image support

web/index.html

@@ -14,7 +14,8 @@
     </tbody>
     <tfoot>
     <td>
-        <input type="button" value="Add Text" id="add"/>
+        <input type="button" value="Add Text" id="add-text"/>
+        <input type="button" value="Add Image" id="add-image"/>
     </td>
     </tfoot>
 </table>

web/label.js

@@ -3,7 +3,8 @@ const elementsTable = document.getElementById('elements');
 const preview = document.getElementById('preview');
 const renderCtx = preview.getContext("2d");
 const elementsTableBody = elementsTable.getElementsByTagName('tbody')[0];
-const addButton = document.getElementById('add');
+const addTextButton = document.getElementById('add-text');
+const addImageButton = document.getElementById('add-image');
 /** @type HTMLInputElement printButton */
 const printButton = document.getElementById('print');
 const widthInput = document.getElementById('canvas-width');
@@ -14,6 +15,8 @@ let defaultFontSize = 24;
 let backgroundColor = "white";
 let textColor = "white";
 
+let images = new Map();
+
 const nextElementId = () => {
     let rows = elementsTableBody.getElementsByTagName('tr');
     if (rows.length === 0) {
@@ -23,20 +26,7 @@ const nextElementId = () => {
     }
 };
 
-const addElement = () => {
+const addElementControls = (row) => {
-    let id = nextElementId();
-    let row = document.createElement('tr');
-    row.dataset.elementId = id;
-
-
-    let textCol = document.createElement('td');
-    textCol.classList.add('text');
-    let textInput = document.createElement('input');
-    textInput.type = "text";
-    textInput.addEventListener('input', render);
-    textCol.appendChild(textInput);
-    row.appendChild(textCol);
-
     {
         let sizeCol = document.createElement('td');
         sizeCol.classList.add('size');
@@ -44,7 +34,7 @@ const addElement = () => {
         sizeInput.addEventListener('input', render);
         sizeInput.type = "number";
         sizeInput.value = defaultFontSize.toString();
-        sizeCol.appendChild(document.createTextNode("Front size"))
+        sizeCol.appendChild(document.createTextNode("Size"))
         sizeCol.appendChild(sizeInput);
         row.appendChild(sizeCol);
     }
@@ -55,12 +45,12 @@ const addElement = () => {
         let posInputX = document.createElement('input');
         posInputX.addEventListener('input', render);
         posInputX.type = "number";
-        posInputX.value = "2";
+        posInputX.value = "0";
         posInputX.classList.add('pos_x');
         let posInputY = document.createElement('input');
         posInputY.addEventListener('input', render);
         posInputY.type = "number";
-        posInputY.value = "2";
+        posInputY.value = "0";
         posInputY.classList.add('pos_y');
         posCol.appendChild(document.createTextNode("Position"))
         posCol.appendChild(posInputX);
@@ -78,15 +68,67 @@ const addElement = () => {
         removeCol.appendChild(removeInput);
         row.appendChild(removeCol);
     }
+}
 
+const addTextElement = () => {
+    let id = nextElementId();
+    let row = document.createElement('tr');
+    row.dataset.elementId = id;
+    row.dataset.type = 'text';
+
+
+    let textCol = document.createElement('td');
+    textCol.classList.add('text');
+    let textInput = document.createElement('input');
+    textInput.type = "text";
+    textInput.addEventListener('input', render);
+    textCol.appendChild(textInput);
+    row.appendChild(textCol);
+
+    addElementControls(row);
     elementsTableBody.appendChild(row);
 
     textInput.focus();
 };
 
+const loadImage = (event) => {
+    /** @type HTMLInputElement input */
+    const input = event.target;
+    const row = event.target.parentElement.parentElement;
+    let file = input.files[0];
+    if (file.type.startsWith('image')) {
+        let image = row.getElementsByTagName('img')[0];
+        image.addEventListener('load', render);
+        image.src = URL.createObjectURL(file);
+    }
+};
+
+const addImageElement = () => {
+    let id = nextElementId();
+    let row = document.createElement('tr');
+    row.dataset.elementId = id;
+    row.dataset.type = 'image';
+
+
+    let imageCol = document.createElement('td');
+    imageCol.classList.add('image');
+    let imageInput = document.createElement('input');
+    imageInput.type = 'file';
+    imageInput.addEventListener('change', loadImage);
+    let imageThumb = document.createElement('img');
+    imageCol.appendChild(imageInput);
+    imageCol.appendChild(imageThumb);
+    row.appendChild(imageCol);
+
+    addElementControls(row);
+    elementsTableBody.appendChild(row);
+};
+
 const removeElement = (event) => {
     let row = event.target.parentElement.parentElement;
+    let id = row.dataset.elementId;
     row.remove();
+    images.delete(id);
     render();
 };
 
@@ -94,12 +136,23 @@ const getElements = () => {
     let rows = elementsTableBody.getElementsByTagName('tr');
     let elements = [];
     for (let row of rows) {
+        if (row.dataset.type === 'text') {
             elements.push({
+                type: 'text',
                 text: row.querySelector('.text input').value,
                 size: parseInt(row.querySelector('.size input').value, 10),
                 x: parseInt(row.querySelector('.pos_x').value, 10),
                 y: parseInt(row.querySelector('.pos_y').value, 10),
             });
+        } else if (row.dataset.type === 'image') {
+            elements.push({
+                type: 'image',
+                image: row.getElementsByTagName('img')[0],
+                size: parseInt(row.querySelector('.size input').value, 10),
+                x: parseInt(row.querySelector('.pos_x').value, 10),
+                y: parseInt(row.querySelector('.pos_y').value, 10),
+            });
+        }
     }
     return elements;
 }
@@ -108,13 +161,26 @@ const render = () => {
     let elements = getElements();
     let width = preview.width;
     let height = preview.height;
+    renderCtx.filter = '';
     renderCtx.fillStyle = backgroundColor;
     renderCtx.fillRect(0, 0, width, height);
 
     renderCtx.fillStyle = textColor;
     for (let element of elements) {
+        if (element.type === 'text') {
+            renderCtx.filter = '';
             renderCtx.font = `${element.size}px serif`;
-        renderCtx.fillText(element.text, element.x, height - element.y);
+            let textSize = renderCtx.measureText(element.text);
+            let textHeight = textSize.fontBoundingBoxAscent - textSize.emHeightDescent;
+            renderCtx.fillText(element.text, element.x, element.y + textHeight);
+        } else if (element.type === 'image' && element.image.naturalWidth > 0) {
+            renderCtx.filter = 'grayscale() saturate(0%) brightness(70%) contrast(1000%)';
+            if (textColor === 'white') {
+                renderCtx.filter = renderCtx.filter + ' invert()';
+            }
+            let ratio = element.image.naturalWidth /  element.image.naturalHeight;
+            renderCtx.drawImage(element.image, element.x, element.y, element.size * ratio, element.size);
+        }
     }
 }
 
@@ -143,7 +209,8 @@ const print = () => {
     }, 'image/png');
 };
 
-addButton.addEventListener('click', addElement);
+addTextButton.addEventListener('click', addTextElement);
+addImageButton.addEventListener('click', addImageElement);
 printButton.addEventListener('click', print);
 widthInput.addEventListener('input', resize);
 
@@ -168,5 +235,5 @@ fetch(apiRoot + '/status')
         textColor = status.text_color;
         tapeWidthMM = status.media_width;
         render();
-        addElement();
+        addTextElement();
     })

web/style.css

@@ -7,6 +7,7 @@
     :root {
         --background-color: #1e1e1e;
         --font-color: #fff;
+        color-scheme: dark;
     }
 }
 
@@ -19,4 +20,9 @@ body, input {
     .pos input {
         width: 60px;
     }
+
+    .image img {
+        height: 32px;
+        width: auto;
+    }
 }