draw

问题 In the image the red trail is a trail that pygame is creating when I have a bounding rectangle added around sprites. The sprite also does it and the simplest solution was to just clear the surface to black after each redraw. However attempting to do so on the entire main surface is not such a good idea. How can I fix this? 回答1: Normally you will do: def draw(): # fill screen with solid color. # draw, and flip/update screen. But, you can update just dirty portions of the screen. See pygame

问题 I\'m working on a project in which I am trying to make a paint program. So far I\'ve used Netbeans to create a GUI and set up the program. As of right now I am able to call all the coordinated necessary to draw inside it but I am very confused with how to actually paint inside it. Towards the end of my code I have a failed attempt at drawing inside the panel. Can anyone explain/show how to use graphics in a example like this? All examples I have found make a class and extend it with JPanel

问题 I want to draw a Free Hand Polygon on the Map in Google Map V2 . This task was possible with Overlay Map V1 but Google Map has removed that class from V2. (Per this Google Map V2 has Remove Overlay Class). Good Example for Google Map V1 to draw free style polygon. In Map V2, we can draw a polygon programmatically with the help of Google Official Doc but what should a user do? I have found Unclear answer for Map V2 I started with simple Google Map & draw polygon to do this programmatically &

问题 I\'m using this script on the body onmousemove function: function lineDraw() { // Get the context and the canvas: var canvas = document.getElementById(\"myCanvas\"); var context = canvas.getContext(\"2d\"); // Clear the last canvas context.clearRect(0, 0, canvas.width, canvas.height); // Draw the line: context.moveTo(0, 0); context.lineTo(event.clientX, event.clientY); context.stroke(); } It\'s supposed to clear the canvas each time I move the mouse around, and draw a new line, but it isn\'t

问题 I\'ve been busy for a long time finding out how to draw a line between two (GPS) points on the map in HelloMapView but with no luck. Could anyone please tell me how to do so. Suppose I use the HelloMapView which extends MapView. Do I need to use overlays? If so do I have to override the onDraw() method of the overlay and draw a line here? I actually tried these things but with no result. Thank you in advance! 回答1: Thank you for your help. At last I could draw a line on the map. This is how I

问题 I would like to draw a line right in the middle of a layout and use it as a separator of other items like TextView. Is there a good widget for this. I don\'t really want to use an image as it would be hard to match the other components to it. And I want it to be relatively positioned as well. Thanks 回答1: I usually use this code to add horizontal line: <View android:layout_width="match_parent" android:layout_height="1dp" android:background="@android:color/darker_gray"/> To add vertical

问题 I try to draw a rectangular in Java. I set the frame size (800,400) and resizable(false) rectangular\'s x = 50, y = 50 width = 700 height = 300. Why isn\'t it in the middle? Thank you. 回答1: Without any evidence otherwise, I'd guess you've overriden the paint method of something like a JFrame and are painting directly to it. The problem is, frames have decoration (a border and title bar for example), which takes up space inside the frame... Technically, this is correct. The rectangle is