rasterizing

问题 I have a CSV (value, carbon, latitude, longitude) that I am trying to create a raster from. CSV file sample: Carbon Latitude Longitude coords.x1 coords.x2 1 385 36 74 36 74 2 463 36 74 36 74 3 35 36 74 36 74 4 38 36 74 36 74 5 34 36 74 36 74 6 11 36 74 36 74 7 46 36 74 36 74 8 18 36 74 36 74 9 213 36 74 36 74 10 619 36 74 36 74 11 140 36 74 36 74 12 40 36 74 36 74 13 42 36 74 36 74 14 18 36 74 36 74 15 277 36 74 36 74 16 641 36 74 36 74 17 416 36 74 36 74 18 459 36 74 36 74 19 1073 36 74 36

来源： https://stackoverflow.com/questions/40884680/how-to-use-bresenhams-line-drawing-algorithm-with-clipping

问题 OpenGL pixels/fragments are conceptually 1x1 squares centered on half-integer pixels. The OpenGL 4.5 specification states: A fragment is located by its lower left corner, which lies on integer grid coordinates. Rasterization operations also refer to a fragment’s center, which is offset by (1/2,1/2) from its lower left corner (and so lies on half-integer coordinates). Rasterizers typically assume that pixel centers lie on the integer grid. Since I am attempting to implement a correct OpenGL

问题 Anyone knows how to load a .AI file (Adobe Illustrator) and then rasterize/render the vectors into a Bitmap so I could generate eg. a JPG or PNG from it? I would like to produce thumbnails + render the big version with transparent background in PNG if possible. Ofcause its "possible" if you know the specs of the .AI, but has anyone any knowledge or code to share for a start? or perhaps just a link to some components? C# .NET please :o) Code is most interesting as I know nothing about reading

问题 I'm trying to fix this triangle rasterizer, but cannot make it work correctly. For some reason it only draws half of the triangles. void DrawTriangle(Point2D p0, Point2D p1, Point2D p2) { Point2D Top, Middle, Bottom; bool MiddleIsLeft; if (p0.y < p1.y) // case: 1, 2, 5 { if (p0.y < p2.y) // case: 1, 2 { if (p1.y < p2.y) // case: 1 { Top = p0; Middle = p1; Bottom = p2; MiddleIsLeft = true; } else // case: 2 { Top = p0; Middle = p2; Bottom = p1; MiddleIsLeft = false; } } else // case: 5 { Top =

问题 I have created a whole heap of overlays using MKPolygon and created into a MKPolygonView. This works fine but one of the overlays has a butt load of points (about 800 points) and this causes memory and performance issues. I tried shouldRasterize on the MKPolygonView but this had the opposite affect which I am not surprised. Is there any other thing I can do to increase the performance of it besides lowing the amount of points (which I am in the process of doing)? 回答1: This is an issue that is

问题 I have a shapefile downloaded from the worldwildlife.org for the terrestrial ecoregions of the world. The file can be loaded here: http://worldwildlife.org/publications/terrestrial-ecoregions-of-the-world. It comes as a standard shape file and I would like to do two things with it. First: take the shapefile from my local directory and clip it to an extent of eastern North America (ext= extent (-95, -50, 24, 63)) # Read shapefile using package "maptools" eco_shp <- readShapeLines("F:/01_2013

问题 I have generated a plot like figure; hold; axis([0 10 0 10]); fill([ 1 1 5 5], [5 1 1 5],'b') and now I want to have this plot as an matrix so that I can i.e. filter the blog with a gaussian. Googleing I found this thread Rasterizing Plot to Image at MATLAB Central. I tried it, but I could only get it to work for line or function plots. Do you have any ideas? 回答1: You can use GETFRAME function. It returns movie frame structure, which is actually rasterized figure. Field cdata will contain

问题 i'm thinking about rasterization triangle algorithm. ( triangle_rasterization_lesson ) I wtote the following code: void triangle(int xa, int ya, int xb, int yb, int xc, int yc, TGAImage &image, TGAColor color) { line(xa, ya, xb, yb, image, color); line(xa, ya, xc, yc, image, color); line(xb, yb, xc, yc, image, color); for (int x = xa; x<=xb; x++) { for (int y = ya; y<=yb; y++) { line(xc, yc, x, y, image, white); } } } With triangle(100, 100, 100, 400, 400, 100, image, red); it works properly.

问题 I want to map textures with correct perspective for 3D rendering. I am using barycentric coordinates to locate points on the faces of triangles. Simple affine transformation gave me that standard, weird looking result. This is what I did to correct my perspective, but it seems to have only made the distortion greater: three triangle vertices v1 v2 v3 vertex coordinates are v_.x v_.y v_.z texture coordinates are v_.u v_.v barycentric coordinates corresponding to vertices are b1 b2 b3 I am