I know Win2D allows you to draw text within a specific rectangle and you can set it so that text not within that rectangle is clipped so that it isn't drawn.
I was wondering if it would be possible to do this with not just a rectangle but any Geometry (which may include curved lines)
What I get with rectangular clipping:
What I want (clipping by the white rounded rectangle with the curved bottom):
One of the CreateLayer overloads will probably do what you want:
http://microsoft.github.io/Win2D/html/Overload_Microsoft_Graphics_Canvas_CanvasDrawingSession_CreateLayer.htm
Related
How do i fill some BitmapData image with other image pattern in as 3.0? For example, i have an white image with black square at the center which would be "square:BitmapData" and the other image with little(2x2) blue circle which i would call "circle:BitmapData". I want to fill that square with this blue circles, is there any way to do this?
UPDATE
Here i found the example of what i need to do:
This is two images (left is like my square, right is like the blue circle)
http://pix.samoucka.ru/img/content/graphics/thewebschedule/8/466.gif
And this is how it would look after filling
http://pix.samoucka.ru/img/content/graphics/thewebschedule/8/467.gif
You can try using copyPixels() and iterating though x and y to tile the whole thing, copyPixels() is very fast.
Or
It might be simpler to create a Sprite and use graphics.beginBitmapFill() then graphics.drawRect() with the correct size, then draw() to the BitmapData in the correct position.
If you need to determine the size and position of the black square, getColorBoundsRect() should do the job.
I have started learning CANVAS. After i started drawing some basic shapes, i wanted to make some modifications to them. For example, I am confused of how to modify length and width of rectangle. Should i have to clear the canvas and redraw or can i capture the object of that rectangle like the objects in java script.
The canvas is a raster graphics surface. modifying length and width of a rectangle is a vector action. It is possible to scale a raster, but losses in quality can/will occur. You can use vector graphics in the form of SVG. But if it is only a rectangle, use a div with a border overlay-ed on your canvas.
I have an NSView that is rotated using -setFrameRotation. (This is necessary because the view responds to mouse events, and you don't get correct behavior if you merely draw the view with a rotated NSAffineTransform.)
Given a rect in the rotated view's superview coordinates, how can I determine what portion of the rect intersects the rotated view's frame?
Use case: the Cocoa text system proposes to draw text in a line fragment rectangle. I need to determine how much of that rectangle may be filled with text without overlapping the rotated view.
Take the point, use an affine transform to rotate into the coordinate system of the bounds of the rect and then rect-test that.
I'm using GDI+ in my application, and I need to use a rotated LinearGradientBrush to paint several rects in the exact same way. However, although I'm calling the same code to fill each rect, the results aren't what I expect. Here's the code to create the gradient fill, where rcDraw is the rect containing the area to paint for each rect. These coordinates are in the parent window's coordinates, so they are not identical for the 2 rects.
g_hbrLinear = new LinearGradientBrush( Rect( 0, rcDraw.top, 0, rcDraw.bottom - rcDraw.top ),
clrStart, clrEnd, (REAL) 80, FALSE );
What I see on screen looks like this (http://www.nnanime.com/bugs/LinGradBrush-rotate10.png). You can see that it's as if the fill from the first rect continues into the second one. What I really want is to have the 2 rects look identical. I think I can do that if I paint each rect separately using its own client coordinates, but for the purposes of my app, I need to use the parent window's coordinates.
I guess what I'm asking is, how does GDI+ calculate the "origin" of a fill? Is it always based on 0,0 in the coordinate system you use? Is there a way to shift it? I tried TranslateTransform, but it doesn't seem to shift the fill in a way that I find predictable or understandable.
The rect passed to the linear gradient brush determines the where the left and right colors will sit, and the gradient will be painted within this rectangle.
So, I think you need to create a brush for each rectangle you are painting, where the rectangle you are painting is also passed to the constructor for the linear gradient brush.
My experience with the "transform" of linear gradient brushes matches yours; I haven't been able to understand what it's supposed to do.
You can think of a brush in GDI+ as a function mapping world co-ordinates to a color. What the brush looks like at a given point does not change based on the shape being filled.
It does change with the transform of the Graphics object you're drawing on. So, if you don't want to change the brush, you could temporarily change the transform of the Graphics object so that the rectangle you're drawing has a specific, known size and position in world coordinates. The BeginContainer and EndContainer methods should make this easy.
(There is also the RenderingOrigin property but it only affects hatch brushes, which oddly are unaffected by world transforms.)
My goal is to draw a semi-transparent curve. User moves cursor and I draw the curve under the cursor.
I've tried to use antialiased points to draw line, but I don't know how to make it transparent.
I can't use lines to draw the curve, because can't set both antialiasing and line width.
Should I use triangle strip to draw curve?
Yeah, if you want to do a nice job with this, you could tessellate your wide curve into a triangle strip. There are many papers written about stroke tessellation.
You can then texture your triangle strip with a square alpha texture that has a nice solid, anti-aliased circle in it -- this causes the wide line to appear anti-aliased! Check it out:
http://homepage.mac.com/arekkusu/bugs/invariance/TexAA.html
Very cool stuff.