUnlock();
bmp1.Save("d:\\WImageTest\\a0002.png");
}
}
/// <summary>
/// Draws a colored line by connecting two points using a DDA algorithm (Digital Differential Analyzer).
/// </summary>
/// <param name="bmp">The WriteableBitmap.</param>
/// <param name="x1">The x-coordinate of the start point.</param>
/// <param name="y1">The y-coordinate of the start point.</param>
/// <param name="x2">The x-coordinate of the end point.</param>
/// <param name="y2">The y-coordinate of the end point.</param>
/// <param name="color">The color for the line.</param>
public static void DrawLineDDA(this WriteableBitmap bmp, int x1, int y1, int x2, int y2, Color color)
{
// Add one to use mul and cheap bit shift for multiplicaltion
int a = color.A + 1;
int col = (color.A << 24)
| ((byte)((color.R * a) >> 8) << 16)
| ((byte)((color.G * a) >> 8) << 8)
| ((byte)((color.B * a) >> 8));
bmp.DrawLineDDA(x1, y1, x2, y2, col);
}
protected void DrawLine(WriteableBitmap bitmap, Line line, Color color)
{
bitmap.DrawLineDDA((int)(line.from.X * width), (int)(line.from.Y * height), (int)(line.to.X * width), (int)(line.to.Y * height), color);
}
/// <summary>
/// Draws a colored line by connecting two points using a DDA algorithm (Digital Differential Analyzer).
/// </summary>
/// <param name="bmp">The WriteableBitmap.</param>
/// <param name="x1">The x-coordinate of the start point.</param>
/// <param name="y1">The y-coordinate of the start point.</param>
/// <param name="x2">The x-coordinate of the end point.</param>
/// <param name="y2">The y-coordinate of the end point.</param>
/// <param name="color">The color for the line.</param>
public static void DrawLineDDA(this WriteableBitmap bmp, int x1, int y1, int x2, int y2, Color color)
{
bmp.DrawLineDDA(x1, y1, x2, y2, (color.A << 24) | (color.R << 16) | (color.G << 8) | color.B);
}
public void Draw(WriteableBitmap bitmap)
{
bitmap.Clear(Colors.White);
double width = bitmap.Width;
double halfWidth = width / 2;
width -= 1;
double height = bitmap.Height;
double uParam = P.FirstParamLimit;
double vParam = P.SecondParamLimit;
double sParam = Q.FirstParamLimit;
double tParam = Q.SecondParamLimit;
using (bitmap.GetBitmapContext())
{
if (QtestSet != null)
{
var uStep = Q.FirstParamLimit / (QtestSet.GetLength(1) - 1.0);
var vStep = Q.SecondParamLimit / (QtestSet.GetLength(0) - 1.0);
for (int i = 0; i < QtestSet.GetLength(1); i++)
{
for (int j = 0; j < QtestSet.GetLength(0); j++)
{
bitmap.DrawEllipseCentered((int)(i * uStep / sParam * (halfWidth - 3) + halfWidth), (int)(j * vStep / tParam * height), 1, 1, QtestSet[j, i] ? Colors.LightGray : Colors.LightBlue);
}
}
}
if (pPolygon != null)
{
var minSize = System.Math.Min(P.FirstParamLimit, P.SecondParamLimit) * 0.8;
for (int i = 0; i < pPolygon.Count - 1 + (cyclic ? 1 : 0); i++)
{
var item1 = pPolygon[i];
var item2 = pPolygon[(i + 1) % pPolygon.Count];
if (System.Math.Abs(item1.X - item2.X) < minSize && System.Math.Abs(item1.Y - item2.Y) < minSize)
{
bitmap.DrawLineDDA((int)(item1.X / uParam * halfWidth), (int)(item1.Y / vParam * height), (int)(item2.X / uParam * halfWidth), (int)(item2.Y / vParam * height), Colors.BlueViolet);
}
}
}
if (IsIntersectableP)
{
if (pPolygonBoundary != null)
{
foreach (var tuple in pPolygonBoundary)
{
bitmap.DrawLineDDA((int)(tuple.Item1.X / uParam * halfWidth), (int)(tuple.Item1.Y / vParam * height), (int)(tuple.Item2.X / uParam * halfWidth), (int)(tuple.Item2.Y / vParam * height), Colors.BlueViolet);
}
}
}
if (qPolygon != null)
{
var minSize = System.Math.Min(Q.FirstParamLimit, Q.SecondParamLimit) * 0.8;
for (int i = 0; i < qPolygon.Count - 1 + (cyclic ? 1 : 0); i++)
{
var item1 = qPolygon[i];
var item2 = qPolygon[(i + 1) % qPolygon.Count];
if (System.Math.Abs(item1.X - item2.X) < minSize && System.Math.Abs(item1.Y - item2.Y) < minSize)
{
bitmap.DrawLineDDA((int)(item1.X / sParam * (halfWidth - 3) + halfWidth), (int)(item1.Y / tParam * height), (int)(item2.X / sParam * (halfWidth - 3) + halfWidth), (int)(item2.Y / tParam * height), Colors.DarkViolet);
}
}
}
if (IsIntersectableQ)
{
if (qPolygonBoundary != null)
{
foreach (var tuple in qPolygonBoundary)
{
bitmap.DrawLineDDA((int)(tuple.Item1.X / sParam * (halfWidth - 3) + halfWidth), (int)(tuple.Item1.Y / tParam * height), (int)(tuple.Item2.X / sParam * (halfWidth - 3) + halfWidth), (int)(tuple.Item2.Y / tParam * height), Colors.DarkViolet);
}
}
}
//if (PtestSet != null)
//{
// var uStep = P.FirstParamLimit / (PtestSet.GetLength(1) - 1.0);
// var vStep = P.SecondParamLimit / (PtestSet.GetLength(0) - 1.0);
// for (int i = 0; i < PtestSet.GetLength(1); i++)
// for (int j = 0; j < PtestSet.GetLength(0); j++)
// {
// bitmap.DrawEllipseCentered((int)(i * uStep / uParam * halfWidth), (int)(j * vStep / vParam * height), 1, 1, PtestSet[j, i] ? Colors.Green : Colors.Red);
// }
//}
}
}
void canvas_PointerReleased(object sender, PointerRoutedEventArgs e)
{
if (e.Pointer.PointerId == PenID || e.Pointer.PointerId == TouchID)
{
MyInkManager.ProcessPointerUp(e.GetCurrentPoint(canvas));
}
TouchID = 0;
PenID = 0;
e.Handled = true;
Pencil = null;
NewLine = null;
NewRectangle = null;
NewEllipse = null;
//to draw line on our writable bitmap not on canvas.
if (itisline)
{
wb.DrawLineDDA((int)lineX1, (int)lineY1, (int)lineX2, (int)lineY2, clr);
}
//to draw line on our actual rectangle.
if (itisrectangle)
{
if (rectX2 > rectX1 && rectY2 > rectY1)
{
wb.DrawRectangle((int)rectX1, (int)rectY1, (int)rectX2, (int)rectY2, clr);
}
else if (rectX2 < rectX1 && rectY2 < rectY1)
{
wb.DrawRectangle((int)rectX2, (int)rectY2, (int)rectX1, (int)rectY1, clr);
}
else if (rectX2 > rectX1 && rectY2 < rectY1)
{
wb.DrawRectangle((int)rectX1, (int)rectY2, (int)rectX2, (int)rectY1, clr);
}
else if (rectX2 < rectX1 && rectY2 > rectY1)
{
wb.DrawRectangle((int)rectX2, (int)rectY1, (int)rectX1, (int)rectY2, clr);
}
}
// to draw a ellipse
if (itisellipse)
{
if (elipX2 > elipX1 && elipY2 > elipY1)
{
wb.DrawEllipse((int)elipX1, (int)elipY1, (int)elipX2, (int)elipY2, clr);
}
else if (elipX2 < elipX1 && elipY2 < elipY1)
{
wb.DrawEllipse((int)elipX2, (int)elipY2, (int)elipX1, (int)elipY1, clr);
}
else if (elipX2 > elipX1 && elipY2 < elipY1)
{
wb.DrawEllipse((int)elipX1, (int)elipY2, (int)elipX2, (int)elipY1, clr);
}
else if (elipX2 < elipX1 && elipY2 > elipY1)
{
wb.DrawEllipse((int)elipX2, (int)elipY1, (int)elipX1, (int)elipY2, clr);
}
}
}
