X-Git-Url: http://git.shiar.nl/sheet.git/blobdiff_plain/98181d5e59c9ea4c5c84665ed8892af8011e30ad..a93c5c61b18192c5f74256e3cb18e7f1cd2034d5:/word/editor.js

diff --git a/word/editor.js b/word/editor.js
index 0e54c62..4eb2382 100644
--- a/word/editor.js
+++ b/word/editor.js
@@ -120,26 +120,107 @@ document.addEventListener('DOMContentLoaded', () => {
 	let thumbpreview = document.getElementById('convertpreview');
 	if (thumbpreview && imgpreview) {
 		thumbpreview.onclick = e => {
+			thumbpreview.onclick = null; // setup once
 			const cropinput = document.getElementById('crop32');
-			let border = { width: 600, height: 400 };
-			let crop = new Croppie(thumbpreview, {
-				boundary: { width: border.width * 1.3, height: border.height * 1.2 },
-				viewport: border,
-				update: e => {
-					cropinput.value = e.points.map((pos, axis) => {
-						Math.round(1000 * pos / (axis % 2 ? border.height : border.width))
-					}).join(',');
-				},
-			});
-			crop.bind({
-				url: imgpreview.src,
-				points: cropinput.value.split(/[^0-9]/).map((rel, axis) => {
-					return rel * (axis % 2 ? border.height : border.width) / 1000
-				}),
-			});
-			crop.elements.overlay.addEventListener('dblclick', e => {
-				crop.destroy();
-			});
+			const imgselect = thumbpreview.children[0];
+			const canvas = [thumbpreview.clientWidth, thumbpreview.clientHeight];
+			const border = [canvas[0], canvas[0] * imgpreview.height / imgpreview.width];
+			const minscale = Math.max(1, canvas[1] / border[1]); // 100% or fit width
+			let crop = cropinput.value.split(/[^0-9.]/).map(pos => pos / 1000);
+			let scale = 1 / (crop[2] - crop[0]) || minscale;
+			crop.push(0); // defined y dimension
+			crop.splice(2); // end coordinates applied to zoom
+			crop = crop.map((rel, axis) => rel * border[axis % 2] * scale);
+
+			let drag, pinch;
+			function applydrag(e) {
+				const touch = e.touches ? e.touches[0] : e;
+				let pos = [touch.pageX, touch.pageY];
+				if (e.type === 'touchmove' && e.touches.length > 1) {
+					// distance to second point
+					pos[0] -= e.touches[1].pageX;
+					pos[1] -= e.touches[1].pageY;
+					const span = Math.sqrt(pos[0]**2 + pos[1]**2);
+					if (pinch) {
+						cropzoom(.01 * (span - pinch));
+					}
+					pinch = span;
+					return;
+				}
+				if (drag) {
+					// apply drag delta to crop position
+					crop[0] += drag[0] - pos[0];
+					crop[1] += drag[1] - pos[1];
+					recrop();
+				}
+				drag = pos;
+			}
+
+			function recrop() {
+				[0, 1].forEach(axis => {
+					if (crop[axis] > border[axis] * scale - canvas[axis]) {
+						crop[axis] = border[axis] * scale - canvas[axis]; // max bound
+					}
+					if (crop[axis] < 0) {
+						crop[axis] = 0; // min bound
+					}
+				});
+				imgselect.style.left = -crop[0]+'px';
+				imgselect.style.top  = -crop[1]+'px';
+				imgselect.style.width = (scale * 100)+'%';
+				cropinput.value = [
+					crop[0] / border[0],
+					crop[1] / border[1],
+					(crop[0] + canvas[0]) / border[0],
+					(crop[1] + canvas[1]) / border[1],
+				].map(pos => Math.round(1000 * pos / scale));
+			}
+
+			function cropzoom(delta) {
+				if (scale + delta < minscale) {
+					delta = minscale - scale; // scale = 1
+				}
+				[0, 1].forEach(axis => {
+					// same area center at altered scale
+					crop[axis] += (crop[axis] + border[axis] / 2) / scale * delta;
+				});
+				scale += delta;
+				recrop();
+			}
+
+			imgselect.src = imgpreview.src;
+			imgselect.style.cursor = 'grab';
+			imgselect.style.position = 'absolute';
+			recrop();
+
+			imgselect.ontouchstart =
+			imgselect.onmousedown = e => {
+				e.preventDefault();
+				drag = pinch = false;
+				applydrag(e);
+				imgselect.style.cursor = 'grabbing';
+				window.ontouchmove =
+				window.onmousemove = e => {
+					e.preventDefault();
+					applydrag(e);
+				};
+				window.ontouchend =
+				window.onmouseup = e => {
+					e.preventDefault();
+					imgselect.style.cursor = 'grab';
+					window.ontouchmove = window.ontouchend =
+					window.onmousemove = window.onmouseup = null;
+				};
+			};
+
+			imgselect.onwheel = e => {
+				e.preventDefault();
+				let delta = (-e.deltaY || e.wheelDelta) * .001 * scale;
+				if (e.deltaMode == 1) { // DOM_DELTA_LINE
+					delta *= 18; // convert number of lines to pixels
+				}
+				cropzoom(delta);
+			};
 		};
 	}