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PODrag and Drop stage scrolling algorithm problems
 

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    <p>I have some problems with basic drag and drop scrolling algorithm. Here is my algorithm:</p> <ol> <li><p>When mouse pressed down i set boolean dragging = true and store the current mouse x and y position in stored_position variable.</p></li> <li><p>When mouse up i set boolean dragging = false.</p></li> <li><p>On each frame i check dragging == true and if it is i calculate the dx = current_mouse.x - stored_position.x and dy = current_mouse.x - stored_position.y. Then i store current mouse position as the new stored_position and scroll my view (it is 2d camera object) by this dx dy, as the Camera.x -= dx, Camera.y -= dy (i need the inversion one because of camera specific).</p></li> </ol> <p>The problem with this algorithm is that when i drag the camera it starting to blink and move around/shake. I think it is because when i move my mouse from left to right it traces dx like this:</p> <pre><code>71 -67 69 -68 69 -68 8 -5 </code></pre> <p>So i think it is the mouse twitching(i mean the mouse is jumps back sometimes when we try to draw a line). Any idea of changing algorithm, maybe i miss something? Here is example of this problem: <a href="https://dl.dropbox.com/u/78904724/as_host/buld_build_other.rar" rel="nofollow">https://dl.dropbox.com/u/78904724/as_host/buld_build_other.rar</a> (you need to run the index.html chose the level and try to drag the screen).</p> <p><strong>Updated</strong> Here is the example full source link (this is the random picture, i swear): <a href="https://dl.dropbox.com/u/78904724/as_host/scroll_test.rar" rel="nofollow">https://dl.dropbox.com/u/78904724/as_host/scroll_test.rar</a> And this is the code i used (in example i use native flash events instead of using axgl checks to not confuse someone, i have both examples and it cause the same problems):</p> <pre><code> //variables with comments private var dragging:Boolean = false; //dragging flag private var current_mouse:Array; //stored mouse position array [0] - x, [1] - y private var d:Array; //dx dy array [0] - x, [1] - y [Embed(source = "test.jpg")] public static const _sprite:Class; //sprite graphics private var view_sprite:AxSprite; //some image on the stage to drag it //this is the class constructor code view_sprite = new AxSprite(0, 0, _sprite); add(view_sprite); current_mouse = new Array(); d = new Array(); Ax.stage2D.addEventListener(MouseEvent.MOUSE_DOWN, function(e:MouseEvent):void { current_mouse[0] = Ax.mouse.x; current_mouse[1] = Ax.mouse.y; dragging = true; }); Ax.stage2D.addEventListener(MouseEvent.MOUSE_UP, function(e:MouseEvent):void { dragging = false; }); Ax.stage2D.addEventListener(MouseEvent.MOUSE_MOVE, function(e:MouseEvent):void { if (dragging) { d[0] = Ax.mouse.x - current_mouse[0]; d[1] = Ax.mouse.y - current_mouse[1]; Ax.camera.x -= d[0]; Ax.camera.y -= d[1]; current_mouse[0] = Ax.mouse.x; current_mouse[1] = Ax.mouse.y; } }); </code></pre>
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    1. COYou should try fixing up the formatting of your question a bit, but the simplest suggestion I have for the actual problem is to try some type of threshold, if mouse jitter is your issue.
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    2. COCan you post some code?
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      1. USnet.uk.sweet
    3. CO@JPvdMerwe Sorry about formatting, i post it from Android phone and miss the \n. I tried as well, but nothing helps.
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