Ad5001/LogarithmPlotter
Ad5001/LogarithmPlotter
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Starting async LaTeX rendering.

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This commit is contained in:
Adsooi 2024-09-16 22:05:17 +02:00
parent c9a597ea82
commit 8d6891c4f0
Signed by: Ad5001
GPG key ID: EF45F9C6AFE20160
5 changed files with 110 additions and 33 deletions
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8
LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/ObjectLists/ObjectRow.qml
View file

@ -100,10 +100,10 @@ Item {
anchors.left: parent.left
visible: Modules.Latex.enabled
property double depth: Screen.devicePixelRatio
property var ltxInfo: visible ? Latex.render(obj.getLatexString(), depth*(parent.font.pixelSize+2), parent.color).split(",") : ["","0","0"]
source: visible ? ltxInfo[0] : ""
width: parseInt(ltxInfo[1])/depth
height: parseInt(ltxInfo[2])/depth
property var ltxInfo: visible ? Modules.Latex.renderSync(obj.getLatexString(), depth*(parent.font.pixelSize+2), parent.color) : { source: "", width: 0, height: 0 }
source: visible ? ltxInfo.source : ""
width: ltxInfo.width/depth
height: ltxInfo.height/depth
}
MouseArea {

24
LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/canvas.mjs
View file

@ -19,6 +19,7 @@
import { Module } from "./modules.mjs"
import { textsup } from "./utils.mjs"
import { Expression } from "./mathlib.mjs"
import Latex from "./math/latex.mjs"
class CanvasAPI extends Module {
@ -168,6 +169,8 @@ class CanvasAPI extends Module {
obj.draw(this)
} catch(e) {
// Drawing throws an error. Generally, it's due to a new modification (or the opening of a file)
console.error(e)
console.log(e.stack)
this._drawingErrorDialog.showDialog(objType, obj.name, e.message)
Modules.History.undo()
}
@ -452,24 +455,25 @@ class CanvasAPI extends Module {
* Renders latex markup ltxText to an image and loads it. Returns a dictionary with three values: source, width and height.
* @param {string} ltxText
* @param {string} color
* @param {function({width: number, height: number, source: string})} callback
* @param {function(LatexRenderResult|{width: number, height: number, source: string})} callback
*/
renderLatexImage(ltxText, color, callback) {
let [ltxSrc, ltxWidth, ltxHeight] = Latex.render(ltxText, this.textsize, color).split(",")
let imgData = {
"source": ltxSrc,
"width": parseFloat(ltxWidth),
"height": parseFloat(ltxHeight)
};
if(!this._canvas.isImageLoaded(ltxSrc) && !this._canvas.isImageLoading(ltxSrc)){
const onRendered = (imgData) => {
if(!this._canvas.isImageLoaded(imgData.source) && !this._canvas.isImageLoading(imgData.source)){
// Wait until the image is loaded to callback.
this._canvas.loadImage(ltxSrc)
this._canvas.imageLoaders[ltxSrc] = [callback, imgData]
this._canvas.loadImage(imgData.source)
this._canvas.imageLoaders[imgData.source] = [callback, imgData]
} else {
// Callback directly
callback(imgData)
}
}
const prerendered = Latex.findPrerendered(ltxText, this.textsize, color)
if(prerendered !== null)
onRendered(prerendered)
else
Latex.requestAsyncRender(ltxText, this.textsize, color).then(onRendered)
}
//
// Context methods

6
LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/history/common.mjs
View file

@ -115,12 +115,12 @@ export class Action {
if(!Latex.enabled)
throw new Error("Cannot render an item as LaTeX when LaTeX is disabled.")
let imgDepth = Modules.History.imageDepth
let [src, width, height] = Latex.render(
let { source, width, height } = Latex.renderSync(
latexString,
imgDepth * (Modules.History.fontSize + 2),
Modules.History.themeTextColor
).split(",")
return `<img src="${src}" width="${parseInt(width)/imgDepth}" height="${parseInt(height)/imgDepth}" style="vertical-align: middle"/>`
)
return `<img src="${source}" width="${width/imgDepth}" height="${height/imgDepth}" style="vertical-align: middle"/>`
}
/**

59
LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/math/latex.mjs
View file

@ -39,6 +39,20 @@ const equivalchars = ["\\alpha","\\beta","\\gamma","\\delta","\\epsilon","\\zeta
"{}_{4}","{}_{5}","{}_{6}","{}_{7}","{}_{8}","{}_{9}","{}_{0}",
"\\pi", "\\infty"]
/**
* Class containing the result of a LaTeX render.
*
* @property {string} source - Exported PNG file
* @property {number} width
* @property {number} height
*/
class LatexRenderResult {
constructor(source, width, height) {
this.source = source
this.width = parseFloat(width)
this.height = parseFloat(height)
}
}
class LatexAPI extends Module {
constructor() {
@ -50,11 +64,50 @@ class LatexAPI extends Module {
* true if latex has been enabled by the user, false otherwise.
*/
this.enabled = Helper.getSettingBool("enable_latex")
}
/**
* Mirror method for Python object.
* @type {function(string, number, string): string}.
* Prepares and renders a latex string into a png file.
*
* @param {string} markup - LaTeX markup to render.
* @param {number} fontSize - Font size (in pt) to render.
* @param {color} color - Color of the text to render.
* @returns {LatexRenderResult}
*/
this.render = Latex.render
renderSync(markup, fontSize, color) {
let args = Latex.render(markup, fontSize, color).split(",")
return new LatexRenderResult(...args)
}
/**
* Checks if the given markup (with given font size and color) has already been
* rendered, and if so, returns its data. Otherwise, returns null.
*
* @param {string} markup - LaTeX markup to render.
* @param {number} fontSize - Font size (in pt) to render.
* @param {color} color - Color of the text to render.
* @returns {LatexRenderResult|null}
*/
findPrerendered(markup, fontSize, color) {
const data = Latex.findPrerendered(markup, fontSize, color)
let ret = null
if(data !== "")
ret = new LatexRenderResult(...data.split(","))
return ret
}
/**
* Prepares and renders a latex string into a png file asynchronously.
*
* @param {string} markup - LaTeX markup to render.
* @param {number} fontSize - Font size (in pt) to render.
* @param {color} color - Color of the text to render.
* @returns {Promize<LatexRenderResult>}
*/
requestAsyncRender(markup, fontSize, color) {
return new Promise(resolve => {
resolve(this.renderSync(markup, fontSize, color))
})
}
/**

26
LogarithmPlotter/util/latex.py
View file

@ -93,14 +93,12 @@ class Latex(QObject):
valid_install = False # Should have sent an error message if failed to render
return valid_install
@Slot(str, float, QColor, result=str)
def render(self, latex_markup: str, font_size: float, color: QColor) -> str:
"""
Prepares and renders a latex string into a png file.
"""
markup_hash = "render" + str(hash(latex_markup))
export_path = path.join(self.tempdir.name, f'{markup_hash}_{int(font_size)}_{color.rgb()}')
markup_hash, export_path = self.create_export_path(latex_markup, font_size, color)
if self.latexSupported and not path.exists(export_path + ".png"):
print("Rendering", latex_markup, export_path)
# Generating file
@ -122,6 +120,28 @@ class Latex(QObject):
# Small hack, not very optimized since we load the image twice, but you can't pass a QImage to QML and expect it to be loaded
return f'{export_path}.png,{img.width()},{img.height()}'
@Slot(str, float, QColor, result=str)
def findPrerendered(self, latex_markup: str, font_size: float, color: QColor):
"""
Finds a prerendered image and returns its data if possible, and an empty string if not.
"""
markup_hash, export_path = self.create_export_path(latex_markup, font_size, color)
data = ""
if path.exists(export_path + ".png"):
img = QImage(export_path)
data = f'{export_path}.png,{img.width()},{img.height()}'
return data
def create_export_path(self, latex_markup: str, font_size: float, color: QColor):
"""
Standardizes export path for renders.
"""
markup_hash = "render" + str(hash(latex_markup))
export_path = path.join(self.tempdir.name, f'{markup_hash}_{int(font_size)}_{color.rgb()}')
return markup_hash, export_path
def create_latex_doc(self, export_path: str, latex_markup: str):
"""
Creates a temporary latex document with base file_hash as file name and a given expression markup latex_markup.