draw | 易学教程

Draw two parallel line using CAShape Layer

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问题 I am drawing single line by CAShapeLayer *lineShape = nil; CGMutablePathRef linePath = nil; linePath = CGPathCreateMutable(); lineShape = [CAShapeLayer layer]; lineShape.lineWidth = 1.0f; lineShape.lineCap = kCALineJoinMiter; lineShape.strokeColor = [[UIColor redColor] CGColor]; CGPathMoveToPoint(linePath, NULL, x, y); CGPathAddLineToPoint(linePath, NULL, toX, toY); lineShape.path = linePath; CGPathRelease(linePath); [myView.layer addSublayer:lineShape]; i want to draw a parallel line to this

Coloring nodes with RGB pixel values in networkX.draw() : ValueError: c of shape (16, 3) not acceptable as a color sequence

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问题 l randomly generated a graph of 16 nodes. Each nodes take a clor : red,blue or green. Here is my code : G= nx.watts_strogatz_graph(16, 2, 0, seed=seed) color = ['red', 'blue', 'green'] x = G.nodes() l = len(x) color_gen = choices(color, k=l) node_positions = nx.spring_layout(G, scale=100) nx.draw(G, pos=node_positions, node_color=color_gen, with_labels=True) such that color_gen represents the color of each node : ['red', 'blue', 'blue', 'red', 'green', 'blue', 'green', 'blue', 'red', 'green',

UML modelling tool for php

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问题 My question is what do you use when you create large scale php applications. I havent found so far a decent UML modelling tools which would have these features: nice GUI adding attributes and methods by click (no like big edit with raw text and new lines) generate php classes drag and drop classes for modelling databases I use MySQL workbench and it is really god for what I need to do. thanks. 回答1: You could give UML Lab (http://uml-lab.com) a try (Note: I'm biased as I'm working for Yatta

How to draw selection box on SWT canvas?

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问题 I have an SWT Canvas with some image on it. I want my user to select parts of the image by clicking, holding the left mouse button and opening a selection box by moving the mouse. As a visual feedback I want to show the selected rectangle as a transparent overlay over my image. The problem is I have not clue how to best achieve this? Can someone give me a hint? 回答1: My answer is somehow similar to the one I gave here: SWTChart mouse event handling The code below should give you an idea on

ExtTextOut fails with very long strings unless lower font quality specified

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问题 Sometimes our application needs to draw very long strings (e.g. 6,000 chars) using ExtTextOut. Sometimes ExtTextOut fails and returns zero and GetLastError returns zero as well. To re-create the situation create a simple MFC Single Document application and then set the OnDraw to be: void CTestExtTextView::OnDraw(CDC* pDC) { CTestExtTextDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); if (!pDoc) return; LOGFONT lfDetail = {0}; lfDetail.lfHeight = -(::MulDiv(100, pDC->GetDeviceCaps(LOGPIXELSY),

Draw letter(text) with UIBezierPath single line

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问题 I am using this and this for reference. I am new for using UIBezierPath, and i want to draw path on character(letter) code i am using is as follow. CGMutablePathRef letters = CGPathCreateMutable(); CTFontRef font = CTFontCreateWithName(CFSTR("Courier New"), 200.0f, NULL); NSDictionary *attrs = [NSDictionary dictionaryWithObjectsAndKeys:CFBridgingRelease(font), kCTFontAttributeName,nil]; NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:@"B" attributes:attrs];

Draw two parallel line using CAShape Layer

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I am drawing single line by CAShapeLayer *lineShape = nil; CGMutablePathRef linePath = nil; linePath = CGPathCreateMutable(); lineShape = [CAShapeLayer layer]; lineShape.lineWidth = 1.0f; lineShape.lineCap = kCALineJoinMiter; lineShape.strokeColor = [[UIColor redColor] CGColor]; CGPathMoveToPoint(linePath, NULL, x, y); CGPathAddLineToPoint(linePath, NULL, toX, toY); lineShape.path = linePath; CGPathRelease(linePath); [myView.layer addSublayer:lineShape]; i want to draw a parallel line to this line . Any idea or calculation? or is there any code for getting touch point of this particular line .

How to draw line between two nodes placed in different Panes / Regions

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问题 I am tryin to draw a genealogy tree. In my tree, I store information about ex partners. So the Panel (Region) for person shoud looking like this Z * * * Z * * * Z * * * X --- Y Where Z represent exPartner, X represent Persion and Y represent current Wife / Husband And now I would like to draw line to connect current relation with children. And ec relations with children. (graphicaly there will be a line beetwen Z and *) But when the person is in the other region LayoutX and LayoutX property

How to create Paint-like app with XNA?

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问题 The issue of programmatically drawing lines using XNA has been covered here. However, I want to allow a user to draw on a canvas as one would with a drawing app such as MS Paint. This of course requires each x and/or y coordinate change in the mouse pointer position to result in another "dot" of the line being drawn on the canvas in the crayon color in real time. In the mouse move event, what XNA API considerations come into play in order to draw the line point by point? Literally, of course,

How to Draw in fragment?

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问题 I have created Actionbar for my app with viewpager and it works properly. Now I want to draw some objects on each fragment. Can anyone suggest a good tutorial or sample code on how to draw on fragment. I can draw objects on my view when myclass extends Activity but I don't know what to do when it extends Fragment. I have tried this code till now but it does not work public class MoviesFragment extends Fragment { ImageView imageView; Bitmap bitmap; Bitmap bit; Canvas canvas; Paint paint;