draw | 易学教程

Paint/Draw on top of docked widgets in QDodckWidget

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I have a class in Qt that inherits QDockWidget. And that class contains another widget. Is there any possibility to define a function in my QDockWidget inherited class that draws stuff on top of the contained widget? Like the painting to be independent of the contained widget but to be linked to the inherited class. Thank you Sure it's possible. It is fairly simple to do, in fact. You need to place a child widget that sits on top of everything else in your QDockWidget . To do it so, it must be the last child widget you add to your dockwidget. That widget must not to draw its background, and it

android - adding a String over a Drawable image?

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问题 I'm trying to add a String to a Drawable image. I'm currently not using a Panel to draw and I'd like to keep it that way. Any ideas or do I need to invoke an onDraw() method? My image is showing up with this code: Drawable image = getResources().getDrawable(tile_types[tileType]); setImageDrawable(image); I'd like to add a String over this image. Thanks. 回答1: Sam's answer was my starting point, but the image didn't show up, only the text (I use it on a Google Map). Finally I got it working

Draw text and add to a UIImage iOS 5/6

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I have a textbox, where i want the written text to be added to a UIImage. How can i draw NSString to a UIImage? I´ve searched, and found lots of examples, but non of them works. Xcode just gives me lots of errors. Simply put, i want to draw a NSString to a UIimage. The UIImage should be the same size as a predefined UIImageView, and be placed in center. Any ideas? i think solution is here..i have used this method in one of my application here lbltext is the object of my label. this method creates new image with given text & return the object of new image with text. -(UIImage *) drawText:

How to draw a custom caption bar like the yahoo messenger 11

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问题 As you can see, Y! messenger 11 have used some techniques to draw a beautiful caption bar. Its window's like normal windows in the Win 7 but have a special caption. Is this a glass frame? How can i create one like this?? 回答1: The best reference I know for this is a series of articles by renowned Delphi expert Chris Rolliston. Setting up a custom title bar on Vista/Windows 7 Setting up a custom title bar – reprise 来源： https://stackoverflow.com/questions/8056846/how-to-draw-a-custom-caption-bar

Android: How to fill color to the specific part of the Image only? [duplicate]

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This question already has an answer here: how to fill color in image in particular area? 4 answers I have Image Like this: Now, i want to fill the color to the Specific part of that image. as like If i select color blue and if i touch on Cap then the cap should be fill with the color Blue. Same thing should be also happen with the other part like nose, Mouth, Eyes etc So, How it is possible using android ? Can any budy help me please. Updated I have try with the implementation of the FloodFill algorithm in my app. See Here But after doing that i got exception like: 03-09 17:45:16.260: ERROR

Animate a Canvas circle to draw on load

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OK Hello. I've decided to start using HTML canvas for a small project I have. There's no real start yet. I'm just learning the basics of Canvas and I want to Animate a circle <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>title</title> <style> body { margin: 0px; padding: 0px; background: #222; } </style> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body> <canvas id="myCanvas" width="578" height="250"></canvas> <script> var canvas = document.getElementById('myCanvas'); var context = canvas.getContext('2d'); var x = canvas.width / 2; var y = canvas.height / 2;

How to get total area covered while drawing path on canvas android?

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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); mDrawPaint.setStyle(Paint.Style.STROKE); mDrawPaint.setStrokeJoin(Paint.Join.ROUND); mDrawPaint

How to create MS Paint clone with Python and pygame

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As I see it, there are two ways to handle mouse events to draw a picture. The first is to detect when the mouse moves and draw a line to where the mouse is, shown here . However, the problem with this is that with a large brush size, many gaps appear between each "line" that is not straight since it is using the line's stroke size to create thick lines. The other way is to draw circles when the mouse moves as is shown here . The problem with this is that gaps appear between each circle if the mouse moves faster than the computer detects mouse input. Here's a screenshot with my issues with both

How to draw a graph in PHP? [closed]

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Hey I want to draw a graph(Stdent mark distribution) in my site based on PHP. How can I do this? pChart is another great PHP graphing library. <? # ------- The graph values in the form of associative array $values=array( "Jan" => 110, "Feb" => 130, "Mar" => 215, "Apr" => 81, "May" => 310, "Jun" => 110, "Jul" => 190, "Aug" => 175, "Sep" => 390, "Oct" => 286, "Nov" => 150, "Dec" => 196 ); $img_width=450; $img_height=300; $margins=20; # ---- Find the size of graph by substracting the size of borders $graph_width=$img_width - $margins * 2; $graph_height=$img_height - $margins * 2; $img=imagecreate

How to draw a rectangle around a region of interest in python

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问题 I'm having trouble with import cv in my python code. My issue is I need to draw a rectangle around regions of interest in an image. How can this be done in python? I'm doing object detection and would like to draw a rectangle around the objects I believe I've found in the image. 回答1: please don't try with the old cv module, use cv2: import cv2 cv2.rectangle(img, (x1, y1), (x2, y2), (255,0,0), 2) x1,y1 ------ | | | | | | --------x2,y2 [edit] to append the follow-up questions below: cv2.imwrite