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Added basic zoom-recenter

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This commit is contained in:
Max Robinson
2021-01-12 17:10:22 -07:00
parent 22436f6b33
commit c79c3e54e5
2 changed files with 15 additions and 2 deletions
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15
src/Controllers/EnvironmentController.js
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@@ -20,14 +20,25 @@ class EnvironmentController extends CanvasController{
const el = document.querySelector('#env-canvas');
el.onwheel = function zoom(event) {
event.preventDefault();
var sign = -1*Math.sign(event.deltaY);
var cur_top = parseInt($('#env-canvas').css('top'));
var cur_left = parseInt($('#env-canvas').css('left'));
var diff_x = ((-cur_left/this.scale+this.canvas.width/2) - this.mouse_x)*this.scale/2*sign;
var diff_y = ((-cur_top/this.scale+this.canvas.height/2) - this.mouse_y)*this.scale/2*sign;
$('#env-canvas').css('top', (cur_top+diff_y)+'px');
$('#env-canvas').css('left', (cur_left+diff_x)+'px');
// Restrict scale
scale = Math.max(0.5, scale+(sign*zoom_speed));
scale = Math.max(0.5, this.scale+(sign*zoom_speed));
// Apply scale transform
el.style.transform = `scale(${scale})`;
this.scale = scale;
}.bind(this);
}
@@ -45,6 +56,8 @@ class EnvironmentController extends CanvasController{
mouseMove() {
this.performModeAction();
var cur_top = parseInt($('#env-canvas').css('top'))/this.scale;
var cur_left = parseInt($('#env-canvas').css('left'))/this.scale;
}
mouseDown() {