I have scuccesfully added canvas to bitmap using WritebleBitmap class and then trying to use the bitmap to save image on client system through SaveFileDilogue. I am using the method of FluxJpegCore image encoding where we use raster arrays to generate image pixel-wise.
Below is the part of the code which does the job.
byte[][,] raster = new byte[bands][,];
for (int i = 0; i < bands; i++)
{
raster[i] = new byte[width, height];
}
for (int row = 0; row < height; row++)
{
for (int column = 0; column < width; column++)
{
int pixel = bitmap.Pixels[width * row + column];
raster[0][column, row] = (byte)(pixel >> 16);
raster[1][column, row] = (byte)(pixel >> 8);
raster[2][column, row] = (byte)pixel;
}
}
All goes fine with image saving, however when i zoom the image and then print it, the code fails at the line "raster[i] = new byte[width, height];". System out of memory error is raised. Can anyone help me to find the solution on this?
I'm not sure there is a solution to be had. You have 3 arrays that each need a contiguous 163MB block of memory. The problem will be that the process does not have 3 such address blocks available that are that size.
Bear in mind also that the bitmap.Pixels will be an array 653MB big.
Your only real hope(s) would be to
Use the app OOB, hopefully VM fragmentation would be limited and allow such very large arrays to be allocated.
If FluxJpegCore can use Stream instead of a byte array and does so effeciently (still a lot of work for you to do there)
Move up to Silverlight 5 and host your app in a 64 bit browser instance.
Going with #AnthonyWJones I'm pretty sure width or height is something like double.NAN. Make sure you place a check to see is width and height is a real number. Also check that your array does not a lot for more than possible within Silverlight
Related
How to create a world map using C language?
Here, I want to generate a 1000*1000 two dimensional array of world map. Within the array, the land part is marked with value 1 and the sea part is marked with value 0. Is there any simple way to create?
Obviously, there's no algorithm which describes the shape of the coastline of the continents ;)
But you could use e.g. Smrender (http://www.abenteuerland.at/smrender/), feed it with the coastline of e.g. OpenStreetMap or Naturalearthdata and a single rule. Let it create a PNG image with 1000x1000 pixels.
EDIT:
With ImageMagick (convert) you can directly convert a PNG into a C header file as an array.
Go to Openstreetmap.org (or Googlemaps), zoom out until you see the whole world, make a screenshot, open it in your favorite image manipulation program and cut and resize it to 1000x1000, then run convert input.png output.h.
Bernhard
I wrote a answer in game development some hours ago that can help you, heres the topic, it's written in javascript, but it won't be hard to translate to c.
In the example you fill the whole map of 0's and then you trace a path randomly, if you want to smooth the map later you can make a snippet that loops all the watter tiles and converts them to land if there are 3 or more land tiles adjacent to it, do it 40-60 times and you will get a smoother shore and no "holes" in the continent.
EDIT
Updating the answer with a demo in C.
I've not tested it, but if you include the headers and checks the code, this is the answer.
//Create and populate the map
int mapsize = 100;
int map[mapsize*mapsize];
for(int t = 0; t < mapsize*mapsize; t++) map[t] = 0;
//make the path
int currPos[2] = {0,50};
map[currPos[0]+(currPos[1]*mapSize)] = 1;
int landTiles = 20000;
for(var l = 0; l < landTiles; l++){
int dir[2] = {RANDOM_BETWEEN_-1_AND_1, RANDOM_BETWEEN_-1_AND_1};
int next[2] = {currPos[0]+dir[0], currPos[1]+dir[1]};
map[next[0]+(next[1]*mapSize)] = 1;
currPos = next;
}
//Draw the map
for(var row = 0; row < mapSize; row++){
for(var col = 0; col < mapSize; col++){
cout << map[col+(row*mapSize)];
}
cout << endl;
}
You could have some program or script (taking as input some representation of some image of the Earth) which generates a long C file like
const char map[1000][1000] = {
{'0', '1', //.... etc for the first fow
},
{'0', '0', '0', '1', //... etc
}
/// etc for other rows
};
See also XBM for an example.
I am trying to write a program that will recognize an image on the screen, compare it against a resource library, and then calculate based on the result of the image source.
The first thing that I did was to create the capture screen function which looks like this:
private Bitmap Screenshot()
{
System.Drawing.Bitmap Table = new System.Drawing.Bitmap(88, 40, PixelFormat.Format32bppArgb);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(RouletteTable);
g.CopyFromScreen(1047, 44, 0, 0, Screen.PrimaryScreen.Bounds.Size);
return Table;
}
Then, I analyze this picture. The first method I used was to create two for loops and analyze both the bitmaps pixel by pixel. The problem with this method was time, it took a long time to complete 37 times. I looked around and found the convert to bytes and the convert to hash methods. This is the result:
public enum CompareResult
{
ciCompareOk,
ciPixelMismatch,
ciSizeMismatch
};
public CompareResult Compare(Bitmap bmp1, Bitmap bmp2)
{
CompareResult cr = CompareResult.ciCompareOk;
//Test to see if we have the same size of image
if (bmp1.Size != bmp2.Size)
{
cr = CompareResult.ciSizeMismatch;
}
else
{
//Convert each image to a byte array
System.Drawing.ImageConverter ic = new System.Drawing.ImageConverter();
byte[] btImage1 = new byte[1];
btImage1 = (byte[])ic.ConvertTo(bmp1, btImage1.GetType());
byte[] btImage2 = new byte[1];
btImage2 = (byte[])ic.ConvertTo(bmp2, btImage2.GetType());
//Compute a hash for each image
SHA256Managed shaM = new SHA256Managed();
byte[] hash1 = shaM.ComputeHash(btImage1);
byte[] hash2 = shaM.ComputeHash(btImage2);
for (int i = 0; i < hash1.Length && i < hash2.Length&& cr == CompareResult.ciCompareOk; i++)
{
if (hash1[i] != hash2[i])
cr = CompareResult.ciPixelMismatch;
}
}
return cr;
}
After I analyze the two bitmaps in this function, I call it in my main form with the following:
Bitmap Table = Screenshot();
CompareResult success0 = Compare(Properties.Resources.Result0, Table);
if (success0 == CompareResult.ciCompareOk)
{ double result = 0; Num.Text = result.ToString(); goto end; }
The problem I am getting is that once this has all been accomplished, I am always getting a cr value of ciPixelMismatch. I cannot get the images to match, even though the images are identical.
To give you a bit more background on the two bitmaps, they are approximately 88 by 40 pixels, and located at 1047, 44 on the screen. I wrote a part of the program to automatically take a picture of that area so I did not have to worry about the wrong location or size being captured:
Table.Save("table.bmp");
After I took the picture and saved it, I moved it from the bin folder in the project directly to the resource folder and ran the program again. Despite all of this, the result is still ciPixelMismatch. I believe the problem lies within the format that the pictures are being saved as. I believe that despite them being the same image, they are being analyzed in different formats, maybe one of the pictures contains a bit more information than the other which is causing the mismatch. Can somebody please help me solve this problem? I am just beginning with my c# programming, I am 5 days into the learning process, and I am really at a loss for this.
Yours sincerely,
Samuel
I am working on a homework project to rotate a simple 2D array holding RGB values for a PGM file.
I've read many posts in these forums about how to do this in C, and I've almost got it working. My output file has the correct dimensions and is rotated, but there is a thick black border around the top and sides. I just can't figure out what I'm doing wrong.
Any help would be greatly appreciated!
I modified the code presented here to get started, and this is the rotate90 function I'm working on now:
PGMImage* rotate90(PGMImage *old_img)
{
int x, y;
PGMImage *new_img = malloc(sizeof(PGMImage));
new_img->maxVal = old_img->maxVal;
new_img->width = old_img->height;
new_img->height = old_img->width;
for (x = 0; x < old_img->width; x++)
{
for (y = 0; y < old_img->height; y++)
{
new_img->data[old_img->height - 1 - y][x].r = old_img->data[x][y].r;
new_img->data[old_img->height - 1 - y][x].g = old_img->data[x][y].g;
new_img->data[old_img->height - 1 - y][x].b = old_img->data[x][y].b;
}
}
return new_img;
}
void main()
{
PGMImage* img = malloc(sizeof(PGMImage));
getPGMfile("columns.pgm", img);
save("columns_new.ppm", rotate90(img));
}
The save() and getPGMfile() functions work perfectly on their own.
It's only when I pass the result of my rotate90() function to save() that I get the funky results.
How about trying memcpy(new_img, old_img, sizeof(PGMImage) after the malloc statement. Maybe some other attributes besides width and height are not initialized. And also, if the data variable is a pointer, did you malloc a piece of memory for data for the new_img object?
So here is my situation. I'm new to programming and I've just started making a very, very basic platform game. And I mean literally a game with platforms.
I've got my character in and jumping about and I've created my platforms as an array. This was so that I could put them all side by side at the bottom. Now there is other ways I can do this to get round the problem but I wanted to find out how to do it for an array.
So I've got my character falling with this
kirby.yVelocity += 1.0f
Which is all fine but I want his yVelocity to go to 0.0f when he hits any of the platforms in the array.
So I tried this piece of code
if (plat[i].drawRect.Intersects(kirby.drawRect))
{
kirby.yVelocity = 0.0f
}
which I thought would work but it gives me an error for the [i] saying that it isn't applicable in this context.
few notes:
kirby is my character name, drawRect is the definition for Rectangle, plat is my Platform array which consists of 13 platforms.
Thanks to anyone who can help
Update
The problem is any variation of plat.drawRect or plat[i].drawRect don't work. Here is all my code relating to the platform arrays.
struct Platform
{
public Texture2D txr;
public Rectangle drawRect;
}
Platform[] plat;
plat = new Platform[13];
for (int i = 0; i < plat.Length; i++)
{
plat[i].txr = Content.Load<Texture2D>("platform");
plat[i].drawRect = new Rectangle(i * plat[i].txr.Width, 460, plat[i].txr.Width, plat[i].txr.Height);`
}
for (int i = 0; i < plat.Length; i++)
{
spriteBatch.Draw(plat[i].txr, plat[i].drawRect, Color.White);
}
spriteBatch.End();
Seems like you have to add a for loop, to loop over the platforms. Maybe like this:
for(Platform : plat){
if (platform.drawRect.Intersects(kirby.drawRect)){
kirby.yVelocity = 0.0f;
}
}
Here, I'm assuming you're using Java and Platform is the class of your plat-array, which has class List<Platform>.
I had a hard time trying to word my question properly, so i'm sorry if it seems confusing. Also i'm using the flixel library in flash builder. It may not be that important butcause probably anyone that knows a little more than me or even a little AS3 could probably see what i'm doing wrong.
Anyway, what i'm trying to do is basically create 10 instances of this square object I made. all I have to do is pass it an x an y coordinate to place it and it works. so ive tested if i just do:
var testsquare:Bgsq;
testsquare = new Bgsq(0,0);
add(testsquare);
it works fine and adds a square at 0,0 just like i told it to, but i want to add 10 of them then move the next one that's created 25 px to the right (because each square is 25px)
my problem is that I only ever see 1 square, like it's only making 1 instance of it still.
anyone possibly have an idea what I could be doing wrong?
var counter:int = 0;
var bgsqa:Array = new Array;
for (var ibgs:int = 0; ibgs < 10; ibgs++)
{
bgsqa[counter] = new Bgsq(0,0);
bgsqa[counter].x += 25;
add(bgsqa[counter]);
counter++;
}
There's a lot you're doing wrong here.
First off, you're using a pseudo-iterator (counter) to access array elements through a loop instead of, well, using the iterator (ibgs).
Second, I don't see anything in the array (bgsqa) you're iterating through. It's no wonder you're having problems. Here's what you should do.
var bgsqa:Array = [];
for(var i:int=0;i<10;i++)
{
var bgsq:Bgsq = new Bgsq(i * 25, 0);
add(bgsq);
bgsqa.push(bgsq);
}
That should probably do it if your post is accurate.
for (var ibgs:int = 0; ibgs < 10; ibgs++)
{
bgsqa[counter] = new Bgsq(0,0);
bgsqa[counter].x = counter * 25;
add(bgsqa[counter]);
counter++;
}
They start at 0, so applying += is simply adding 25 to 0. This should do the trick.