Ad5001/LogarithmPlotter
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Updating with LaTeX for v0.2.0

Adsooi 2022-08-17 21:41:44 +00:00
parent 35a6c545bc
commit 3dc9d197b3
1 changed files with 14 additions and 37 deletions
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Adding-new-objects.md

@ -35,7 +35,8 @@ To create an object, create a new file javascript files in `LogarithmPlotter/qml
You can also import other libraries like this:
- `.import "../utils.js" as Utils` for string manipulation.
- `.import "../objects.js" as Objects` to interact with other objects.
- `.import "../historylib.js" as HistoryLib` to create and manipulate history entries.
- `.import "../objects.js" as Objects` to interact with other objects.
- `.import "../math/latex.js" as Latex` to use LaTeX helper functions.
There exists two kinds of objects:
- Drawable (extending the `Common.DrawableObject` class, the most primitive kind of object)
@ -46,6 +47,7 @@ There exists two kinds of objects:
Executable objects can be targeted by XCursors to calculate their value at a given x coordinate.
So to create a new object, choose one of the two to extend, and then create a class in objects.js extending it's class.
### Methods required for your class:
- `static type() -> string`
- Returns the type of the object (should be constant, non translatable).
@ -70,7 +72,7 @@ So to create a new object, choose one of the two to extend, and then create a cl
- Lists: `new P.List(<static type>, format = /^.+$/, label = '', forbidAdding = false)`
- Dictionaries: `new P.Dictionary(valueType: <static type>, keytType: <static type>, format = /^.+$/, preKeyLabel = '', postKeyLabel = ': ', forbidAdding = false)`
- Other objects: `new P.ObjectType(<object type. E.g. "Point", "ExecutableObject"...>)`
- In order to allow the properties to be properly translated, you shoudl apply the `QT_TRANSLATE_NOOP` macro to both property names (in the `prop` namespace) and comments (in the `comment` namespace). For example:
- In order to allow the properties to be properly translated, you should apply the `QT_TRANSLATE_NOOP` macro to both property names (in the `prop` namespace) and comments (in the `comment` namespace). For example:
```js
static properties() {return {
[QT_TRANSLATE_NOOP('prop','expression')]: 'Expression',
@ -118,7 +120,7 @@ Enum.XCursorValuePosition = new Enum(
om_0.name = getNewName('ω')
om_0.color = this.color
om_0.labelContent = 'name'
om_0.labelPosition = this.phase.execute() >= 0 ? 'bottom' : 'top'
om_0.labelPthis.drawLabel(canvas, ctx, this.labelPosition, canvas.x2px(this.labelX), canvas.y2px(this.execute(this.labelX)))osition = this.phase.execute() >= 0 ? 'bottom' : 'top'
history.addToHistory(new HistoryLib.CreateNewObject(om_0.name, 'Point', om_0.export()))
labelPosition = 'below'
}
@ -131,7 +133,11 @@ Enum.XCursorValuePosition = new Enum(
- `color` argument should be exported using the `toString()`, Expressions should be exported using `toEditableString`
- `getReadableString() -> string`
- Returns the string that should be displayed as help in the objects list and as the label when using the 'name + value' labelContent.
- You can make expressions easily displayable using it's `toString()` method.
- You can make expressions displayable using its `toString()` method.
- `getLatexString() -> string`
- Returns the LaTeX rendered that should be displayed as label on the canvas when using the 'name + value' labelContent.
- You can turn expressions and sets into LaTeX by using their `latexMarkup` properties.
- Similarly, variables should always be parsed with the helper function `Latex.variable` in order to render special characters (greek letters, sub and supscript numbers...)
- `execute(x = 1) -> number?`
- Only required for ExecutableObject.
- Returns the executed value of the object for a given x. Return null when current x cannot return a value.
@ -143,41 +149,12 @@ Enum.XCursorValuePosition = new Enum(
- Returns the simplified expression for a given x.
- `draw(canvas, ctx)`
- Main method for drawing the objects using the [Canvas Context2D](https://doc.qt.io/qt-5/qml-qtquick-context2d.html) methods and the additional methods described below.
- ExecutableObjects can draw their label if they have a labelX and labelPosition using the following code used in numerous other objects:
- ExecutableObjects can draw their label if they have a labelX and labelPosition using the the `drawLabel` object function:
```js
var text = this.getLabel()
ctx.font = `${canvas.textsize}px sans-serif`
var textSize = canvas.measureText(ctx, text)
var posX = canvas.x2px(this.labelX)
var posY = canvas.y2px(this.execute(this.labelX))
switch(this.labelPosition) {
case 'above':
canvas.drawVisibleText(ctx, text, posX-textSize.width/2, posY-textSize.height)
break;
case 'below':
canvas.drawVisibleText(ctx, text, posX-textSize.width/2, posY+textSize.height)
break;
case 'left':
canvas.drawVisibleText(ctx, text, posX-textSize.width, posY-textSize.height/2)
break;
case 'right':
canvas.drawVisibleText(ctx, text, posX, posY-textSize.height/2)
break;
case 'above-left':
canvas.drawVisibleText(ctx, text, posX-textSize.width, posY-textSize.height)
break;
case 'above-right':
canvas.drawVisibleText(ctx, text, posX, posY-textSize.height)
break;
case 'below-left':
canvas.drawVisibleText(ctx, text, posX-textSize.width, posY+textSize.height)
break;
case 'below-right':
canvas.drawVisibleText(ctx, text, posX, posY+textSize.height)
break;
}
this.drawLabel(canvas, ctx, this.labelPosition, canvas.x2px(this.labelX), canvas.y2px(this.execute(this.labelX)))
```
- You can also use `Function.drawFunction(canvas, ctx, expr, definitionDomain, destinationDomain, drawPoints = true, drawDash = true)` to rapidly draw a function created on the canvas.
### Other optional methods:
- `update()`
- Called every time a property of the object is changed.