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C# LineSegment.DistanceSquared方法代码示例

本文整理汇总了C#中System.Windows.Media.LineSegment.DistanceSquared方法的典型用法代码示例。如果您正苦于以下问题:C# LineSegment.DistanceSquared方法的具体用法?C# LineSegment.DistanceSquared怎么用?C# LineSegment.DistanceSquared使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在System.Windows.Media.LineSegment的用法示例。


在下文中一共展示了LineSegment.DistanceSquared方法的2个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的C#代码示例。

示例1: Erase

        /// <summary>
        /// Erases paint on a pbgra32 WriteableBitmap
        /// </summary>
        /// <param name="bmp">The bitmap to modify</param>
        /// <param name="from">The starting point of the stroke</param>
        /// <param name="to">The end point of the stroke</param>
        /// <param name="size">The stroke size</param>
        public static unsafe void Erase(WriteableBitmap bmp, Point from, Point to, int size)
        {
            if (bmp == null) return;

            bmp.Lock();

            // Intermediate storage of the square of the size
            int sizesize = size * size;

            // Create a line segment representation to compare distance to
            LineSegment linesegment = new LineSegment(from, to);

            // Get a bounding box for the line segment
            BoundingBox bitmapbounds = new BoundingBox();
            BoundingBox segmentbounds = new BoundingBox();

            bitmapbounds.AddPoint(0, 0, 0);
            bitmapbounds.AddPoint(bmp.PixelWidth - 1, bmp.PixelHeight - 1, 0);

            segmentbounds.AddPoint((int)from.X, (int)from.Y, size);
            segmentbounds.AddPoint((int)to.X, (int)to.Y, size);
            segmentbounds.Clip(bitmapbounds);

            // Get a pointer to the back buffer (we use an int pointer here, since we can safely assume a 32-bit pixel format)
            Int32* start = (Int32*)bmp.BackBuffer.ToPointer();

            // Move the starting pixel to the x offset
            start += segmentbounds.Left;

            // Loop through the relevant portion of the image and figure out which pixels need to be erased
            for (int y = segmentbounds.Top; y < segmentbounds.Bottom; y++)
            {
                Int32* pixel = start + bmp.BackBufferStride / sizeof(Int32) * y;

                for (int x = segmentbounds.Left; x < segmentbounds.Right; x++)
                {
                    if (linesegment.DistanceSquared(x, y) <= sizesize)
                        *pixel = 0;

                    // Move to the next pixel
                    pixel++;
                }
            }

            bmp.AddDirtyRect(new Int32Rect(segmentbounds.Left, segmentbounds.Top, segmentbounds.Width, segmentbounds.Height));
            bmp.Unlock();
        }
开发者ID:tuannsofta,项目名称:kinect4bag,代码行数:54,代码来源:BitmapHelpers.cs

示例2: Brush

        /// <summary>
        /// Paints on a pbgra32 WriteableBitmap like a paintbrush
        /// </summary>
        /// <param name="bmp">The bitmap to modify</param>
        /// <param name="from">The starting point of the stroke</param>
        /// <param name="to">The end point of the stroke</param>
        /// <param name="previous">The point prior to the 'from' point, or null</param>
        /// <param name="color">The color of the brush</param>
        /// <param name="size">The stroke size</param>
        public static unsafe void Brush(WriteableBitmap bmp, Point from, Point to, Point? previous, Color color, int size)
        {
            if (bmp == null) return;

            bmp.Lock();

            // Intermediate storage of the square of the size
            int sizesize = size * size;
            uint flatcolor = (uint)((int)color.A << 24) + (uint)((int)color.R << 16) + (uint)((int)color.G << 8) + color.B;

            // Create a line segment representation to compare distance to
            LineSegment linesegment = new LineSegment(from, to);

            // Get a bounding box for the line segment
            BoundingBox bitmapbounds = new BoundingBox();
            BoundingBox segmentbounds = new BoundingBox();

            bitmapbounds.AddPoint(0, 0, 0);
            bitmapbounds.AddPoint(bmp.PixelWidth - 1, bmp.PixelHeight - 1, 0);

            segmentbounds.AddPoint((int)from.X, (int)from.Y, size);
            segmentbounds.AddPoint((int)to.X, (int)to.Y, size);
            segmentbounds.Clip(bitmapbounds);

            // Get a pointer to the back buffer (we use an int pointer here, since we can safely assume a 32-bit pixel format)
            UInt32* start = (UInt32*)bmp.BackBuffer.ToPointer();

            // Move the starting pixel to the x offset
            start += segmentbounds.Left;

            if (previous.HasValue)
            {
                LineSegment previoussegment = new LineSegment(previous.Value, from);

                // Loop through the relevant portion of the image and figure out which pixels need to be erased
                for (int y = segmentbounds.Top; y < segmentbounds.Bottom; y++)
                {
                    UInt32* pixel = start + bmp.BackBufferStride / sizeof(UInt32) * y;

                    for (int x = segmentbounds.Left; x < segmentbounds.Right; x++)
                    {
                        if (linesegment.DistanceSquared(x, y) <= sizesize && previoussegment.DistanceSquared(x, y) > sizesize)
                        {
                            if (color.A == 255)
                                *pixel = flatcolor;
                            else
                                WriteAlphaBlended(pixel, color);
                        }

                        // Move to the next pixel
                        pixel++;
                    }
                }
            }
            else
            {
                // Loop through the relevant portion of the image and figure out which pixels need to be erased
                for (int y = segmentbounds.Top; y < segmentbounds.Bottom; y++)
                {
                    UInt32* pixel = start + bmp.BackBufferStride / sizeof(UInt32) * y;

                    for (int x = segmentbounds.Left; x < segmentbounds.Right; x++)
                    {
                        if (linesegment.DistanceSquared(x, y) <= sizesize)
                        {
                            if (color.A == 255)
                                *pixel = flatcolor;
                            else
                                WriteAlphaBlended(pixel, color);
                        }

                        // Move to the next pixel
                        pixel++;
                    }
                }
            }

            bmp.AddDirtyRect(new Int32Rect(segmentbounds.Left, segmentbounds.Top, segmentbounds.Width, segmentbounds.Height));
            bmp.Unlock();
        }
开发者ID:tuannsofta,项目名称:kinect4bag,代码行数:89,代码来源:BitmapHelpers.cs


注:本文中的System.Windows.Media.LineSegment.DistanceSquared方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台,相关代码片段筛选自各路编程大神贡献的开源项目,源码版权归原作者所有,传播和使用请参考对应项目的License;未经允许,请勿转载。