draw

问题 Is there any way to draw an NSImage like images in NSButtons or other cocoa interface elements? Here are examples: Apple uses pdf's with black icons: 回答1: If you simply want this effect to be applied when you use your own images in a button, use [myImage setTemplate:YES] . There is no built-in way to draw images with this effect outside of a button that has the style shown in your screenshots. You can however replicate the effect using Core Graphics. If you look closely, the effect consists

问题 Updated - this is related with the following link I posted yesterday. https://stackoverflow.com/questions/15916360/swing-gui-application-in-java-with-multiple-frames I apologize if I am doing something wrong here, I tried to write in my previous post and I couldn't find a way to do it beyond the comments box. I did some changes on my code, now I am working with 3 JPanels. I created a class for each panel except the main one that will hold in a CardLayout the other two. The main panel is

问题 I have to draw line as the mouse moves, after the mouse click, the line should be continued to draw until double clicked. Say point A, point B and point C. when mouse clicked at point A, the drawing of line should be started. when mouse is clicked on point B, the prev line should be there along with that new line should be started drawing from point B unless double clicked. Should be the same for point C and so on until the mouse is double clicked. After some research, I have written below

问题 I am an avid programmer but today is my first Java lesson. public void Paint (Graphics g) { if(g instanceof Graphics2D) { Graphics2D g2d = (Graphics2D)g; g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON); } g.drawString("This is gona be awesome", 200, 200); } With the above code, I want to write a sentence on the window but it never writes. What am I doing wrong? Edit: Never mind - Paint must be paint. I apologize profusely. 回答1: In the given

问题 I have a 2D numpy array containing the individual data from each pixel of a sensor. The image is displayed in a GUI with a live feed from the camera. I want to be able to draw a rectangle over the image in order to distinguish an area of the screen. It seems pretty simple to draw a rectangle which is parallel to the side of the image but I eventually want to be able to rotate the rectangle. How will I know which pixels the rectangle covers when it is rotated? 回答1: You can use the Python

问题 I have a line of code here that uses the python binding for opencv: cv2.rectangle(img, (box[1], box[0]), (box[3], box[2]), (255,0,0), 4) This draws a red rectangle on image img of thickness 4 . But is there a way the lines of the rectangles can be stylized? Not too much. Just dotted, or dashed, that's it really. 回答1: import cv2 import numpy as np def drawline(img,pt1,pt2,color,thickness=1,style='dotted',gap=20): dist =((pt1[0]-pt2[0])**2+(pt1[1]-pt2[1])**2)**.5 pts= [] for i in np.arange(0

问题 How can i draw a polygon according to the input coordinates which are given in C#. 回答1: You didn't show any code because based on those coordinate, you are applying some form of scaling to the image. Using the Paint event of a PictureBox, here is an example using those coordinates on the screen. It fills in the polygon, then draws the border, then it loops through all the points to draw the red circle: void pictureBox1_Paint(object sender, PaintEventArgs e) { e.Graphics.SmoothingMode =

问题 Im using below code to draw line on bitmap canvas while finger touch move... here i posted partial code and it is working fine.. As shown in below image, the black and white bitmap erased on touch drag.. I made canvas transparent so the parent layout background(color image) is getting visible. I want to know , how much area is erased(like 50% or 60% of bitmap ).. is there any way to find that? //Erasing paint mDrawPaint = new Paint(); mDrawPaint.setAntiAlias(true); mDrawPaint.setDither(true);

问题 I know how to draw a arc and I also found how to draw a gradient line from here I have found two function can draw gradient:CGContextDrawLinearGradient and CGContextDrawRadialGradient.but how can I draw a gradient arc? I want to realize like this picture: 回答1: I spent a long time searching for how to do this, too, so I thought I'd post the way I ended up doing it. It turns out both answers are in the excellent answer to this question: Draw segments from a circle or donut For my purposes, I

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 years ago . Hey I want to draw a graph(Stdent mark distribution) in my site based on PHP. How can I do this? 回答1: pChart is another great PHP graphing library. 回答2: <? # ------- The graph values in the form of associative array $values=array( "Jan" => 110, "Feb" => 130, "Mar" => 215, "Apr" =>