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Add zoomToFit feature #143

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Add zoomToFit feature #143

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5761b46
Add zoomToFit feature
ystreibel Nov 13, 2019
5203a04
Merge branch 'master' into master
ystreibel Jun 30, 2021
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1 change: 1 addition & 0 deletions index.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,7 @@ declare module "panzoom" {
) => void;
getTransform: () => Transform;
showRectangle: (rect: ClientRect) => void;
zoomToFit: (ui: any) => void;
pause: () => void;
resume: () => void;
isPaused: () => boolean;
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57 changes: 41 additions & 16 deletions index.js
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Expand Up @@ -119,6 +119,7 @@ function createPanZoom(domElement, options) {
smoothZoom: smoothZoom,
smoothZoomAbs: smoothZoomAbs,
showRectangle: showRectangle,
zoomToFit: zoomToFit,

pause: pause,
resume: resume,
Expand Down Expand Up @@ -444,26 +445,50 @@ function createPanZoom(domElement, options) {
internalMoveBy(x - transform.x, y - transform.y, true);
}

function internalMoveBy(dx, dy, smooth) {
if (!smooth) {
return moveBy(dx, dy);
}
function zoomToFit(ui) {
var parent = ui.ownerSVGElement
if (!parent) throw new Error('ui element is required to be within the scene')

if (moveByAnimation) moveByAnimation.cancel();
// TODO: should i use controller's screen CTM?
var clientRect = ui.getBoundingClientRect()
var cx = clientRect.left + clientRect.width/2
var cy = clientRect.top + clientRect.height/2

var from = { x: 0, y: 0 };
var to = { x: dx, y: dy };
var lastX = 0;
var lastY = 0;
var container = parent.getBoundingClientRect()
var dx = container.width/2 - cx
var dy = container.height/2 - cy

moveByAnimation = animate(from, to, {
step: function (v) {
moveBy(v.x - lastX, v.y - lastY);
var wx = window.innerWidth / 2;
var wy = window.innerHeight / 2;

lastX = v.x;
lastY = v.y;
}
});
var fitRatio = Math.min(wx / (clientRect.width / 2), wy / (clientRect.height / 2));

internalMoveBy(dx, dy, true, () => {smoothZoom(wx , wy, fitRatio)});

}

function internalMoveBy(dx, dy, smooth, done) {
if (!smooth) {
moveBy(dx, dy);
done();
} else {
if (moveByAnimation) moveByAnimation.cancel()

var from = { x: 0, y: 0 }
var to = { x: dx, y : dy }
var lastX = 0
var lastY = 0

moveByAnimation = animate(from, to, {
step: function(v) {
moveBy(v.x - lastX, v.y - lastY)

lastX = v.x
lastY = v.y
},
done: done
})
}
}

function scroll(x, y) {
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