Where to change Graphics.InterpolationMode and Graphics.PixelOffsetMode - Diagramming Components

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Where to change Graphics.InterpolationMode and Graphics.PixelOffsetMode (Read 3074 times)

Kyle Chen Full Member Offline I Love MindFusion! Posts: 104 Joined: Nov 29^th, 2012	Where to change Graphics.InterpolationMode and Graphics.PixelOffsetMode Dec 5^th, 2013 at 2:57pm	Print Post
	Hi Stoyan, Back to my old question, when I set a node's image to a bitmap with specified dpi, it will be scaled to non-integer width/height which caused some edge lines to turn gray instead of pure black or even disappear which is annoying. I wonder if it will help if I change graphics's InterpolationMode to NearestNeigbour and PixelOffsetMode to None. If so, where is the best place to do it? (still to consider the drawing performance) (What will the DiagramView.SmoothingMode affect? The enum shows it is like "PixelOffsetMode" but when I tried to change it, seems no effect at all) Thanks, Kyle


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Where to change Graphics.InterpolationMode and Graphics.PixelOffsetMode Reply #1 - Dec 6^th, 2013 at 7:32am	Print Post
	Hi Kyle, You could change Graphics rendering properties from overrides of the DiagramView.OnPaint or Diagram.Draw methods before calling base methods, or from the DrawBackground event handler, which it is raised before drawing diagram items. DiagramView.SmoothingMode is assigned to Graphics.SmoothingMode and lets you enable or disable anti-aliasing. If you use Pixel as MasureUnit, ZoomFactor is 100 and bitmap's DPI corresponds to screen's DPI, your bitmap pixels should be rendered coinciding with screen pixels. You could as well try to custom-draw images by calling GDI's DrawImageUnscaled method. I hope that helps, Stoyan


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Kyle Chen Full Member Offline I Love MindFusion! Posts: 104 Joined: Nov 29^th, 2012	Re: Where to change Graphics.InterpolationMode and Graphics.PixelOffsetMode Reply #2 - Dec 9^th, 2013 at 4:09pm	Print Post
	Hi Stoyan, Thank you so much! I override the DrawLocal of ShapeNode and set as following which generate better scale result in my application. If these properties can be exposed to DiagramView, it will be easier. (And still, the DiagramView.SmoothingMode seems no effect to this) public override void DrawLocal(MindFusion.Drawing.IGraphics graphics, RenderOptions options) { graphics.SmoothingMode = SmoothingMode.AntiAlias; graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; graphics.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.None; base.DrawLocal(graphics, options); } Kyle Stoyo wrote on Dec 6^th, 2013 at 7:32am: Hi Kyle, You could change Graphics rendering properties from overrides of the DiagramView.OnPaint or Diagram.Draw methods before calling base methods, or from the DrawBackground event handler, which it is raised before drawing diagram items. DiagramView.SmoothingMode is assigned to Graphics.SmoothingMode and lets you enable or disable anti-aliasing. If you use Pixel as MasureUnit, ZoomFactor is 100 and bitmap's DPI corresponds to screen's DPI, your bitmap pixels should be rendered coinciding with screen pixels. You could as well try to custom-draw images by calling GDI's DrawImageUnscaled method. I hope that helps, Stoyan


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