2d

I can draw my map according to the formula on Drawing Isometric game worlds . But how can i find the x-y of one tile according to it's position on map layer div? For being clear, my tile's left style is 1036px and top style is 865px. According to those css properties how can find the tile's x and y position according to map? Tile width is 200 and height is 100. Many Thanks. My javascript code is like that: this.drawTiles = function(min_x, max_x, min_y, max_y) { if (min_x < 0) min_x = 0; if (min_y < 0) min_y = 0; if (max_x < 0) max_x = thisObj.MAXSIZE; if (max_y < 0) max_y = thisObj.MAXSIZE; if

This is over my head, can someone explain it to me better? http://mathworld.wolfram.com/Reflection.html I'm making a 2d breakout fighting game, so I need the ball to be able to reflect when it hits a wall, paddle, or enemy (or a enemy hits it). all their formula's are like: x_1^'-x_0=v-2(v·n^^)n^^. And I can't fallow that. (What does ' mean or x_0? or ^^?) The formula for reflection is easier to understand if you think to the geometric meaning of the operation of "dot product". The dot product between two 3d vectors is mathematically defined as <a, b> = ax*bx + ay*by + az*bz but it has a nice

Hope anyone can shed light on this so I can use pens with dash patterns? I am writing a scrollable chart (a Panel inside ScrollViewer that implements IScrollInfo ) in WPF using DrawingVisual 's DataContext.Draw X . I have several thousand DrawingVisual s that get scrolled by using TranslateTransform on the Panel that hosts them. I implemented a grid by placing a Panel on top of it and drawing simple horizontal lines from one edge to the other using DataContext.DrawLine(pen, new Point(0, y), new Point(widthOfPanel, y)); //(note: these lines are always static, they never move). The scroll

I have an implicit scalar field defined in 2D, for every point in 2D I can make it compute an exact scalar value but its a somewhat complex computation. I would like to draw an iso-line of that surface, say the line of the '0' value. The function itself is continuous but the '0' iso-line can have multiple continuous instances and it is not guaranteed that all of them are connected. Calculating the value for each pixel is not an option because that would take too much time - in the order of a few seconds and this needs to be as real time as possible. What I'm currently using is a recursive

I am trying to write 2 functions, one to read the matrix (2D array) and other one to print it out. So far I have: /* Read a matrix: allocate space, read elements, return pointer. The number of rows and columns are given by the two arguments. */ double **read_matrix(int rows, int cols){ double **mat = (double **) malloc(sizeof(double *)*rows); int i=0; for(i=0; i<rows; i++){ /* Allocate array, store pointer */ mat[i] = (double *) malloc(sizeof(double)*cols); //what to do after?? return mat; } then the print matrix function, not sure if it is correct void print_matrix(int rows, int cols, double