graphics

问题 I'm trying to trim a Bitmap based on white pixels. I'd like to do it efficiently, so I'm avoiding using .GetPixel I'm implementing the marked-correct answer from this question. In the answer, they detect whether pixels in a byte array are transparent. I would like to detect whether the pixels are white instead, with a threshold (so if it is less white than a threshold then foundPixel=true; . I've extracted the relevant code here: static Bitmap TrimBitmap(Bitmap source) { BitmapData data =

问题 I recently got a new macbook pro (2020 13-inch, running Big Sur v 11.1) and am using Rstudio (V 1.3.1093 with R version 4.0.3). On my old computer, I often used the quartz() function to view my plots in the external graphics viewer. On my old mac, this would allow me to dynamically resize, keep fonts consistent, save directly from the resized version, etc. Now, on my new computer, it is behaving... strangely. For example, when I run quartz() and a window opens, then I run a ggplot , the

问题 So the official documentation says: Note that the node transform is the local transform of the node relative to the joint, like any other node in the glTF node hierarchy as described in the Transformation section. I am a bit fuzzy as to what exactly the distinction is between node and joint here. Assuming I can conflate the 2, go to the SimpleSkin exmaple int the models And look at the json: "nodes" : [ { "skin" : 0, "mesh" : 0 }, { "children" : [ 2 ], "translation" : [ 0.0, 1.0, 0.0 ] }, {

问题 I have the following code (although without data, sadly): detrend_plot <- cbind(l_p_lng,l_vol_lng,l_p_oil,l_rgdpe, ldiff_p_lng,ldiff_vol_lng,ldiff_p_oil,ldiff_rgdpe) plot.ts(detrend_plot, main="",) which gives the following plot: What I want to do is to add custom titles, individual y-axis labels, and x-axis labels. I know that this is possible using GGPLOT , although my knowledge of it is sparse. Has anyone encountered a similar problem? I don't think this is possible using the regular plot

问题 I want to create a 2D plane centered on 0,0,0 in 3D world space. Then, I want to define this plane in 2d tile coordinates. So e.g. a plane divided by 3 tiles would become a map of an array [3,3] The issue is that this would still give a tilemap with negative points. The world upper left -1,1 would be 0,0 in the array -1,- would be 1,0 and so on... World: -1,1 0,1 1,1 -1,0 0,0 1,0 -1,-1 0,-1 1,-1 Array: 0,0 0,1 0,2 1,0 1,1 1,2 2,0 2,1 2,2 My main hope with Unity was that I could avoid the math

问题 I need to fit my text to image. My image have different sizes so i can't set constant pointsize. My command looks something like this convert -fill white -font Winter Calligraphy -size `${options.width}x${options.height}` label: KJHGFD test.gif on output you can see cropped part on top of picture. Output: I have problem only with this fonts, other fonts works great. I tried to add white border on top. Unfortunately, this only moved the damaged text to bottom. I can't change area size. Text

问题 I'm learning about more quaternion conversions and I have a question regarding quaternion to spherical rotation conversion code at the following section of this website: http://web.archive.org/web/20041029003853/http://www.j3d.org/matrix_faq/matrfaq_latest.html#Q59 What are angle and sin_angle in this code supposed to be? Angle is never used so I was guessing it's the rotation angle. Is sin_angle supposed to be sin_a? If this was a function returning an array of float with the spherical

问题 I am using the HTML5 canvas API to draw a tile map for a pixel art game. The rendered tile map is comprised of many smaller images that are cut out of a single source image called a tile sheet. I am using drawImage(src_img, sx, sy, sw, sh, dx, dy, dw, dh) to cut the individual tiles out of the source image and draw them onto the destination canvas. I am using setTransform(sx, 0, 0, sy, tx, ty) to apply scale and translation to the final rendered image. The color "bleeding" issue I need to fix

问题 Is it possible to turn off ANTIALIAS in JLabel ? Something like this (but it is not working..): @Override public void paintComponent(Graphics g) { Graphics2D graphics2d = (Graphics2D) g; graphics2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_OFF); super.paintComponent(g); } } Or should I create custom Label where I can easily set this ANTIALIAS value? The goal is to make the text not fuzzy. 回答1: Found the solution (first lines when application

问题 I've been battling a bit (or a lot) with Java's Graphics, I've been going through the documentation and tutorials for drawing Java Graphics. Every example I've found seems to have a main class that extends a JPanel and then calls itself which executes the paint function somehow. Is it possible to draw graphics without using extends at all? I have a basic program import javax.swing.*; import awt.Graphics; public class basicWindow { public static void main(String[] args) { JFrame frame = new