I intend to fit an image centered horizontally and vertically inside a J2ME form. However I couldn't find useful markup elements to do so. So I intend to create one totally transparent image the size of the form element and superimpose my intended image on it centered. And place the resulting image in the form (without using a canvas). I am looking for ways of doing this because my knowledge of J2ME is limited.
Any help, please?
public static Image CreateCompositeImage(Image oImage,int formWidth,int formHeight){
final int imageWidth=oImage.getWidth();
final int imageHeight=oImage.getHeight();
int[] imge=new int[imageWidth*imageHeight];
oImage.getRGB(imge,0,imageWidth,0,0,imageWidth,imageHeight);
final int topMargin=(formHeight-imageHeight)/2;
final int leftMargin=(formWidth-imageWidth)/2;
final int pixelTop=topMargin*formWidth;
int[] c=new int[formWidth*formHeight];
int p=0, r=0;
for (int i=0;i<pixelTop;i++){
c[p++]=0xff000000;
}
for (int j=0;j<imageHeight;j++){
for (int i=0;i<leftMargin;i++){
c[p++]=0x880000ff;
}
for (int i=0;i<imageWidth;i++){
c[p++]=imge[r++];
}
for (int i=0;i<leftMargin;i++){
c[p++]=0x8800ff00;
}
}
int pixelBottom=formWidth*formHeight-p;
for (int i=0;i<pixelBottom;i++){
c[p++]=0xffffffff;
}
return Image.createRGBImage(c,formWidth,formHeight,true);
}
A better approach is to create new class that inherits from CustomItem, or to use a Canvas instead of the Form.
In both cases you override the paint() method.
There you get a Graphics-Object. You use this object do do your drawing.
Especially for you it has a drawImage() method, where you can just put in the position.
You then need no pixel data manipulation.
Overriding CustomItem or Canvas is something you do often in Java-me programming, so it is worth learn it.
Related
Iv looked around online for a solution to this issue but iv been unable to solve it.
I want to extend the sprite class to make my own interactive circle. Everything works but setting the X,Y, Width and height of the custom class does not work:
class CircleDraw extends Sprite
{
public function new(x:Int,y:Int,width:Int,height:Int)
{
super();
this.x = x;
this.y = y;
this.width = width;
this.height = height;
drawCircle();
}
private function drawCircle()
{
this.graphics.beginFill(0xffffff);
this.graphics.drawCircle(this.x,this.y, this.width);
this.graphics.endFill();
}
}
The approach above does not work as expected, setting x,y and width via the constructor results in literally nothing appearing. Yet if i set them manually, either within the class
this.graphics.drawCircle(200,200, 30);
Or prior to addChild:
circle = new CircleDraw(10,10,100,200);
circle.x=100;
circle.y=100;
it then appears on screen. also after adding it like so once the values have been added manually within the class rather than this.x etc:
circle = new CircleDraw(10,10,100,200);
addChild(circle);
So my question is this, how do i extend a class (Sprite) and allow the constructor to modify its parents default variables and keep the values?
EDIT
Just to provide all the code as requested:
This does not work:
circle = new CircleDraw(10,10,100,200);
addChild(circle);
when Circle draw is like this:
class CircleDraw extends Sprite
{
public function new(x:Int,y:Int,width:Int,height:Int)
{
super();
this.x = x;
this.y = y;
this.width = width;
this.height = height;
drawCircle();
}
private function drawCircle()
{
this.graphics.beginFill(0xffffff);
this.graphics.drawCircle(this.x, this.y, this.width);
this.graphics.endFill();
}
}
It does work if i modify the method:
private function drawCircle()
{
this.graphics.beginFill(0xffffff);
this.graphics.drawCircle(200, 200, 30);
this.graphics.endFill();
}
Or if during the instancing of the object i set the X and Y variables as mentioned before the edit.
You are indeed setting the base class variables successfully, it's just that DisplayObject.width has a rather specific (and perhaps not that obvious) behavior.
width:Float
Indicates the width of the display object, in pixels. The width is calculated based on the bounds of the content of the display object. When you set the width property, the scaleX property is adjusted accordingly, as shown in the following code:
Except for TextField and Video objects, a display object with no content(such as an empty sprite) has a width of 0, even if you try to set width to a different value.
—OpenFL API: DisplayObject: width
In this sense, OpenFL follows the ActionScript 3.0 API.
From what I can surmise, it looks like you're trying to override a constructor (new) that takes no arguments.
I'm not entirely sure, but that might not get you what you want. What I think you're actually doing is just creating a method "new" on the extended class, and then within it, feeding the parent nothing (super()). So the parent will not have the constructor arguments. It would be interesting to do look at that object in a debugger and look at the instance properties vs. the parent ones.
There's probably a way around that, but I think you might want to look at doing this via composition instead of inheritance. For example, in "new", create a new instance of a sprite, and manipulate the properties of that.
class MySprite
{
public var sprite : Sprite;
public function new ( ) {
sprite = new Sprite ();
}
}
You would then perform your operations on that sprite instance. Essentially, you are just wrapping a sprite in your own class. Decorator, more or less.
I found some reference to the topic here (it's been a while since I did any Flash programming), it shows addChild and removeChild implementations, etc.
http://old.haxe.org/forum/thread/685
From the (partial) code you posted, it looks it should work.
In other words, setting parent's variables like that should work.
I doubt there are some other code you didn't post gets in the way. I suggest you print out the x, y values in the drawCircle call to debug.
I also doubt the circle is drawn off-screen so you can't see it. Because you first moved the sprite, to (x,y) and then draw a circle in (x,y) inside the sprite. So effectively the circle is at (2x,2y) in global space
EDIT:
this.graphics.drawCircle(200,200, 30);
You claim this worked. Should draw at (210,210) with radius 30
circle = new CircleDraw(10,10,100,200);
circle.x=100;
circle.y=100;
You claim this worked. Should draw at (200,200) with radius 100
circle = new CircleDraw(10,10,100,200);
addChild(circle);
You claim this didn't work. Should draw at (20,20) with radius 100
From the above three version, you are actually drawing at different places with different sizes. So I still suspect that "didn't work" may due to the fact that you are drawing at some places not in sight.
So I still suggest you print out the value of x, y, width inside the private drawCircle function to see what's happening
Be aware, that you are kind of dealing with 2 coordinate spaces. The one were the Sprite will be added and the graphics object of that Sprite. If you set this.x and this.width you are actually setting properties of this Sprite. So in regards of positing you are moving the Sprite itself in that case. The Sprite "graphics" property has it's own coordinate space.
For example if you pass x=100 in your CircleDraw constructor function you are first moving the sprite itself by x=100 and then draw the circle with an x offset of 100. So if you would add the sprite directly to the Stage you would start drawing your circle actually at x=200, because you effectively applied the position twice. It seems to me this is not what you actually are intending.
Also your CircleDraw instance (which is also a Sprite of course) is "empty" when you are constructing it. So calling this.width = width in your constructor has no effect. this.width will stay 0 because the Sprite has no contents at that point. So in the drawCircle method you are drawing a circle with a width of 0.
Probably the better solution would be to simply pass the arguments of your constructor function to your drawCircle function, without setting any properties.
I want to have a fullscreen mode that keeps the aspect ratio by adding black bars on either side. I tried just creating a display mode, but I can't make it fullscreen unless it's a pre-approved resolution, and when I use a bigger diaplay than the native resolution the pixels become messed up, and lines appeared between all of the tiles in the game for some reason.
I think I need to use FBOs to render the scenario to a texture instead of the window, and then just use a fullscreen approved resolution and render the texture properly stretched out in the center of the screen, but I just don't understand how to render to a texture in order to do that, or how to stretch an image. Could someone please help me?
EDIT
I got fullscreen working, but it makes everything all broken looking There are random lines on the edges of anything that's written to the window. There are no glitchy lines when it's in native resolution though. Here's my code:
Display.setTitle("Mega Man");
try{
Display.setDisplayMode(Display.getDesktopDisplayMode());
Display.create();
}catch(LWJGLException e){
e.printStackTrace();
}
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0,WIDTH,HEIGHT,0,1,-1);
glMatrixMode(GL_MODELVIEW);
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
try{Display.setFullscreen(true);}catch(Exception e){}
int sh=Display.getHeight();
int sw=WIDTH*sh/HEIGHT;
GL11.glViewport(Display.getWidth()/2-sw/2, 0, sw, sh);
Screenshot of the glitchy fullscreen here: http://sta.sh/021fohgnmxwa
EDIT
Here is the texture rendering code that I use to draw everything:
public static void DrawQuadTex(Texture tex, int x, int y, float width, float height, float texWidth, float texHeight, float subx, float suby, float subd, String mirror){
if (tex==null){return;}
if (mirror==null){mirror = "";}
//subx, suby, and subd are to grab sprites from a sprite sheet. subd is the measure of both the width and length of the sprite, as only images with dimensions that are the same and are powers of 2 are properly displayed.
int xinner = 0;
int xouter = (int) width;
int yinner = 0;
int youter = (int) height;
if (mirror.indexOf("h")>-1){
xinner = xouter;
xouter = 0;
}
if (mirror.indexOf("v")>-1){
yinner = youter;
youter = 0;
}
tex.bind();
glTranslatef(x,y,0);
glBegin(GL_QUADS);
glTexCoord2f(subx/texWidth,suby/texHeight);
glVertex2f(xinner,yinner);
glTexCoord2f((subx+subd)/texWidth,suby/texHeight);
glVertex2f(xouter,yinner);
glTexCoord2f((subx+subd)/texWidth,(suby+subd)/texHeight);
glVertex2f(xouter,youter);
glTexCoord2f(subx/texWidth,(suby+subd)/texHeight);
glVertex2f(xinner,youter);
glEnd();
glLoadIdentity();
}
Just to keep it clean I give you a real answer and not just a comment.
The aspect ratio problem can be solved with help of glViewport. Using this method you can decide which area of the surface that will be rendered to. The default viewport will cover the whole surface.
Since the second problem with the corrupt rendering (also described here https://stackoverflow.com/questions/28846531/sprite-game-in-full-screen-aliasing-issue) appeared after changing viewport I will give my thought about it in this answer as well.
Without knowing exactly how the rendering code for the tile background looks. I would guess that the problem is due to any differences in the resolution between the glViewport and glOrtho calls.
Example: If the glOrtho resolution is half the viewport resolution then each openGL unit is actually 2 pixels. If you then renders a tile between x=0 and x=9 and then the next one between x=10 and x=19 you will get an empty space between them.
To solve this you can change the resolution so that they are the same. Or you can render the tile to overlap, first one x=0 to x=10 second one x=10 to x=20 and so on.
Without seeing the tile rendering code I can't verify it this is the problem though.
I want to make UI for tablet like shown in images.This UI will repeat according to number of items. And the position of each block (i.e small or big block) can change dynamically. Please give me suggestion which view,layout i should use.
Any suggestion would be appreciated...thanks in advance.
If you are targeting a API v14 or above, you can use GridLayout: http://developer.android.com/reference/android/widget/GridLayout.html
Using LinearLayout where each category is added and using RelativeLayout for each category is a good option. You should customize onlayout method of the relative layout as a function of number of products it contains.
You can use fragments, listview as well.
EDIT after image change: You can just extend relativelayout and override onLayout method. This will perform better than nested layouts and I can't think of anything else you can get away with less effort.
EDIT for elaboration:
Here is an example class I use. Basically in the onlayout method you make every decision and tell all the child views to lay them in a rectangle by calling layout method of each of them and passing the parameters of the rectangle. See how I use layout method of child view to dictate the rectangle.
public class KnockPile extends HandPile
{
private static final String TAG = "KnockPile";
static final int EXPECTED_CARDS = 3;
int mColoring; // this is the coloring group this pile is associated with.
// every card added to this pile should be set with this color.
public KnockPile(Context context, GameActivity ref , int ingroup)
{
super(context );
mColoring = ingroup;
mActivityReference = ref;
setWillNotDraw(false);
setClickable(true);
setOnDragListener(this);
mCardBorders = new ArrayList<Integer>();
final LayoutTransition transition = new LayoutTransition();
setLayoutTransition(transition );
//transition .enableTransitionType(LayoutTransition.CHANGING);
//transition .disableTransitionType(LayoutTransition.CHANGE_APPEARING);
}
/**
* this overrides the card ordering of handpile. This method lays the cards in a linear fashion.
* Possibly overlapping fashion. This is not dependent to orientation of screen.
*
* #see com.kavhe.kondi.gin.layouts.HandPile#onLayout(boolean, int, int, int, int)
*/
#Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
int availablewidth = getMeasuredWidth() ;//this is the maximum availlable
int distance = availablewidth /Math.max(getChildCount(), 1) ; // the horizontal distance between two cards
Log.v(TAG,"available width onlayout is :" + availablewidth +"and distance is " + distance);
int cardheight = getHeight();
int cardwidth = cardheight*3/4;
if(distance > cardwidth) distance = cardwidth;
mCardBorders.clear();
for(int i = 0 ; i < mCards.size() ; i++)
{
//save this border into a global variable so that it can be used when one of the cards dragged
//by user to show that user can insert to that location
mCardBorders.add( i*distance);
mCards.get(i).layout( i*distance , 0 , cardwidth+ i*distance , cardheight);
}
}
}
and this is from documentation
protected void onLayout (boolean changed, int left, int top, int right, int bottom)
Called from layout when this view should assign a size and position to each of its children. Derived classes with children should override this method and call layout on each of their children.
Parameters
changed This is a new size or position for this view
left Left position, relative to parent
top Top position, relative to parent
right Right position, relative to parent
bottom Bottom position, relative to parent
It is also possible through table layout with its row span property
Are the "products" always going to fit nicely on lines as you have drawn? If then, you can use LinearLayouts (Vertical and Horizontal) nested in each other.
To design such UIs for Tablets you should use Fragments and inside the fragment add/remove your respective layouts. If you are taking Relative Layouts then proper usage of RelativeLayout.LayoutParams is required.
If you are looking for a best example which uses Fragments try Google IO app source. It uses various dynamic UI features.
Hope it helps !
With the help of StaggeredGridView I sloved my requirement.
Thanks to all for help and support.
I would like to generate random/noise points along each character of a multiple line text. I've tried this with the Geomerative library, but unfortunately it does not support multi line. Any other solution?
You could find a library to get the path points of the text or if simply adding points, you could get a 2D snapshot(either using get() or PGraphics) of the text and fill in pixels. Here's a minimal example.
PImage snapshot;
int randomSize = 3;
void setup(){
//render some text
background(255);
fill(0);
textSize(40);
text("Hello",0,50);
//grab a snapshot
snapshot = get();
}
void draw(){
int rx = (int)random(snapshot.width);//pick a random pixel location
int ry = (int)random(snapshot.height);//you can pick only the areas that have text or the whole image bot a bit of hit&miss randomness
//check if it's the same colour as the text, if so, pick a random neighbour and also paint it black
if(snapshot.get(rx,ry) == color(0)) snapshot.set(rx+((int)random(randomSize,-randomSize)),ry+((int)random(randomSize,-randomSize)),0);
image(snapshot,0,0);
}
I am using Qt and I am new to Qt. I am getting stream of string data from server in particular port.
I am receiving 1 and 0. each time I receive one line like this
1111110001111111111111111111100000000000011111111111
After getting n number of times I need to create binary image file from the data. 1 for white and 0 for black.
How to do this? I already implement the receiving data but I have no idea how to convert this data to image.
Please help me to find the solution for this problem.
You must know dimensions of your image (for example NxM)
According to dimensions of image, you must parse string what you got (think on how to write correct cycle to get NxM 2D array from 1D array consisting NxM elements).
For holding your image data you can use QImage class. Create QImage object, passing to constructor height and width, use its method to fill image. For setting some color of pixel, you can use QImages method setPixel ( int x, int y, uint index_or_rgb ).
Thats all. Good luck!
You may try doing this way
QImage Image(500,500, QImage::Format_Indexed8);
for(int i=0;i<500/*image_width*/;i++)
{
for(int j=0;j<500/*image_height*/;j++)
{
QRgb value;
if(data[i*j] == 0)/*the data array should contain all the information*/
{
value = qRgb(0,0,0);
Image.setPixel(i,j,qGray(value))
}
else
{
value = qRgb(255,255,255);
Image.setPixel(i,j,qGray(value))
}
}
}
From Qt docs:
"Because QImage is a QPaintDevice subclass, QPainter can be used to draw directly onto images."
So, you can create QImage sized to 500x500
QImage image = QImage(500,500)
and then draw on this image
QPainter p(&image);
p.drawPoint(0,0);
p.drawPoint(0,1);
etc;
Another way is to save your bit stream into array char[] and simply create QImage with format Format_Mono or Format_MonoLSB.
QImage image = QImage(bitData, 500, 500, Format_Mono);
Thanks For help i created image. here My Code
QImage testClass::GetImage(QString rdata, int iw, int ih)
{
QImage *Image=new QImage(iw,ih,QImage::Format_ARGB32);
for(int i=0;i<ih;i++)
{
for(int j=0;j<iw;j++)
{
if(rdata.at((i*iw)+j) == '0')
Image->setPixel(QPoint(j,i),qRgb(0,0,0));
else
Image->setPixel(QPoint(j,i),qRgb(255,255,255));
}
}
return *Image;
}