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add option to draw grid to image on download

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This commit is contained in:
raphael 2020-05-22 15:24:11 +02:00
parent 22126840e9
commit 4134c4130a
5 changed files with 113 additions and 71 deletions
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3
config.default.yml
View File

@ -28,6 +28,9 @@ frontend:
# Image download format, can be "png", "jpeg" (or "webp" -> only working on chrome) -- string
imageDownloadFormat: "png"
# draw the background grid to images on download ? (If True, even PNGs are also not transparent anymore) -- boolean
drawBackgroundGrid: false
# Frontend performance tweaks
performance:
# Refresh frequency of the debug / info div (in Hz i.e. /s) -- number

3
scripts/config/config-schema.json
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@ -51,6 +51,9 @@
"imageDownloadFormat": {
"type": "string"
},
"drawBackgroundGrid": {
"type": "boolean"
},
"performance": {
"type": "object",
"additionalProperties": false,

78
src/js/main.js
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@ -285,21 +285,27 @@ function initWhiteboard() {
// save image as imgae
$("#saveAsImageBtn").click(function () {
whiteboard.getImageDataBase64(ConfigService.imageDownloadFormat, function (imgData) {
var w = window.open("about:blank"); //Firefox will not allow downloads without extra window
setTimeout(function () {
//FireFox seems to require a setTimeout for this to work.
var a = document.createElement("a");
a.href = imgData;
a.download = "whiteboard." + ConfigService.imageDownloadFormat;
w.document.body.appendChild(a);
a.click();
w.document.body.removeChild(a);
whiteboard.getImageDataBase64(
{
imageFormat: ConfigService.imageDownloadFormat,
drawBackgroundGrid: ConfigService.drawBackgroundGrid,
},
function (imgData) {
var w = window.open("about:blank"); //Firefox will not allow downloads without extra window
setTimeout(function () {
w.close();
}, 100);
}, 0);
});
//FireFox seems to require a setTimeout for this to work.
var a = document.createElement("a");
a.href = imgData;
a.download = "whiteboard." + ConfigService.imageDownloadFormat;
w.document.body.appendChild(a);
a.click();
w.document.body.removeChild(a);
setTimeout(function () {
w.close();
}, 100);
}, 0);
}
);
});
// save image to json containing steps
@ -380,26 +386,30 @@ function initWhiteboard() {
localStorage.setItem("webdavusername", webdavusername);
var webdavpassword = webDavHtml.find(".webdavpassword").val();
localStorage.setItem("webdavpassword", webdavpassword);
whiteboard.getImageDataBase64(ConfigService.imageDownloadFormat, function (
base64data
) {
var webdavaccess = {
webdavserver: webdavserver,
webdavpath: webdavpath,
webdavusername: webdavusername,
webdavpassword: webdavpassword,
};
webDavHtml.find(".loadingWebdavText").show();
webDavHtml.find(".webdavUploadBtn").hide();
saveWhiteboardToWebdav(base64data, webdavaccess, function (err) {
if (err) {
webDavHtml.find(".loadingWebdavText").hide();
webDavHtml.find(".webdavUploadBtn").show();
} else {
webDavHtml.parents(".basicalert").remove();
}
});
});
whiteboard.getImageDataBase64(
{
imageFormat: ConfigService.imageDownloadFormat,
drawBackgroundGrid: ConfigService.drawBackgroundGrid,
},
function (base64data) {
var webdavaccess = {
webdavserver: webdavserver,
webdavpath: webdavpath,
webdavusername: webdavusername,
webdavpassword: webdavpassword,
};
webDavHtml.find(".loadingWebdavText").show();
webDavHtml.find(".webdavUploadBtn").hide();
saveWhiteboardToWebdav(base64data, webdavaccess, function (err) {
if (err) {
webDavHtml.find(".loadingWebdavText").hide();
webDavHtml.find(".webdavUploadBtn").show();
} else {
webDavHtml.parents(".basicalert").remove();
}
});
}
);
});
showBasicAlert(webDavHtml, {
header: "Save to Webdav",

10
src/js/services/ConfigService.js
View File

@ -40,6 +40,14 @@ class ConfigService {
return this.#imageDownloadFormat;
}
/**
* @type {boolean}
*/
#drawBackgroundGrid = false;
get drawBackgroundGrid() {
return this.#drawBackgroundGrid;
}
/**
* @type {{minDistDelta: number, minTimeDelta: number}}
*/
@ -69,12 +77,14 @@ class ConfigService {
onWhiteboardLoad,
showSmallestScreenIndicator,
imageDownloadFormat,
drawBackgroundGrid,
performance,
} = common;
this.#onWhiteboardLoad = onWhiteboardLoad;
this.#showSmallestScreenIndicator = showSmallestScreenIndicator;
this.#imageDownloadFormat = imageDownloadFormat;
this.#drawBackgroundGrid = drawBackgroundGrid;
this.#refreshInfoInterval = 1000 / performance.refreshInfoFreq;
console.log("Whiteboard config from server:", configFromServer, "parsed:", this);

90
src/js/whiteboard.js
View File

@ -1173,62 +1173,78 @@ const whiteboard = {
refreshUserBadges() {
this.cursorContainer.find(".userbadge").remove();
},
getImageDataBase64(format, callback) {
getImageDataBase64(options, callback) {
var _this = this;
var width = this.mouseOverlay.width();
var height = this.mouseOverlay.height();
var copyCanvas = document.createElement("canvas");
copyCanvas.width = width;
copyCanvas.height = height;
var ctx = copyCanvas.getContext("2d");
var imageFormat = options.imageFormat || "png";
var drawBackgroundGrid = options.drawBackgroundGrid || false;
$.each(_this.imgContainer.find("img"), function () {
//Draw Backgroundimages to the export canvas
var width = $(this).width();
var height = $(this).height();
var p = $(this).position();
var left = Math.round(p.left * 100) / 100;
var top = Math.round(p.top * 100) / 100;
ctx.drawImage(this, left, top, width, height);
});
var brackGroundImg = new Image();
brackGroundImg.src = _this.settings.backgroundGridUrl;
var destCtx = copyCanvas.getContext("2d"); //Draw the maincanvas to the exportcanvas
if (format === "jpeg") {
//Set white background for jpeg images
destCtx.fillStyle = "#FFFFFF";
destCtx.fillRect(0, 0, width, height);
}
destCtx.drawImage(this.canvas, 0, 0);
brackGroundImg.onload = function () {
var destCtx = copyCanvas.getContext("2d"); //Draw the maincanvas to the exportcanvas
var textBoxCnt = 0;
$.each($(".textBox"), function () {
//Draw the text on top
textBoxCnt++;
if (imageFormat === "jpeg") {
//Set white background for jpeg images
destCtx.fillStyle = "#FFFFFF";
destCtx.fillRect(0, 0, width, height);
}
var textContainer = $(this);
var p = textContainer.position();
if (drawBackgroundGrid) {
var ptrn = destCtx.createPattern(brackGroundImg, "repeat"); // Create a pattern with this image, and set it to "repeat".
destCtx.fillStyle = ptrn;
destCtx.fillRect(0, 0, copyCanvas.width, copyCanvas.height); // context.fillRect(x, y, width, height);
}
var left = Math.round(p.left * 100) / 100;
var top = Math.round(p.top * 100) / 100;
$.each(_this.imgContainer.find("img"), function () {
//Draw Backgroundimages to the export canvas
var width = $(this).width();
var height = $(this).height();
var p = $(this).position();
var left = Math.round(p.left * 100) / 100;
var top = Math.round(p.top * 100) / 100;
destCtx.drawImage(this, left, top, width, height);
});
html2canvas(this, { backgroundColor: "rgba(0, 0, 0, 0)", removeContainer: true }).then(
function (canvas) {
//Copy drawings
destCtx.drawImage(_this.canvas, 0, 0);
var textBoxCnt = 0;
$.each($(".textBox"), function () {
//Draw the text on top
textBoxCnt++;
var textContainer = $(this);
var p = textContainer.position();
var left = Math.round(p.left * 100) / 100;
var top = Math.round(p.top * 100) / 100;
html2canvas(this, {
backgroundColor: "rgba(0, 0, 0, 0)",
removeContainer: true,
}).then(function (canvas) {
console.log("canvas", canvas);
destCtx.drawImage(canvas, left, top);
textBoxCnt--;
checkForReturn();
}
);
});
});
});
function checkForReturn() {
if (textBoxCnt == 0) {
var url = copyCanvas.toDataURL("image/" + format);
callback(url);
function checkForReturn() {
if (textBoxCnt == 0) {
var url = copyCanvas.toDataURL("image/" + imageFormat);
callback(url);
}
}
}
checkForReturn();
checkForReturn();
};
},
getImageDataJson() {
var sendObj = [];