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#region Header
//
//   Project:           WriteableBitmapEx - WriteableBitmap extensions
//   Description:       Collection of extension methods for the WriteableBitmap class.
//
//   Changed by:        $Author: unknown $
//   Changed on:        $Date: 2015-07-20 11:44:36 +0200 (Mo, 20 Jul 2015) $
//   Changed in:        $Revision: 114480 $
//   Project:           $URL: https://writeablebitmapex.svn.codeplex.com/svn/trunk/Source/WriteableBitmapEx/WriteableBitmapShapeExtensions.cs $
//   Id:                $Id: WriteableBitmapShapeExtensions.cs 114480 2015-07-20 09:44:36Z unknown $
//
//
//   Copyright © 2009-2015 Rene Schulte and WriteableBitmapEx Contributors
//
//   This code is open source. Please read the License.txt for details. No worries, we won't sue you! ;)
//
#endregion

using System;

#if NETFX_CORE
namespace Windows.UI.Xaml.Media.Imaging
#else
namespace System.Windows.Media.Imaging
#endif
{
    /// <summary>
    /// Collection of extension methods for the WriteableBitmap class.
    /// </summary>
    internal
#if WPF
    unsafe
#endif
 static partial class WriteableBitmapExtensions
    {
        #region Methods

        #region Draw Shapes

        #region Polyline, Triangle, Quad

        /// <summary>
        /// Draws a polyline. Add the first point also at the end of the array if the line should be closed.
        /// </summary>
        /// <param name="bmp">The WriteableBitmap.</param>
        /// <param name="points">The points of the polyline in x and y pairs, therefore the array is interpreted as (x1, y1, x2, y2, ..., xn, yn).</param>
        /// <param name="color">The color for the line.</param>
        internal static void DrawPolyline(this WriteableBitmap bmp, int[] points, Color color)
        {
            var col = ConvertColor(color);
            bmp.DrawPolyline(points, col);
        }

        /// <summary>
        /// Draws a polyline anti-aliased. Add the first point also at the end of the array if the line should be closed.
        /// </summary>
        /// <param name="bmp">The WriteableBitmap.</param>
        /// <param name="points">The points of the polyline in x and y pairs, therefore the array is interpreted as (x1, y1, x2, y2, ..., xn, yn).</param>
        /// <param name="color">The color for the line.</param>
        internal static void DrawPolyline(this WriteableBitmap bmp, int[] points, int color)
        {
            using (var context = bmp.GetBitmapContext())
            {
                // Use refs for faster access (really important!) speeds up a lot!
                var w = context.Width;
                var h = context.Height;
                var x1 = points[0];
                var y1 = points[1];

                for (var i = 2; i < points.Length; i += 2)
                {
                    var x2 = points[i];
                    var y2 = points[i + 1];

                    DrawLine(context, w, h, x1, y1, x2, y2, color);
                    x1 = x2;
                    y1 = y2;
                }
            }
        }

        /// <summary>
        /// Draws a polyline. Add the first point also at the end of the array if the line should be closed.
        /// </summary>
        /// <param name="bmp">The WriteableBitmap.</param>
        /// <param name="points">The points of the polyline in x and y pairs, therefore the array is interpreted as (x1, y1, x2, y2, ..., xn, yn).</param>
        /// <param name="color">The color for the line.</param>
        internal static void DrawPolylineAa(this WriteableBitmap bmp, int[] points, Color color)
        {
            var col = ConvertColor(color);
            bmp.DrawPolylineAa(points, col);
        }

        /// <summary>
        /// Draws a polyline anti-aliased. Add the first point also at the end of the array if the line should be closed.
        /// </summary>
        /// <param name="bmp">The WriteableBitmap.</param>
        /// <param name="points">The points of the polyline in x and y pairs, therefore the array is interpreted as (x1, y1, x2, y2, ..., xn, yn).</param>
        /// <param name="color">The color for the line.</param>
        internal static void DrawPolylineAa(this WriteableBitmap bmp, int[] points, int color)
        {
            using (var context = bmp.GetBitmapContext())
            {
                // Use refs for f
class="p">.Width; var h = context.Height; var x1 = points[0]; var y1 = points[1]; for (var i = 2; i < points.Length; i += 2) { var x2 = points[i]; var y2 = points[i + 1]; DrawLineAa(context, w, h, x1, y1, x2, y2, color); x1 = x2; y1 = y2; } } } /// <summary> /// Draws a triangle. /// </summary> /// <param name="bmp">The WriteableBitmap.</param> /// <param name="x1">The x-coordinate of the 1st point.</param> /// <param name="y1">The y-coordinate of the 1st point.</param> /// <param name="x2">The x-coordinate of the 2nd point.</param> /// <param name="y2">The y-coordinate of the 2nd point.</param> /// <param name="x3">The x-coordinate of the 3rd point.</param> /// <param name="y3">The y-coordinate of the 3rd point.</param> /// <param name="color">The color.</param> internal static void DrawTriangle(this WriteableBitmap bmp, int x1, int y1, int x2, int y2, int x3, int y3, Color color) { var col = ConvertColor(color); bmp.DrawTriangle(x1, y1, x2, y2, x3, y3, col); } /// <summary> /// Draws a triangle. /// </summary> /// <param name="bmp">The WriteableBitmap.</param> /// <param name="x1">The x-coordinate of the 1st point.</param> /// <param name="y1">The y-coordinate of the 1st point.</param> /// <param name="x2">The x-coordinate of the 2nd point.</param> /// <param name="y2">The y-coordinate of the 2nd point.</param> /// <param name="x3">The x-coordinate of the 3rd point.</param> /// <param name="y3">The y-coordinate of the 3rd point.</param> /// <param name="color">The color.</param> internal static void DrawTriangle(this WriteableBitmap bmp, int x1, int y1, int x2, int y2, int x3, int y3, int color) { using (var context = bmp.GetBitmapContext()) { // Use refs for faster access (really important!) speeds up a lot! int w = context.Width; int h = context.Height; DrawLine(context, w, h, x1, y1, x2, y2, color); DrawLine(context, w, h, x2, y2, x3, y3, color); DrawLine(context, w, h, x3, y3, x1, y1, color); } } /// <summary> /// Draws a quad. /// </summary> /// <param name="bmp">The WriteableBitmap.</param> /// <param name="x1">The x-coordinate of the 1st point.</param> /// <param name="y1">The y-coordinate of the 1st point.</param> /// <param name="x2">The x-coordinate of the 2nd point.</param> /// <param name="y2">The y-coordinate of the 2nd point.</param> /// <param name="x3">The x-coordinate of the 3rd point.</param> /// <param name="y3">The y-coordinate of the 3rd point.</param> /// <param name="x4">The x-coordinate of the 4th point.</param> /// <param name="y4">The y-coordinate of the 4th point.</param> /// <param name="color">The color.</param> internal static void DrawQuad(this WriteableBitmap bmp, int x1, int y1, int x2, int y2, int x3, int y3, int x4, int y4, Color color) { var col = ConvertColor(color); bmp.DrawQuad(x1, y1, x2, y2, x3, y3, x4, y4, col); } /// <summary> /// Draws a quad. /// </summary> /// <param name="bmp">The WriteableBitmap.</param> /// <param name="x1">The x-coordinate of the 1st point.</param> /// <param name="y1">The y-coordinate of the 1st point.</param> /// <param name="x2">The x-coordinate of the 2nd point.</param> /// <param name="y2">The y-coordinate of the 2nd point.</param> /// <param name="x3">The x-coordinate of the 3rd point.</param> /// <param name="y3">The y-coordinate of the 3rd point.</param> /// <param name="x4">The x-coordinate of the 4th point.</param> /// <param name="y4">The y-coordinate of the 4th point.</param> /// <param name="color">The color.</param> internal static void DrawQuad(this WriteableBitmap bmp, int x1, int y1, int x2, int y2, int x3, int y3, int x4, int y4, int color) { using (var context = bmp.GetBitmapContext()) { // Use refs for faster access (really important!) speeds up a lot! int w = context.Width; int h = context.Height; DrawLine(context, w, h, x1, y1, x2, y2, color); DrawLine(context, w, h, x2, y2, x3, y3, color); DrawLine(context, w, h, x3, y3, x4, y4, color); DrawLine(context, w, h, x4, y4, x1, y1, color); } } #endregion #region Rectangle /// <summary> /// Draws a rectangle. /// x2 has to be greater than x1 and y2 has to be greater than y1. /// </summary> /// <param name="bmp">The WriteableBitmap.</param> /// <param name="x1">The x-coordinate of the bounding rectangle's left side.</param> /// <param name="y1">The y-coordinate of the bounding rectangle's top side.</param> /// <param name="x2">The x-coordinate of the bounding rectangle's right side.</param> /// <param name="y2">The y-coordinate of the bounding rectangle's bottom side.</param> /// <param name="color">The color.</param> internal static void DrawRectangle(this WriteableBitmap bmp, int x1, int y1, int x2, int y2, Color color) { var col = ConvertColor(color); bmp.DrawRectangle(x1, y1, x2, y2, col); } /// <summary> /// Draws a rectangle. /// x2 has to be greater than x1 and y2 has to be greater than y1. /// </summary> /// <param name="bmp">The WriteableBitmap.</param> /// <param name="x1">The x-coordinate of the bounding rectangle's left side.</param> /// <param name="y1">The y-coordinate of the bounding rectangle's top side.</param> /// <param name="x2">The x-coordinate of the bounding rectangle's right side.</param> /// <param name="y2">The y-coordinate of the bounding rectangle's bottom side.</param> /// <param name="color">The color.</param> internal static void DrawRectangle(this WriteableBitmap bmp, int x1, int y1, int x2, int y2, int color) { using (var context = bmp.GetBitmapContext()) { // Use refs for faster access (really important!) speeds up a lot! var w = context.Width; var h = context.Height; var pixels = context.Pixels; // Check boundaries if ((x1 < 0 && x2 < 0) || (y1 < 0 && y2 < 0) || (x1 >= w && x2 >= w) || (y1 >= h && y2 >= h)) { return; } // Clamp boundaries if (x1 < 0) { x1 = 0; } if (y1 < 0) { y1 = 0; } if (x2 < 0) { x2 = 0; } if (y2 < 0) { y2 = 0; } if (x1 >= w) { x1 = w - 1; } if (y1 >= h) { y1 = h - 1; } if (x2 >= w) { x2 = w - 1; } if (y2 >= h) { y2 = h - 1; } var startY = y1 * w; var endY = y2 * w; var offset2 = endY + x1; var endOffset = startY + x2; var startYPlusX1 = startY + x1; // top and bottom horizontal scanlines for (var x = startYPlusX1; x <= endOffset; x++) { pixels[x] = color; // top horizontal line pixels[offset2] = color; // bottom horizontal line offset2++; } // offset2 == endY + x2 // vertical scanlines endOffset = startYPlusX1 + w; offset2 -= w; for (var y = startY + x2 + w; y <= offset2; y += w) { pixels[y] = color; // right vertical line pixels[endOffset] = color; // left vertical line endOffset += w; } } } #endregion #region Ellipse /// <summary> /// A Fast Bresenham Type Algorithm For Drawing Ellipses http://homepage.smc.edu/kennedy_john/belipse.pdf /// x2 has to be greater than x1 and y2 has to be greater than y1. /// </summary> /// <param name="bmp">The WriteableBitmap.</param> /// <param name="x1">The x-coordinate of the bounding rectangle's left side.</param> /// <param name="y1">The y-coordinate of the bounding rectangle's top side.</param> /// <param name="x2">The x-coordinate of the bounding rectangle's right side.</param> /// <param name="y2">The y-coordinate of the bounding rectangle's bottom side.</param> /// <param name="color">The color for the line.</param> internal static void DrawEllipse(this WriteableBitmap bmp, int x1, int y1, int x2, int y2, Color color) { var col = ConvertColor(color); bmp.DrawEllipse(x1, y1, x2, y2, col); } /// <summary> /// A Fast Bresenham Type Algorithm For Drawing Ellipses http://homepage.smc.edu/kennedy_john/belipse.pdf /// x2 has to be greater than x1 and y2 has to be greater than y1. /// </summary> /// <param name="bmp">The WriteableBitmap.</param> /// <param name="x1">The x-coordinate of the bounding rectangle's left side.</param> /// <param name="y1">The y-coordinate of the bounding rectangle's top side.</param> /// <param name="x2">The x-coordinate of the bounding rectangle's right side.</param> /// <param name="y2">The y-coordinate of the bounding rectangle's bottom side.</param> /// <param name="color">The color for the line.</param> internal static void DrawEllipse(this WriteableBitmap bmp, int x1, int y1, int x2, int y2, int color) { // Calc center and radius int xr = (x2 - x1) >> 1; int yr = (y2 - y1) >> 1; int xc = x1 + xr; int yc = y1 + yr; bmp.DrawEllipseCentered(xc, yc, xr, yr, color); } /// <summary> /// A Fast Bresenham Type Algorithm For Drawing Ellipses http://homepage.smc.edu/kennedy_john/belipse.pdf /// Uses a different parameter representation than DrawEllipse(). /// </summary> /// <param name="bmp">The WriteableBitmap.</param> /// <param name="xc">The x-coordinate of the ellipses center.</param> /// <param name="yc">The y-coordinate of the ellipses center.</param> /// <param name="xr">The radius of the ellipse in x-direction.</param> /// <param name="yr">The radius of the ellipse in y-direction.</param> /// <param name="color">The color for the line.</param> internal static void DrawEllipseCentered(this WriteableBitmap bmp, int xc, int yc, int xr, int yr, Color color) { var col = ConvertColor(color); bmp.DrawEllipseCentered(xc, yc, xr, yr, col); } /// <summary> /// A Fast Bresenham Type Algorithm For Drawing Ellipses http://homepage.smc.edu/kennedy_john/belipse.pdf /// Uses a different parameter representation than DrawEllipse(). /// </summary> /// <param name="bmp">The WriteableBitmap.</param> /// <param name="xc">The x-coordinate of the ellipses center.</param> /// <param name="yc">The y-coordinate of the ellipses center.</param> /// <param name="xr">The radius of the ellipse in x-direction.</param> /// <param name="yr">The radius of the ellipse in y-direction.</param> /// <param name="color">The color for the line.</param> internal static void DrawEllipseCentered(this WriteableBitmap bmp, int xc, int yc, int xr, int yr, int color) { // Use refs for faster access (really important!) speeds up a lot! using (var context = bmp.GetBitmapContext()) { var pixels = context.Pixels; var w = context.Width; var h = context.Height; // Avoid endless loop if (xr < 1 || yr < 1) { return; } // Init vars int uh, lh, uy, ly, lx, rx; int x = xr; int y = 0; int xrSqTwo = (xr * xr) << 1; int yrSqTwo = (yr * yr) << 1; int xChg = yr * yr * (1 - (xr << 1)); int yChg = xr * xr; int err = 0; int xStopping = yrSqTwo * xr; int yStopping = 0; // Draw first set of points counter clockwise where tangent line slope > -1. while (xStopping >= yStopping) { // Draw 4 quadrant points at once uy = yc + y; // Upper half ly = yc - y; // Lower half if (uy < 0) uy = 0; // Clip if (uy >= h) uy = h - 1; // ... if (ly < 0) ly = 0; if (ly >= h) ly = h - 1; uh = uy * w; // Upper half lh = ly * w; // Lower half rx = xc + x; lx = xc - x; if (rx < 0) rx = 0; // Clip if (rx >= w) rx = w - 1; // ... if (lx < 0) lx = 0; if (lx >= w) lx = w - 1; pixels[rx + uh] = color; // Quadrant I (Actually an octant) pixels[lx + uh] = color; // Quadrant II pixels[lx + lh] = color; // Quadrant III pixels[rx + lh] = color; // Quadrant IV y++; yStopping += xrSqTwo; err += yChg; yChg += xrSqTwo; if ((xChg + (err << 1)) > 0) { x--; xStopping -= yrSqTwo; err += xChg; xChg += yrSqTwo; } } // ReInit vars x = 0; y = yr; uy = yc + y; // Upper half ly = yc - y; // Lower half if (uy < 0) uy = 0; // Clip if (uy >= h) uy = h - 1; // ... if (ly < 0) ly = 0; if (ly >= h) ly = h - 1; uh = uy * w; // Upper half lh = ly * w; // Lower half xChg = yr * yr; yChg = xr * xr * (1 - (yr << 1)); err = 0; xStopping = 0; yStopping = xrSqTwo * yr; // Draw second set of points clockwise where tangent line slope < -1. while (xStopping <= yStopping) { // Draw 4 quadrant points at once rx = xc + x; lx = xc - x; if (rx < 0) rx = 0; // Clip if (rx >= w) rx = w - 1; // ... if (lx < 0) lx = 0; if (lx >= w) lx = w - 1; pixels[rx + uh] = color; // Quadrant I (Actually an octant) pixels[lx + uh] = color; // Quadrant II pixels[lx + lh] = color; // Quadrant III pixels[rx + lh] = color; // Quadrant IV x++; xStopping += yrSqTwo; err += xChg; xChg += yrSqTwo; if ((yChg + (err << 1)) > 0) { y--; uy = yc + y; // Upper half ly = yc - y; // Lower half if (uy < 0) uy = 0; // Clip if (uy >= h) uy = h - 1; // ... if (ly < 0) ly = 0; if (ly >= h) ly = h - 1; uh = uy * w; // Upper half lh = ly * w; // Lower half yStopping -= xrSqTwo; err += yChg; yChg += xrSqTwo; } } } } #endregion #endregion #endregion } }