How can i add a motion effect on a ball as shown in image.
Please help.
Thanks in advance.
If the ball is the only moving element the easiest way to achieve this is to clear screen with a semi-transparent color:
Gdx.gl.glClearColor(0, 0, 0, 0.5f);
If not you can implement a queue that will keep your ball's last positions and will render a ball there with descending transparency. In pseudo code it could be something like
//render() method
for(int i = 0; i < queue.size(); i++)
transparency = i * 1/queue.size();
draw(ball, queue.get(i), transparency);
draw(ball, currentBallPosition)
queue.put(currentBallPosition)
if(queue.size() > 20) //we want to keep last 20 positions
queue.removeLast()
Another nice idea is to use Particle Effects although it will not always do the thing (like when your ball can change color or shape)
Related
I am creating a game like bounce ball using cocos2d-x and box2d. I have different objects like rectangle, square etc.. I am able to detect collision, but i want to detect collision only on top of the objects. What exactly i want is, when the ball is on the top of the object, then only i want to jump the ball.
But, when the ball is collide on remaining side(bottom or left or right) i don't want to jump the ball.
In touchbegan, i am using the following code to the bounce ball. So every touch it is jumping when it collide with remaining side.
if(_ball->boundingBox().intersectsRect(rect->boundingBox()))
{
b2Vec2 force = b2Vec2(0, 550);
_body->ApplyLinearImpulse(force, _body->GetPosition());
}
Any advice?
Following steps can solve your problem-
1) CCRect projectileRect = CCRect(float x, float y, float width, float height);
if(_ball->boundingBox().intersectsRect(projectileRect))
{
b2Vec2 force = b2Vec2(0, 550);
_body->ApplyLinearImpulse(force, _body->GetPosition());
}
2) - Make body of an object and then check their collision.
I got the solution for my question from the below link.
http://www.raywenderlich.com/28606/how-to-create-a-breakout-game-with-box2d-and-cocos2d-2-x-tutorial-part-2
I have a problem. The sprites I'm rendering aren't in the Z position I want them to be.
The game I'm making is a 2D sandbox game - similar to terraria.
I make a 2-dimensional array and then iterate through it with a for-loop.
Basic code outline:
for(int x = 0; x < worldwidth; x ++){
for(int y = 0; y < worldheight; y ++){
//complicated calculations to check which texture it should use
// draws background blocks
Sprite s = new Sprite(texture);
s.setSize(12, 12);
s.setOriginCenter();
s.rotate(rotation);
s.setPosition(x* world.blocksize, y* world.blocksize);
s.draw(batch);
//draws foreground blocks
//same thing as with background blocks, only with a different texture
}
}
I want the player to be between the background and foreground sprites. But if I draw it at the start or the end of the loop, it ends up at the very back or very front.
I tried drawing it after the background tiles, but that didn't work. What do I do? Do I use something instead of a spritebatch for rendering the player?
Okay, second question: Is drawing tiles this way efficient? Am I doing it right, or should I use something like a tilemap?
I have two BitmapData objects with transparency enabled. One is a large red square, the other is a small blue circle.
If, for example, I position the blue circle over the red square. I would like to create an area of transparency in the red square's BitmapData where the blur circle is. Similar to how a mask works.
I have tried using getPixel32() operations but it is very slow (see below). Is there another way I can do this? Thanks
for(var x:int = 0; x < circleBitmapData.width; x++){
for(var y:int = 0; y < circleBitmapData.width; y++){
if(circleBitmapData.getPixel32(x,y) != 0x00000000){
squareBitmapData.setPixel(x,y,0x00000000);
}
}
}
EDIT - I have one possible solution, but it's not ideal. I can merge the two bitmaps, then use the threshold method to turn pixels above a certain value to transparent. So I could set all blue pixels to transparent. However, I get a thin ring of blue around the transparent area
Check out bitmapData's threshold method. It should return you a bitmapData with the intersected area. With that, you don't have to get and set pixel anymore. Also, getPixel32 should have setPixel32 :P
I'm writing a paint program that uses shape brushes to draw by using the matrix function.
Everything works well aside from the fact that it's not smooth at all. There will be gaps in the painting if the mouse is moved at a high speed.
I've looked everywhere but haven't been able to find any solution.
The code basically looks like this:
//Press mouse within container. Uses Matrix to draw instances of the brush.
private function handleMouseDown_drawContainer(e:MouseEvent):void
{
_matrix.identity();
_matrix.translate(mouseX - 10, mouseY - 30);
_layout.bitmapData.draw(_layout.brush, _matrix);
_layout.drawContainer.addEventListener(MouseEvent.MOUSE_MOVE, handleMouseMove_drawContainer);
_layout.drawContainer.addEventListener(MouseEvent.MOUSE_UP, handleMouseUp_drawContainer)
}
//Move mouse within container. Uses Matrix to draw instances of the brush.
private function handleMouseMove_drawContainer(e:MouseEvent):void
{
_matrix.identity();
_matrix.translate(mouseX - 10, mouseY - 30);
_layout.bitmapData.draw(_layout.brush, _matrix);
}
If anyone could help me figure out how to smooth out the drawing, I'd be forever grateful! =p
Thanks in advance.
You probably need some kind of interpolation between the mouse positions... there are of course many ways, I'll describe one very easy to implement but a bit hard to fine tune. Basically instead of drawing in each mouse position, you use an easing equation that follows the mouse with some delay... this way the described line will be a bit smoother, and will draw a few times between each mouse position.
So instead of doing (pseudocode):
onMouseMove {
draw(mouseX, mouseY);
}
You do something like:
x = 0;
y = 0;
onEnterFrame {
x += (mouseX - x) * 0.2;
y += (mouseY - y) * 0.2;
draw(x, y);
}
Although maybe what you really need is a way to limit the maximum distance between points, so if the mouse moves more in one frame, you interpolate points between the two positions and draw as many times as it's needed.
Or if you're looking for smoother lines (avoid sharp corners) maybe you also need to use beziers to control the resulting line.
Anyway, it all depends on the kind of drawing you're looking for.
I am new to AS3 scripting. I have a wide image (movie clip "preform_mc") that I am masking and would like for right button ("right_mc") to dynamically move the image.
The code below moves the image to the right, but its not a dynamic movement (would like an animation effect) and I cant control when the image should stop moving, basically a max amount for the x coordinate.
any help is greatly appreciated!
right_mc.addEventListener(MouseEvent.CLICK, fl_MouseClickHandler_2);
function fl_MouseClickHandler_2(event:MouseEvent):void
{
preform_mc.x += -100;
}
Take a look at Greensock Tweening Library. Using that library you'll be able to easily make a smooth animation of a moving image. For the control of max X you should write an if statement to check whether preform_mc.x is more than the max amount you want.
Code will look something like this:
var min_x:int = -500;
function fl_MouseClickHandler_2(event:MouseEvent):void
{
if(min_x < preform_mc.x)
TweenLite.to(preform_mc, 0.5, {x:preform_mc.x - 100}); // using the library I provided a link to
}