I have a pictureBox in my program. This pictureBox is kind a "unlimited" working area for my other controls(it's width and height growing all the time, when some of my controls located inside this pictureBox came close to pictureBox's borders). I implement scrollBars for pictureBox by myself programatically, It's just changing control's location inside the pictureBox. Now i also want to implement scrollable background. I want that backgrounds position changed as well as a controls when i scroll scrollBar. I create code for that (i simplify it for easy reading. Here is only logic for horizontal scrollBar. I call it when ScrollBar event works):
public Bitmap DrawImageUnscaled(int x, int y, int width, int height)
{
//this is the part of the image that will be cropped
Bitmap croppedPartBitmpap = new Bitmap(width, height);
Rectangle croppedPartRectangle = new Rectangle(x, y, width, height);
using (var g = Graphics.FromImage(croppedPartBitmpap))
{
//BigBitmap - original background
g.DrawImage(this.BigBitmap, 0, 0, croppedPartRectangle, GraphicsUnit.Pixel);
}
//this is the part of the image that will left
Bitmap leftPartBitmap = new Bitmap(this.PanelWidth - width, height);
Rectangle leftPartRectangle = new Rectangle(width, y,this.PanelWidth - width, height);
using (var g = Graphics.FromImage(leftPartBitmap))
{
g.DrawImage(this.BigBitmap, 0, 0, leftPartRectangle, GraphicsUnit.Pixel);
}
//this is the merged image
Bitmap mergedBitmap = new Bitmap(this.PanelWidth, this.PanelHeight);
using (var g = Graphics.FromImage(mergedBitmap))
{
g.DrawImage(leftPartBitmap, 0, 0);
g.DrawImage(croppedPartBitmpap, leftPartBitmap.Width, 0);
}
return mergedBitmap;
}
When i scroll this pictureBox area, program is cropping part of background that goes out of the boundaries and after this merged it at end with the part that been left on the screen. It works okay, but it take so much memory, it can take 2gb and more. Can you help me to avoid of using such giant memoryt? Maybe the whole logic wrong and i should try better solution for that?
