Commit 1c95f1b

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Merge pull request matplotlib#30543 from LangQi99/feat/zoom

ENH: support x/y-axis zoom

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doc/release/next_whats_new
- scroll_to_zoom.rst
lib/matplotlib
- backend_bases.py

2 files changed

+18

-6

lines changed

`‎doc/release/next_whats_new/scroll_to_zoom.rst‎`

Lines changed: 2 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -2,7 +2,8 @@ Zooming using mouse wheel`
`2`	`2`	`~~~~~~~~~~~~~~~~~~~~~~~~~`
`3`	`3`
`4`	`4`	``Ctrl+MouseWheel`` can be used to zoom in the plot windows.
	`5`	+Additionally, ``x+MouseWheel`` zooms only the x-axis and ``y+MouseWheel`` zooms only the y-axis.
`5`	`6`
`6`		`-The zoom focusses on the mouse pointer, and keeps the aspect ratio of the axes.`
	`7`	+The zoom focusses on the mouse pointer. With ``Ctrl``, the axes aspect ratio is kept; with ``x`` or ``y``, only the respective axis is scaled.
`7`	`8`
`8`	`9`	`Zooming is currently only supported on rectilinear Axes.`

`‎lib/matplotlib/backend_bases.py‎`

Lines changed: 16 additions & 5 deletions

Original file line number	Diff line number	Diff line change
`@@ -2592,7 +2592,7 @@ def scroll_handler(event, canvas=None, toolbar=None):`
`2592`	`2592`	`# is required for interactive navigation.`
`2593`	`2593`	`return`
`2594`	`2594`
`2595`		`- if event.key =="control": # zoom towards the mouse position`
	`2595`	`+ if event.key in {"control", "x", "y"}: # zoom towards the mouse position`
`2596`	`2596`	`toolbar.push_current()`
`2597`	`2597`
`2598`	`2598`	`xmin, xmax = ax.get_xlim()`
`@@ -2604,10 +2604,21 @@ def scroll_handler(event, canvas=None, toolbar=None):`
`2604`	`2604`	`x, y = ax.transScale.transform((event.xdata, event.ydata))`
`2605`	`2605`
`2606`	`2606`	`scale_factor = 0.85 ** event.step`
`2607`		`- new_xmin = x - (x - xmin) * scale_factor`
`2608`		`- new_xmax = x + (xmax - x) * scale_factor`
`2609`		`- new_ymin = y - (y - ymin) * scale_factor`
`2610`		`- new_ymax = y + (ymax - y) * scale_factor`
	`2607`	`+ # Determine which axes to scale based on key`
	`2608`	`+ zoom_x = event.key in {"control", "x"}`
	`2609`	`+ zoom_y = event.key in {"control", "y"}`
	`2610`	`+`
	`2611`	`+ if zoom_x:`
	`2612`	`+ new_xmin = x - (x - xmin) * scale_factor`
	`2613`	`+ new_xmax = x + (xmax - x) * scale_factor`
	`2614`	`+ else:`
	`2615`	`+ new_xmin, new_xmax = xmin, xmax`
	`2616`	`+`
	`2617`	`+ if zoom_y:`
	`2618`	`+ new_ymin = y - (y - ymin) * scale_factor`
	`2619`	`+ new_ymax = y + (ymax - y) * scale_factor`
	`2620`	`+ else:`
	`2621`	`+ new_ymin, new_ymax = ymin, ymax`
`2611`	`2622`
`2612`	`2623`	`inv_scale = ax.transScale.inverted()`
`2613`	`2624`	`(new_xmin, new_ymin), (new_xmax, new_ymax) = inv_scale.transform(`

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Commit 1c95f1b

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2 files changed

2 files changed

`‎doc/release/next_whats_new/scroll_to_zoom.rst‎`

`‎lib/matplotlib/backend_bases.py‎`

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