c# - Panel displays scaled images -


i using code draw scrollable panel on win form. imagebox 512x512 , image using 1024x768 (added resource):

imagebox1.image = properties.resources.test;

unfortunately, seems image scaled reasons - cannot scroll it's border. if use 512x512 image, doesn't fit imagebox, seems cropped. ideas going on here? 

using system; using system.drawing; using system.windows.forms;  class imagebox : panel {     public imagebox() {         this.autoscroll = true;         this.doublebuffered = true;     }     private image mimage;     public image image {         { return mimage; }         set {             mimage = value;             if (mimage != null) this.autoscrollminsize = mimage.size;             else this.autoscrollminsize = new size(0, 0);             this.invalidate();         }     }     protected override void onpaint(painteventargs e) {         e.graphics.translatetransform(this.autoscrollposition.x, this.autoscrollposition.y);         if (mimage != null) e.graphics.drawimage(mimage, 0, 0);         base.onpaint(e);     } }

it issue resolution of image, less resolution of display. pretty unusual.

there more 1 workaround this. @taw's approach works favors monitor resolution. you'll sharper image not close image size recorded. other approach keep physical size, drawimage() does, , adjust scrollbars accordingly. change image property setter to:

    set {         mimage = value;         if (value == null) this.autoscrollminsize = new size(0, 0);         else {             var size = value.size;             using (var gr = this.creategraphics()) {                 size.width = (int)(size.width * gr.dpix / value.horizontalresolution);                 size.height = (int)(size.height * gr.dpiy / value.verticalresolution);             }             this.autoscrollminsize = size;         }         this.invalidate();     }

picking "right" approach not obvious, ought consider adding property can change needed.


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