【WIN10】WIN2D——圖像處理

源碼下載：http://yunpan.cn/c3iNuHFFAcr8h  访问密码 8e48

還是先來看下截圖：

實現了幾個效果：放大、縮小、旋轉、左右翻轉、上下翻轉，亮度變化、灰度圖、對比度、高斯模糊。

放大、縮小代碼：

private void scale(float x)
{
    scale_ *= x;
    using (var ds = board_.CreateDrawingSession())
    {
        ds.Transform = Matrix3x2.CreateScale(scale_);
        ds.Clear(Colors.Black);
        ds.DrawImage(oriImage_);
    }

    transform.Invalidate();
}

private void zoomIn_Click(object sender, RoutedEventArgs e)
{
    scale(1.1f);
}

private void zoomOut_Click(object sender, RoutedEventArgs e)
{
    scale(1 / 1.1f);
}

旋轉代碼（注意，默認轉動方向是鐘錶方向——順時針）：

private void rotate_Click(object sender, RoutedEventArgs e)
{
    rotate_radians_ += 90;
    using (var ds = board_.CreateDrawingSession())
    {
        ds.Transform = Matrix3x2.CreateRotation(rotate_radians_ * (float)Math.PI / 180, new Vector2((float)oriImageRc_.Width / 2.0f, (float)oriImageRc_.Height / 2.0f));
        ds.Clear(Colors.Black);
        ds.DrawImage(oriImage_);
    }

    transform.Invalidate();
}

左右、上下翻轉代碼：

private void left_right_Click(object sender, RoutedEventArgs e)
{
    left_right_direction_ = -left_right_direction_;

    using (var ds = board_.CreateDrawingSession())
    {
        ds.Transform = Matrix3x2.CreateScale(new Vector2(left_right_direction_, top_bottom_direction_), new Vector2((float)oriImageRc_.Width / 2.0f, (float)oriImageRc_.Height / 2.0f));
        ds.Clear(Colors.Black);
        ds.DrawImage(oriImage_);
    }

    transform.Invalidate();
}

private void top_bottom_Click(object sender, RoutedEventArgs e)
{
    top_bottom_direction_ = -top_bottom_direction_;

    using (var ds = board_.CreateDrawingSession())
    {
        ds.Transform = Matrix3x2.CreateScale(new Vector2(left_right_direction_, top_bottom_direction_), new Vector2((float)oriImageRc_.Width / 2.0f, (float)oriImageRc_.Height / 2.0f));
        ds.Clear(Colors.Black);
        ds.DrawImage(oriImage_);
    }

    transform.Invalidate();
}

亮度、灰度、對比度、高斯，均使用Effect效果，其效果放在名字空間：

Microsoft.Graphics.Canvas.Effects

具體代碼：

亮度，注意，我使用了WhitePoint，還有BlackPoint，請讀者自己試驗效果。而且亮度的範圍為：[0-1)，注意閉包關係。

private void lightSlider_ValueChanged(object sender, RangeBaseValueChangedEventArgs e)
        {
            if (board_ == null) return;

            using (var ds = board_.CreateDrawingSession())
            {
                Microsoft.Graphics.Canvas.Effects.BrightnessEffect brightness = new Microsoft.Graphics.Canvas.Effects.BrightnessEffect();
                if (e.NewValue >= 0.000001)
                {
                    brightness.WhitePoint = new Vector2(0, (float)e.NewValue);
                }
                else
                {
                    brightness.WhitePoint = new Vector2(-(float)e.NewValue, 0);
                }

                brightness.Source = oriImage_;

                ds.Clear(Colors.Black);
                ds.DrawImage(brightness);
            }

            transform.Invalidate();
        }

灰度：

        private void gray_Click(object sender, RoutedEventArgs e)
        {
            Microsoft.Graphics.Canvas.Effects.GrayscaleEffect grayEffect = new Microsoft.Graphics.Canvas.Effects.GrayscaleEffect();
            grayEffect.Source = oriImage_;

            using (var ds = board_.CreateDrawingSession())
            {
                ds.Clear(Colors.Black);
                ds.DrawImage(grayEffect);
            }
            transform.Invalidate();
        }

對比度：

        private void constrastSlider_ValueChanged(object sender, RangeBaseValueChangedEventArgs e)
        {
            if (board_ == null) return;

            Microsoft.Graphics.Canvas.Effects.ContrastEffect constrastEffect = new Microsoft.Graphics.Canvas.Effects.ContrastEffect();
            constrastEffect.Contrast = (float)e.NewValue;
            constrastEffect.Source = oriImage_;

            using (var ds = board_.CreateDrawingSession())
            {
                ds.Clear(Colors.Black);
                ds.DrawImage(constrastEffect);
            }
            transform.Invalidate();
        }

高斯：

private void gaussianSlider_ValueChanged(object sender, RangeBaseValueChangedEventArgs e)
        {
            if (board_ == null) return;

            Microsoft.Graphics.Canvas.Effects.GaussianBlurEffect gaussianEffect = new Microsoft.Graphics.Canvas.Effects.GaussianBlurEffect();
            gaussianEffect.BlurAmount = (float)e.NewValue;
            gaussianEffect.Source = oriImage_;

            using (var ds = board_.CreateDrawingSession())
            {
                ds.Clear(Colors.Black);
                ds.DrawImage(gaussianEffect);
            }
            transform.Invalidate();
        }