I want to be able to draw images to the viewport in my 3d Max Plugin,
The GraphicsWindow Class has functions for drawing 3d objects in the viewport but these drawing calls are limited by the current viewport and graphics render limits.
This is undesirable as the image I want to draw should always be drawn no matter what graphics mode 3d max is in and or hardware is used, futher i am only drawing 2d images so there is no need to draw it in a 3d context.
I have managed to get the HWND of the viewport and the max sdk has the function
DrawIconButton();
and i have tried using this function but it does not function properly, the image flickers randomly with user interaction, but disappears when there is no interactivity.
i Have implemented this function in the
RedrawViewsCallback function, however the DrawIconButton() function is not documented and i am not sure if this is the correct way to implemented it.
Here is the code i am using to draw the image:
void Sketch_RedrawViewsCallback::proc (Interface * ip)
{
Interface10* ip10 = GetCOREInterface10();
ViewExp* viewExp = ip10->GetActiveViewport();
ViewExp10* currentViewport;
if (viewExp != NULL)
{
currentViewport = reinterpret_cast<ViewExp10*>(viewExp->Execute(ViewExp::kEXECUTE_GET_VIEWEXP_10));
} else {
return;
}
GraphicsWindow* gw = currentViewport->getGW();
HWND ViewportWindow = gw->getHWnd();
HDC hdc = GetDC(ViewportWindow);
HBITMAP bitmapImage = LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_BITMAP1));
Rect rbox(IPoint2(0,0),IPoint2(48,48));
DrawIconButton(hdc, bitmapImage, rbox, rbox, true);
ReleaseDC(ViewportWindow, hdc);
ip->ReleaseViewport(currentViewport);
};
I could not find a way to draw directly to the view-port window, however I have solved the problem by using a transparent modeless dialog box.
May be a complete redraw will solve the issue. ForceCompleteRedraw
Related
I have a simple Xamarin Forms page that contains a SkiaSharp Canvas. I am allowing the user to load a floor plan bitmap to use as the background for the Canvas, and they can add smaller bitmaps to be dragged around the canvas where they need.
I am following this guidance on the Microsoft page for touch manipulation.
https://learn.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/graphics/skiasharp/transforms/touch
Everything works perfectly if I use it on a single device size. When I launch it on a different device size, the resolution and Canvas size are different, and it is causing the smaller bitmaps to be placed inconsistently.
Here is the result I am seeing. The left is an iPhone 13 Pro Max, and the right is a iPhone 13 Pro. As you can see, the result is off when I view it on different size devices.
Here is the Grid that contains the SKCanvas:
<Grid BackgroundColor="White" Grid.Row="1">
<skia:SKCanvasView x:Name="canvasView" PaintSurface="OnCanvasViewPaintSurface" />
<Grid.Effects>
<tt:TouchEffect Capture="True" TouchAction="OnTouchEffectAction" />
</Grid.Effects>
</Grid>
Here is the PaintSurface handler:
void OnCanvasViewPaintSurface(object sender, SKPaintSurfaceEventArgs args)
{
SKImageInfo info = args.Info;
SKSurface surface = args.Surface;
SKCanvas canvas = surface.Canvas;
canvas.Clear();
//set background
SKRect dest = new SKRect(0, 0, info.Width, info.Height);
canvas.DrawBitmap(backgroundBitmap, dest, BitmapStretch.Uniform,
BitmapAlignment.Start, BitmapAlignment.Start);
//Set the coordinates for the pin bitmap
var transX = 1005;
var transY = 1189;
bitmap.Matrix = SKMatrix.CreateTranslation(transX, transY);
// Display the bitmap
bitmap.Paint(canvas);
// Display the matrix in the lower-right corner
SKSize matrixSize = matrixDisplay.Measure(bitmap.Matrix);
matrixDisplay.Paint(canvas, bitmap.Matrix,
new SKPoint(info.Width - matrixSize.Width,
info.Height - matrixSize.Height));
}
I've been through several posts on StackOverflow as well as in MS forums. I can't figure out a way to make this show consistently on different size devices.
Does anyone have a suggestion on how I can keep this smaller bitmap in the same location on the background/SKCanvas regardless of device size?
I appreciate any feedback.
The coordinate of the bitmap is not supposed to be hard-coded , you need to adjust the value (x/y) according to the background canvas's size.
Something like this
var transX = info.Width - 20;
var transY = info.Height - 20;
I'm using the Embarcadero RAD Studio C++ builder XE7 compiler. In an application project, I'm using the both Windows GDI and GDI+ to draw on several device contexts.
My drawing content is something like that:
On the above sample the text background and the user picture are drawn with GDI+. The user picture is also clipped with a rounded path. All the other items (the text and the emojis) are drawn with the GDI.
When I draw to the screen DC, all works fine.
Now I want to draw on a printer device context. Whichever I use for my tests is the new "Export to PDF" printer device available in Windows 10. I prepare my device context to draw on an A4 viewport this way:
HDC GetPrinterDC(HWND hWnd) const
{
// initialize the print dialog structure, set PD_RETURNDC to return a printer device context
::PRINTDLG pd = {0};
pd.lStructSize = sizeof(pd);
pd.hwndOwner = hWnd;
pd.Flags = PD_RETURNDC;
// get the printer DC to use
::PrintDlg(&pd);
return pd.hDC;
}
...
void Print()
{
HDC hDC = NULL;
try
{
hDC = GetPrinterDC(Application->Handle);
const TSize srcPage(793, 1123);
const TSize dstPage(::GetDeviceCaps(hDC, PHYSICALWIDTH), ::GetDeviceCaps(hDC, PHYSICALHEIGHT));
const TSize pageMargins(::GetDeviceCaps(hDC, PHYSICALOFFSETX), ::GetDeviceCaps(hDC, PHYSICALOFFSETY));
::SetMapMode(hDC, MM_ISOTROPIC);
::SetWindowExtEx(hDC, srcPage.Width, srcPage.Height, NULL);
::SetViewportExtEx(hDC, dstPage.Width, dstPage.Height, NULL);
::SetViewportOrgEx(hDC, -pageMargins.Width, -pageMargins.Height, NULL);
::DOCINFO di = {sizeof(::DOCINFO), config.m_FormattedTitle.c_str()};
::StartDoc (hDC, &di);
// ... the draw function is executed here ...
::EndDoc(hDC);
return true;
}
__finally
{
if (hDC)
::DeleteDC(hDC);
}
}
The draw function executed between the StartDoc() and EndDoc() functions is exactly the same as whichever I use to draw on the screen. The only difference is that I added a global clipping rect on my whole page, to avoid the drawing to overlaps on the page margins when the size is too big, e.g. when I repeat the above drawing several times under the first one. (This is experimental, later I will add a page cutting process, but this is not the question for now)
Here are my clipping functions:
int Clip(const TRect& rect, HDC hDC)
{
// save current device context state
int savedDC = ::SaveDC(hDC);
HRGN pClipRegion = NULL;
try
{
// reset any previous clip region
::SelectClipRgn(hDC, NULL);
// create clip region
pClipRegion = ::CreateRectRgn(rect.Left, rect.Top, rect.Right, rect.Bottom);
// select new canvas clip region
if (::SelectClipRgn(hDC, pClipRegion) == ERROR)
{
DWORD error = ::GetLastError();
::OutputDebugString(L"Unable to select clip region - error - " << ::IntToStr(error));
}
}
__finally
{
// delete clip region (it was copied internally by the SelectClipRgn())
if (pClipRegion)
::DeleteObject(pClipRegion);
}
return savedDC;
}
void ReleaseClip(int savedDC, HDC hDC)
{
if (!savedDC)
return;
if (!hDC)
return;
// restore previously saved device context
::RestoreDC(hDC, savedDC);
}
As mentioned above, I expected a clipping around my page. However the result is just a blank page. If I bypass the clipping functions, all is printed correctly, except that the draw may overlap on the page margins. On the other hands, if I apply the clipping on an arbitrary rect on my screen, all works fine.
What I'm doing wrong with my clipping? Why the page is completely broken when I enables it?
So I found what was the issue. Niki was close to the solution. The clipping functions seem always applied to the page in pixels, ignoring the coordinate system and the units defined by the viewport.
In my case, the values passed to the CreateRectRgn() function were wrong, because they remained untransformed by the viewport, although the clipping was applied after the viewport was set in the device context.
This turned the identification of the issue difficult, because the clipping appeared as transformed while the code was read, as it was applied after the viewport, just before the drawing was processed.
I don't know if this is a GDI bug or a wished behavior, but unfortunately I never seen this detail mentioned in all the documents I read about the clipping. Although it seems to me important to know that the clipping isn't affected by the viewport.
I'm having an issue using Pixi.js, where the lineTo method seems to draw lines that aren't specified. The bad lines aren't uniform width (seem to taper off towards the ends) and are much longer than they should be. Example jsfiddle showing the problem here:
http://jsfiddle.net/b1e48upd/1/
var stage, renderer;
function init() {
stage = new PIXI.Stage(0x001531, true);
renderer = new PIXI.WebGLRenderer(800, 600);
// renderer = new PIXI.CanvasRenderer(400, 300);
document.body.appendChild(renderer.view);
requestAnimFrame( animate );
graphics = new PIXI.Graphics();
stage.addChild(graphics);
graphics.beginFill(0xFF0000);
graphics.lineStyle(3, 0xFF0000);
graphics.moveTo(200, 200);
graphics.lineTo(192, 192);
graphics.lineTo(198, 183);
graphics.lineTo(189, 197);
}
function animate() {
requestAnimFrame( animate );
renderer.render(stage);
}
init();
Using the canvas renderer gives correct results.
Trying to search for this problem, I've gathered that the WebGL renderer may have an issue with non-integer values (shown in the question here: Pixi.js lines are rendered outside dedicated area), and I've also seen that sending consecutive lineTo commands to the same coordinates will cause issues, but my example doesn't have either of those.
I was thinking of making a windows form with a 50x50 space somewhere on it (bitmap?) and having the user draw (like MS Paint) inside the square. When the user is done, the picture can be saved by clicking on the "save" button and it will be updated in Game1 (for collision purposes of my game). I've seen some tutorials on here on how to draw on screen like MS Paint, but I can't seem to figure out how to SAVE that picture as a Texture2D/Rectangle. And how do I get a bitmap onto a windows form?
To save a bitmap as a png:
private void SaveBmpAsPNG(Bitmap bm)
{
bm.Save(#"c:\button.png", ImageFormat.Png);
}
To write a texture2d to a file:
using (Stream stream = File.OpenWrite("picture.png"))
{
texture.SaveAsPng(stream, texture.Width, texture.Height);
}
To read a .png into a texture2d:
using(Stream stream = File.OpenRead("picture.png"))
{
texture = Texture2D.FromStream(GraphicsDevice, stream);
}
So I have this Panel class. It's a little like a Window where you can resize, close, add buttons, sliders, etc. Much like the status screen in Morrowind if any of you remember. The behavior I want is that when a sprite is outside of the panel's bounds it doesn't get drawn and if it's partially outside only the part inside gets drawn.
So what it does right now is first get a rectangle that represents the bounds of the panel, and a rectangle for the sprite, it finds the rectangle of intersection between the two then translates that intersection to the local coordinates of the sprite rectangle and uses that for the source rectangle. It works and as clever as I feel the code is I can't shake the feeling that there's a better way to do this. Also, with this set up I cannot utilize a global transformation matrix for my 2D camera, everything in the "world" must be passed a camera argument to draw. Anyway, here's the code I have:
for the Intersection:
public static Rectangle? Intersection(Rectangle rectangle1, Rectangle rectangle2)
{
if (rectangle1.Intersects(rectangle2))
{
if (rectangle1.Contains(rectangle2))
{
return rectangle2;
}
else if (rectangle2.Contains(rectangle1))
{
return rectangle1;
}
else
{
int x = Math.Max(rectangle1.Left, rectangle2.Left);
int y = Math.Max(rectangle1.Top, rectangle2.Top);
int height = Math.Min(rectangle1.Bottom, rectangle2.Bottom) - Math.Max(rectangle1.Top, rectangle2.Top);
int width = Math.Min(rectangle1.Right, rectangle2.Right) - Math.Max(rectangle1.Left, rectangle2.Left);
return new Rectangle(x, y, width, height);
}
}
else
{
return null;
}
}
and for actually drawing on the panel:
public void DrawOnPanel(IDraw sprite, SpriteBatch spriteBatch)
{
Rectangle panelRectangle = new Rectangle(
(int)_position.X,
(int)_position.Y,
_width,
_height);
Rectangle drawRectangle = new Rectangle();
drawRectangle.X = (int)sprite.Position.X;
drawRectangle.Y = (int)sprite.Position.Y;
drawRectangle.Width = sprite.Width;
drawRectangle.Height = sprite.Height;
if (panelRectangle.Contains(drawRectangle))
{
sprite.Draw(
spriteBatch,
drawRectangle,
null);
}
else if (Intersection(panelRectangle, drawRectangle) == null)
{
return;
}
else if (Intersection(panelRectangle, drawRectangle).HasValue)
{
Rectangle intersection = Intersection(panelRectangle, drawRectangle).Value;
if (Intersection(panelRectangle, drawRectangle) == drawRectangle)
{
sprite.Draw(spriteBatch, intersection, intersection);
}
else
{
sprite.Draw(
spriteBatch,
intersection,
new Rectangle(
intersection.X - drawRectangle.X,
intersection.Y - drawRectangle.Y,
intersection.Width,
intersection.Height));
}
}
}
So I guess my question is, is there a better way to do this?
Update: Just found out about the ScissorRectangle property. This seems like a decent way to do this; it requires a RasterizerState object to be made and passed into the spritebatch.Begin overload that accepts it. Seems like this might be the best bet though. There's also the Viewport which I can apparently change around. Thoughts? :)
There are several ways to limit drawing to a portion of the screen. If the area is rectangular (which seems to be the case here), you could set the viewport (see GraphicsDevice) to the panel's surface.
For non-rectangular areas, you can use the stencil buffer or use some tricks with the depth buffer. Draw the shape of the surface in the stencil buffer or the depth buffer, set your render state to draw only pixels located in the shape you just rendered in the stencil/depth buffer, finally render your sprites.
One way of doing this is simple per-pixel collision. Although this is a bad idea if the sprites are large or numerous, this can be a very easy and fast way to get the job done with small sprites. First, do a bounding circle or bounding square collision check against the panel to see if you even need to do per-pixel detection.
Then, create a contains method that checks if the position, scale, and rotation of the sprite put it so far inside the panel that it must be totally enclosed by the panel, so you don't need per-pixel collision in that case. This can be done pretty easily by just creating a bounding square that has the width and height of the length of the sprite's diagonal, and checking for collision with that.
Finally, if both of these fail, we must do per-pixel collision. Go through and check against every pixel in the sprite to see if it is within the bounds of the panel. If it isn't set the alpha value of the pixel to 0.
Thats it.