graphics

问题 I realized after many years of using and programming computers that the stack of software that actually draws on the screen is mostly a mystery to me. I have worked on some embedded LCD GUI applications and I think that provides some clues as to a simplified stack but the whole picture for something like the Windows operating system is still murky. From what I know: Lowest level 0 is electronic hardware (integrated circuits) that provide a digital interface to turn a pixel on the screen a

问题 I'm trying to create a Voronoi diagram around 2D holes (preferably in PyGame or scipy, but not necessary) and save the edges. It should look something like this: I have been able to use scipy's Voronoi to generate a diagram around points, but I'm not sure how to proceed with 2D obstacles. My code for working with points is: self.vor = Voronoi(POINTS) # iterate over voronoi graph and save edges for vpair in self.vor.ridge_vertices: if vpair[0] >= 0 and vpair[1] >= 0: # vertices v0 = self.vor

问题 I'm trying to create a Voronoi diagram around 2D holes (preferably in PyGame or scipy, but not necessary) and save the edges. It should look something like this: I have been able to use scipy's Voronoi to generate a diagram around points, but I'm not sure how to proceed with 2D obstacles. My code for working with points is: self.vor = Voronoi(POINTS) # iterate over voronoi graph and save edges for vpair in self.vor.ridge_vertices: if vpair[0] >= 0 and vpair[1] >= 0: # vertices v0 = self.vor

问题 I am currently attempting to draw images on the screen at a regular rate like in a video game. Unfortunately, because of the rate at which the image is moving, some frames are identical because the image has not yet moved a full pixel. Is there a way to provide float values to Graphics2D for on-screen position to draw the image, rather than int values? Initially here is what I had done: BufferedImage srcImage = sprite.getImage ( ); Position imagePosition = ... ; //Defined elsewhere g

问题 To finish off my adventure of owner drawing C# controls, my last problem is in a ListView . I have a ListView that will always be in the Detail view mode with two columns - Name and Value. For the Name column, I'll always use DefaultDraw , and for the Value column, I want to bold every match of a search term. My TreeView question and my ComboBox question about owner drawing helped shape the code so far. I don't need any background or border drawing so it is simpler than some of the other

问题 To finish off my adventure of owner drawing C# controls, my last problem is in a ListView . I have a ListView that will always be in the Detail view mode with two columns - Name and Value. For the Name column, I'll always use DefaultDraw , and for the Value column, I want to bold every match of a search term. My TreeView question and my ComboBox question about owner drawing helped shape the code so far. I don't need any background or border drawing so it is simpler than some of the other

问题 I am trying to load a simple cube with per-vertex color information from a Stanford PLY file using QML. My entity looks like this: Entity { id: circle property Material materialPoint: Material { effect: Effect { techniques: Technique { renderPasses: RenderPass { shaderProgram: ShaderProgram { vertexShaderCode: loadSource("qrc:/imports/org/aid/shared/geometry/shaders/point.vert") fragmentShaderCode: loadSource("qrc:/imports/org/aid/shared/geometry/shaders/point.frag") } } } } parameters:

问题 I'm trying to learn how to get a pretty animate graphic using R and gganimate, and I encounter some issue. When I try to animate my graphics, R seems to edit few PNG files, but then fail to render them. Here is an example of the code I use (tidyverse, gganimate, and gifski were loaded first): p <- ggplot(iris, aes(Sepal.Length, Petal.Length)) + geom_point() p + transition_states(Species) R run the first line without issue. When it comes to the second line, console prints "rendering ----> etc.

问题 I'm trying to learn how to get a pretty animate graphic using R and gganimate, and I encounter some issue. When I try to animate my graphics, R seems to edit few PNG files, but then fail to render them. Here is an example of the code I use (tidyverse, gganimate, and gifski were loaded first): p <- ggplot(iris, aes(Sepal.Length, Petal.Length)) + geom_point() p + transition_states(Species) R run the first line without issue. When it comes to the second line, console prints "rendering ----> etc.

问题 This is mostly a follow-up question on a previous one. Given that in ggplot2 and grid there are different linetypes and spacings vary between line sizes, what is their relationship? There are two things I do not quite understand. How is the line size defined? If I were to draw a straight vertical line and substitute it by a rectangle, what should be the width of the rectangle to get the equivalent of the line's size? Especially, how does the lwd = 1 or lwd = 10 I pass to par() / gpar() relate