C#: Windows Forms: What could cause Invalidate() to not redraw?
- by Rosarch
I'm using Windows Forms. For a long time, pictureBox.Invalidate(); worked to make the screen be redrawn. However, it now doesn't work and I'm not sure why.
this.worldBox = new System.Windows.Forms.PictureBox();
this.worldBox.BackColor = System.Drawing.SystemColors.Control;
this.worldBox.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
this.worldBox.Location = new System.Drawing.Point(170, 82);
this.worldBox.Name = "worldBox";
this.worldBox.Size = new System.Drawing.Size(261, 250);
this.worldBox.TabIndex = 0;
this.worldBox.TabStop = false;
this.worldBox.MouseMove += new
System.Windows.Forms.MouseEventHandler(this.worldBox_MouseMove);
this.worldBox.MouseDown += new
System.Windows.Forms.MouseEventHandler(this.worldBox_MouseDown);
this.worldBox.MouseUp += new
System.Windows.Forms.MouseEventHandler(this.worldBox_MouseUp);
Called in my code to draw the world appropriately:
view.DrawWorldBox(worldBox, canvas, gameEngine.GameObjectManager.Controllers,
selectedGameObjects, LevelEditorUtils.PREVIEWS);
View.DrawWorldBox:
public void DrawWorldBox(PictureBox worldBox,
Panel canvas,
ICollection<IGameObjectController> controllers,
ICollection<IGameObjectController> selectedGameObjects,
IDictionary<string, Image> previews)
{
int left = Math.Abs(worldBox.Location.X);
int top = Math.Abs(worldBox.Location.Y);
Rectangle screenRect = new Rectangle(left, top, canvas.Width,
canvas.Height);
IDictionary<float, ICollection<IGameObjectController>> layers =
LevelEditorUtils.LayersOfControllers(controllers);
IOrderedEnumerable<KeyValuePair<float,
ICollection<IGameObjectController>>> sortedLayers
= from item in layers
orderby item.Key descending
select item;
using (Graphics g = Graphics.FromImage(worldBox.Image))
{
foreach (KeyValuePair<float, ICollection<IGameObjectController>>
kv in sortedLayers)
{
foreach (IGameObjectController controller in kv.Value)
{
// ...
float scale = controller.View.Scale;
float width = controller.View.Width;
float height = controller.View.Height;
Rectangle controllerRect = new
Rectangle((int)controller.Model.Position.X,
(int)controller.Model.Position.Y,
(int)(width * scale),
(int)(height * scale));
// cull objects that aren't intersecting with the canvas
if (controllerRect.IntersectsWith(screenRect))
{
Image img = previews[controller.Model.HumanReadableName];
g.DrawImage(img, controllerRect);
}
if (selectedGameObjects.Contains(controller))
{
selectionRectangles.Add(controllerRect);
}
}
}
foreach (Rectangle rect in selectionRectangles)
{
g.DrawRectangle(drawingPen, rect);
}
selectionRectangles.Clear();
}
worldBox.Invalidate();
}
What could I be doing wrong here?
