kostub/matheditor

An editor for math equations for iOS

matheditor's Issues

Fractions Inside Fraction Bug

When you hit the "/" key while in the numerator or denominator it adds a one to the number and leaves the original number behind.

支不支持换行？

怎么设置可以换行

Whether it can be achieved on android？

How can I get result of calculations?

For display formulas can use "MTEditableMathLabel" but how can I get it's result ?
for example if I enter label.mathList.stringValue 5^{2}, how can I get it's output.. Please help me out with suitable sample if possible.
@kostub

Textalignment and Autoshrinking

So there are two things that I want to achieve with the MTEditableMathLabel.

1. Change the Textalignment to left

2. Make the Label expand / shrink with the latex inside. I have this code from the example and converted it to Swift 3

`func textModified(_ label: MTEditableMathLabel!) {
let minHeight: CGFloat = 64
// Increase the height of the label as the height increases.
let mathSize: CGSize = label.mathDisplaySize()

    if (mathSize.height > self.editLabel.frame.height - 10) {
        label.layoutIfNeeded()
        // animate

        self.editLabel.frame = CGRect(x: self.editLabel.frame.origin.x, y: self.editLabel.frame.origin.y, width: self.editLabel.frame.width, height: mathSize.height + 10)
        label.layoutIfNeeded()
    }
    else if (mathSize.height < self.editLabel.frame.height - 20) {
        
        let newHeight: CGFloat = max(mathSize.height + 10, minHeight);
        if (newHeight < self.editLabel.frame.height) {
            label.layoutIfNeeded()
            self.editLabel.frame = CGRect(x: self.editLabel.frame.origin.x, y: self.editLabel.frame.origin.y, width: self.editLabel.frame.width, height: newHeight)
            label.layoutIfNeeded()
        }
    }
    
    // Shrink the font as the label gets longer.
    if (mathSize.width > label.frame.size.width - 10) {
        label.fontSize = label.fontSize * 0.9;
        
    } else if (mathSize.width < label.frame.size.width - 40) {
        let fontSize: CGFloat = min(label.fontSize * 1.1, 30);
        if (fontSize > label.fontSize) {
            label.fontSize = fontSize;
        }
    }
}`

Do you have code do what this code is doing with the height with the width ?

Error when trying to edit Matrix

So I was working on making it possible, so that you could insert an editable Matrix in your editable math label. What I did was inserting this code into MTEditableMathLabel:

`- (void) insertMatrix: (int)rows :(int)columns :(NSString )type
{
MTMathAtom atom = [MTMathAtomFactory placeholderMatrix:columns :rows :type];

if (_insertionIndex.subIndexType == kMTSubIndexTypeDenominator) {
    if (atom.type == kMTMathAtomRelation) {
        // pull the insertion index out
        _insertionIndex = [[_insertionIndex levelDown] next];
    }
}

if (atom) {
    if (![self updatePlaceholderIfPresent:atom]) {
        // If a placeholder wasn't updated then insert the new element.
        [self.mathList insertAtom:atom atListIndex:_insertionIndex];
    }
    if (atom.type == kMTMathAtomFraction) {
        // go to the numerator
        _insertionIndex = [_insertionIndex levelUpWithSubIndex:[MTMathListIndex level0Index:0] type:kMTSubIndexTypeNumerator];
    } else {
        _insertionIndex = _insertionIndex.next;
    }
}

self.label.mathList = self.mathList;
[self insertionPointChanged];

if ([self.delegate respondsToSelector:@selector(textModified:)]) {
    [self.delegate textModified:self];
}

}`

and this code into MTMathAtomFactory

`+ (MTMathAtom *)placeholderMatrix: (int)width :(int)height :(NSString )envname
{
NSError error;

NSMutableArray<NSMutableArray<MTMathList*>*>* rows = [[NSMutableArray alloc] initWithCapacity:(NSInteger)height];
for (int y = 0; y < height; y++)
{
    NSMutableArray<MTMathList*>* row = [[NSMutableArray alloc] initWithCapacity:(NSInteger)width];
    
    for (int x = 0; x < width; x++)
    {
        MTMathList* list = [MTMathList new];
        
        [list addAtom:[self placeholder]];
        
        row[x] = list;
    }
    
    rows[y] = row;
}
MTMathAtom* table = [MTMathAtomFactory tableWithEnvironment:envname rows:rows error:&error];

return table;

}`

This displays the matrix fine, but when I try to select one of the Values in the matrix I get this error, which I have no idea where it is coming from.

'MTLine type regular inside an MTLine - shouldn't happen'

But the display is exactly the way I want it to be. What is wrong here ? I really need help on this please. Thanks a lot for any help in advance.

Math keyboard not working from ios 16

MathEditor keyboard is showing since apple removed UIRemoteKeyWindow..Any suggesstion on this pls

becomeFirstResponder takes a long time

There is a significant delay between a user initiating the edit on the label and the math keyboard appearing, resulting in a poor user experience.

I am wondering if you have any plans to address this. If not, any pointers for how it could be fixed would be appreciated.

Latex to unicode normal form

Is there a way in the iosMath Library to transform the Latex into unicode form or do I have to write a parser for this?

I used the [MTMathListBuilder mathListToString:[_mathLabel mathList]]; to get the Latex from the EditableLabel, now I want to parse the Latex into the unicode form, for example

\frac{5x^{2}}{2}+(58+95x)\div \cos (x^{2})

(5x^2)/(2) + (58+95x) / cos (x^2)

Fill label from LaTeX

Hi,
first of all thanks for your amazing work, I hope you still follow this project. How can I pre-fill the label starting from a LaTeX string?

Thanks

How do you get the raw Latex from the MTEditableMathLabel?

How do you get the raw Latex from the MTEditableMathLabel if it is possible. I didnt find any label.text member

Change cursor location with navigating buttons

Hello,

I created two buttons which allow to navigate Left and navigate Right one position. I thought by just calling previous and next on the _mathIndex it would go over the whole equation. However, if there are fractions or square roots, or an any atom of any other type it skips over them and does not enter them.

I thought maybe I should level up or level down depending if the next _mathIndex is of type fraction or root or whatever, but I had no luck. It just keeps skipping over them.

I'm guessing I have the logic of the class understood wrong. How am I supposed to be able to traverse 1 position at a time throughout the equation?

Implement UILabel-like autoshrinking

The ideal interface looks like:

@interface MTMathUILabel : UIView
<...>
@property (nonatomic) BOOL adjustsFontSizeToFit;
<...>
@end

Do you have any ideas about the clear way to implement it?

Currently I see the following solutions:

1. Use binary search or similar approach to find an optimal size over a few iterations.
2. Calculate ratio of a desired size to an actual size and use it to calculate the font size. This is fast, but in terms of math rendering the font size does not have a constant correlation with an output size.
3. (not the clearest one, but robust) Just resize the rendered image to fit label.

Outer brackets not rendering properly

when entering the above equation. the opening bracket is not growing fully to the content.

Degree Radical Bug

The Degree in the radical has a major bug which crashes on [self insertionPointChanged] when there are more than one digit in the degree.

Fraction inside root

Hi,

If you look at the screenshot below, when typing fraction while inside the root, you cannot continue writing anything under that root, it continues to write formula outside of the root.
The problem is, I assume, that you cannot somehow select that fraction as you can other elements so it doesn't really know where to continue. Because of this you also cannot delete just the fraction but it deletes the whole root.

Is this a bug or I am missing something?

Created New Keyboard

Hello,

I created a new keyboard the same way you have made the keyboard. However, the keyboard I created has integrals, ointegrals, summations, limits, and many other special characters which are included in Latex. However, the MTEditableMathLabel is not drawing these special characters. I noticed since you have technically mapped in the code how each fractions, superscripts, subscripts it will draw them correctly accordingly given the cases, doing it this way will not be maintainable in the long run. Is there a way we can pass any latex and have it drawn and made editable correctly without having to go through the hassle of writing code for each new button or functionality added? I am trying to achieve a keyboard similar to PhotoMath with more functionalities and keys.

(Also I admit I might be wrong in the way I have analyzed your code, maybe I did something wrong)

Matrices, Custom keyboards and horizontal Scrolling

So first of, thank you so much for developing such an awesome Pod. It really solved a lot of my problems but I have a few things to still take care of and this seemed like the right place to ask.

Is it possible, and if yes how, to enter and edit matrices ?

How do I implement a custom keyboard in Swift ? I am writing my App in swift and I would like to make a custom keyboard. So I implemented the MTMathKeybard protocol but I can’t get info about what methods to implement.

When the Input gets wider then the width of the label theres currently (to my knowledge) to way to get back and forth. How would you go about this ?

I also have a little Question about your uneditable label but it is in the Issues threat of the Repository. But again, thank you so much for sharing this awesome work. I really am amazed by your work.

All my best,
Jony

Support for multiple lines

Currently the text font is reduced when we type beyond view bounds. We want to allow typing in next line when frame exceeds the bounding rect. Can we use CTFrame instead of CTLine to make it multiline?

Squareroot can't be inside squareroots?

Hi,
I don't see why when you press square root symbol it would have to move to the outside of the current square root.
How to fix this?
Thanks

How to add Integration and all this sign by keyboard in MathEditor? Please suggest