draw

问题 I want to draw a set of disconnected lines on top of an image by dragging the mouse while pressing the left button. However, if I click on a previously drawn line to specify the starting point of the next line, the callback function is not being called and I don't get the point. Here is my code: function main_test S.fH = figure('menubar','none'); im = imread( 'image.jpg' ); S.aH = axes; S.iH = imshow( im ); hold on axis image; X = []; Y = []; set(S.aH,'ButtonDownFcn',@startDragFcn) set(S.iH,

问题 How can I write a program using JES to draw “White” gridlines on an image where the horizontal gridlines are separated by 10 pixels and the vertical gridlines are separated by 20 pixels? 回答1: Yes, surprisingly, addLine(picture, startX, startY, endX, endY) can only draw black lines !? So let's do it by hand. Here is a very basic implementation: def drawGrid(picture, color): w = getWidth(picture) h = getHeight(picture) printNow(str(w) + " x " + str(h)) w_offset = 20 # Vertical lines offset h

问题 I am currently learning java, I understand the concepts except Graphics which as a programmer is totally new to me. Quite frankly it is driving my around the bend. My example should in theory make a circle appear at the press of a Button. Using print methods to debug I keep finding that the Button correctly called all the methods and creates a new circle c object but in the newNode().drawCircle() repaint() is never called and hence the new object not drawn. WHY IS THIS and can someone help me

问题 i am supposed to draw a clock in python without using any modules that need downloading like turtle module, rather id have to use the stddraw module. The clock would also have to give the current time in hours, minutes, and seconds represented on the clock. I am struggling to understand how i'm supposed to go about doing this since i havent done any drawing or anything before so this is really new territory in terms of programming. Any ideas on how to go about doing this or advice is greatly

问题 So I've looked up and only found normal triangles questions out there. This one is a bit tricky. Given a N, your program should create an asterisk unfilled triangle with a N side size. Example 1 Inform N: 1 * Example 2: Inform N: 2 ** * Example 3: Inform N: 3 *** ** * Example 4: Inform N: 4 **** * * ** * Example 5: Inform N: 5 ***** * * * * ** * Here's my attempt, I could only make a filled triangle inefficiently void q39(){ int n,i,b; printf("Inform N: "); scanf ("%i",&n); for ( i = 0; i < n

问题 I'm making a graphical editor, but I am experiencing some problems with the drag & drop over a Panel . The Ellipse doesn't take the exact position where I drop it, and I think it's placed in a UserControl of size 150;150. Here's a link of a short movie to illustrate what I mean: http://gyazo.com/abf5484a31e2d1ce8ebccc49bee9fdb6 In the first part you can see that the Ellipse goes to the wrong position and in the end of the movie when I draw a line it seems that the ellipse has a block around

问题 I'm trying to draw a diversity wheel (a circle with curvilinear rectangles inside) see: circle http://api.ning.com/files/oKZwndeqeam7%2aMiO7f4BDUT%2aAgw3WsK3kW-b-wXjR8gCrCqVAv3RpyBAdi%2adYSLaca0kAYCY0Wk13bSHDnEbOVR1NNUuYotV/diversity_wheel3.JPG?width=500 I know how to draw a circle, but I don't know how to draw the curvilinear rectangle based on the circle coordinates. How can I do this? 回答1: Since you know how to draw circles, just add some lines to its center and you get something like the

问题 So I came across this: mysite/ manage.py mysite/ __init__.py settings.py urls.py wsgi.py and this: root --+---> child1 +---> child2 --+--> subchild1 | +--> subchild2 +---> child3 and was wondering what tool(editor packages/bundle etc) does one use in order to outline and edit such structures easily/programmatically. PS: My preference is towards emacs but for the sake of completeness I will appreciate if other editors/tools were included in the answer. 回答1: The second example is clearly more

问题 I am using floodfill algorithm to fill a black white picture with specific color with user touches. I used this Question to use floodfill algorithm : How to use flood fill algorithm in Android? the problem is sometime(whey i want to fill fast) I get Cannot Generate Texture From Bitmap error and mBitmap.getPixel(x, y) returns 0 and filling will be stop! I can use copyPixelsToBuffer ( pictureBuffer ) instead of getPixel() method According to last post of this link : http://www.developpez.net

问题 I have it so that you can draw under the image, but you must start drawing outside of the image border and move under the image. So you can't start right on the image. How do I fix this? My html is just: <canvas id="canvas"></canvas> <img id="html5" src="http://i.imgur.com/Wpx3Vum.png" style="position:absolute;left:100px;top:15px;" /> 回答1: You can use two canvas elements instead: Put two canvas elements on top of each other Draw the image you want to superimpose on the top canvas Add mouse