Not really an answer (as the code will be rewritten anyway) so few hints for the new code instead (some of them are already mentioned in the comments). Tileset In the final isometric engine use sprites. They are faster and support pixel art. For my purposes I use compilation of these two free to use … Read more
Here is my version for a 2D histogram: %# some random data X = randn(2500,1); Y = randn(2500,1)*2; %# bin centers (integers) xbins = floor(min(X)):1:ceil(max(X)); ybins = floor(min(Y)):1:ceil(max(Y)); xNumBins = numel(xbins); yNumBins = numel(ybins); %# map X/Y values to bin indices Xi = round( interp1(xbins, 1:xNumBins, X, ‘linear’, ‘extrap’) ); Yi = round( interp1(ybins, 1:yNumBins, … Read more
The original poster wanted to DETECT an intersection between a line segment and a polygon. There was no need to LOCATE the intersection, if there is one. If that’s how you meant it, you can do less work than Liang-Barsky or Cohen-Sutherland: Let the segment endpoints be p1=(x1 y1) and p2=(x2 y2). Let the rectangle’s … Read more
Don’t forget that you don’t need to bother with the square root. If you just want to find the nearest one (and not it’s actual distance) just use dx^2 + dy^2, which will give you the distance squared to the each item, which is just as useful. If you have no data structure wrapping this … Read more
You can do this: Paint paint = new Paint(); final RectF rect = new RectF(); //Example values rect.set(mWidth/2- mRadius, mHeight/2 – mRadius, mWidth/2 + mRadius, mHeight/2 + mRadius); paint.setColor(Color.GREEN); paint.setStrokeWidth(20); paint.setAntiAlias(true); paint.setStrokeCap(Paint.Cap.ROUND); paint.setStyle(Paint.Style.STROKE); canvas.drawArc(rect, -90, 360, false, paint); The key is in paint.setStyle(Paint.Style.STROKE);, it crops the arc’s center with the stroke that you define in … Read more
If you use a Camera (which you should) changing the coordinate system is pretty simple: camera= new OrthographicCamera(Gdx.graphics.getWidth(), Gdx.graphics.getHeight()); camera.setToOrtho(true, Gdx.graphics.getWidth(), Gdx.graphics.getHeight()); If you use TextureRegions and/or a TextureAtlas, all you need to do in addition to that is call region.flip(false, true). The reasons we use y-up by default (which you can easily change as … Read more
You can just declare a regular array like so: var arry = []; Then when you have a pair of values to add to the array, all you need to do is: arry.push([value_1, value2]); And yes, the first time you call arry.push, the pair of values will be placed at index 0. From the nodejs … Read more
I solved the equations for you: k = ((y2-y1) * (x3-x1) – (x2-x1) * (y3-y1)) / ((y2-y1)^2 + (x2-x1)^2) x4 = x3 – k * (y2-y1) y4 = y3 + k * (x2-x1) Where ^2 means squared
Using the Graphics2D rotation method is indeed the easiest way. Here’s a simple implementation: int centerX = width / 2; int centerY = height / 2; double angle = Math.atan2(centerY – mouseY, centerX – mouseX) – Math.PI / 2; ((Graphics2D)g).rotate(angle, centerX, centerY); g.fillRect(…); // draw your rectangle If you want to remove the rotation when … Read more
It’s not simple really. The line: var arr : [[Int]] = [] Creates a variable of type Array of Array of Int and initially the array is empty. You need to populate this like any other other array in Swift. Let’s step back to a single array: var row : [Int] = [] You now … Read more