I was trying to create a tic-tac-toe-like game but this time the board is a collection of hexagons in a rhombus shape. See image below:
Each hexagon is an image:
And each image has its own event listener. I am having problem with the clickable area, every time I click the lower two hexagons from the top. The top hexagon receives the tap event. I suspect that its because the PNG image has some portion occupying the lower two hexagons. Please give me recommendations.
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I am currently making some sort of interactive map. It consists of images of 12 areas overlapping. The problem is that the image is squared, so if I click on a state next to it and it overlaps, I can't select it.
Is there a way to make only the image itself 'clickable' and not the transparent part of the image?
so I'm making a game and pretty much when the player (which is a triangular shaped rocket) hits an object flying at you (a rock) the game ends. I have everything working well but my problem is the rocket is a triangle yet the image view its in is a rectangle. So if the edge of the image view touches the rock the game will end even though the actual rocket didn't touch the object. So basically how can I make the rock image view not recognize the parts of the rocket image view which are empty? Basically a triangular shaped image view.
Thank you for your help. Let me know if you need more info or want to see the code I have for them to collide.
You analytically present the triangle with 3 points and a rock with a center and radius then find and implement an algorithm checking a hit test between those 2 shapes. Or draw the two shapes onto some graphics context using an appropriate blending and check for overlapping pixels (for instance draw one as red and another as green and look if a pixel that is both red and green exists) you could actually do that with 2 image views having those colors and .5f alpha added on the 3rd invisible view but you would need to get the image from the view and then iterate through all the pixels. In any of the cases do this check only after the corresponding view frames overlap.
I have an Image of a landscape which i need to fill with different colors.
When i select colors from palette and start scrubbing on any particular part, only that part should get the color even if by mistake i take my finger outside of that image part.
So basically i need to detect which part of image have i tapped so that only that part takes the color.
I am developing this app in Cocos2dx, but any help in logic would be a good point to start.
Here is an example of what i want.
Note : I know i could achieve this by taking separate images and then detecting touches, but that increases the app size by alot of MB's.
I guess user will be able to draw only on white part of the image.
If above is true, what i want you to do is, in your touchesMoved method, check if any black color (non white) pixel is present between previous touch point and current touch point.
If there is no such black pixel, then draw it else dont draw it.
I'm looking for a way to overlay the iOS maps with a grid. The complete earth needs to be divided into squares. The location of the user doesn't effect the placement of the squares (In other words; the squares are always placed the same. On every iPhone, no matter where the user is).
I Looked into MKOverlay, but I've never used this so it's very new to me. Also, when zooming in/out should effect the overlay. It's very important that the squares are always covering the same area on the map (For example; A square should be 100mx100m in real world, when you zoom out, the square should cover the same 100x100).
Is there anybody that can point me in the right direction?
Is it possible to draw the grid from een .xml? Example given; On .XML is holding all squares with their coordinates on the map. When the user loads the map, the 100 squares around the user are loaded.
I want to identify squares/rectangles inside my UIImageView (or UIImage).
I looked at "Very simple image recognition on iOS", but that's not quite what I'm looking.
At the moment I have an UIImageView which is given a UIImage from time to time.
Most of the UIImagees has black squares/rectangles like this:
.
But the corners may (or may not) have rounded edges.
How can I identify the first black square/rectangle's size?
The end result would be to resize my UIImageView to make the first black square in the UIImage fill the screen. Like so:
If your images will always be sharp black squares in a horizontal row, you could use corner detection to identify the rectangles, then pick out the four leftmost corners. I have three variants of corner detectors in my open source GPUImage framework based on the Harris, Noble, and Shi-Tomasi corner detection methods.
Running a GPUImageHarrisCornerDetectionFilter against your boxes with a threshold of 0.4 and sensitivity of 4.0 yields the following result:
They're a little hard to see, but red crosshairs mark where the detector found the corners of your boxes. Again, you just need to take the leftmost four points to find your target rectangle, and then simply scale your image or view so that this rectangle now fills your view.
An example of how to run such feature detection can be found in either the FilterShowcase or FeatureExtractionTest example within my framework. I describe the process by which I do this in this answer over at Signal Processing.
It seems easiest solution would be:
sum up all pixels vertically to the top-most row (like an excel table)
rows with the smallest/biggest value are your "gap" region
width can be derived from (2).
From what I understood about your question, you need to implement the Canny Edge Detection Algorithm for detecting the edges of the black borders in your image.
For this you should use the image processing framework available at the following links
Google
Github
Use the ImageWrapper *Image::cannyEdgeExtract(float tlow, float thigh)function from the Image.m file.