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use exponential increments for zooming

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Pascal Sommer 2021-02-26 22:32:37 +01:00 committed by Harry Jeffery
parent 2c0f10a91b
commit 8e46aa0238
1 changed files with 3 additions and 2 deletions
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5
src/viewport.c
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@ -2,6 +2,7 @@
#include <stdbool.h>
#include <stdlib.h>
#include <math.h>
struct imv_viewport {
double scale;
@ -159,8 +160,8 @@ void imv_viewport_zoom(struct imv_viewport *view, const struct imv_image *image,
const int wc_x = view->buffer.width/2;
const int wc_y = view->buffer.height/2;
double delta_scale = 0.04 * view->buffer.width * amount / image_width;
view->scale += delta_scale;
const double scale_factor = exp(0.04 * view->buffer.width * amount / image_width);
view->scale *= scale_factor;
const double min_scale = 0.1;
const double max_scale = 100;