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PO
 

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  1. PO
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    <p>I want to put here some information for those, who do separately drawing of picture and moving -zooming it.</p> <p>This may be useful when you want to store zooms and position of viewport.</p> <p>Here is drawer:</p> <pre><code>function redraw_ctx(){ self.ctx.clearRect(0,0,canvas_width, canvas_height) self.ctx.save() self.ctx.scale(self.data.zoom, self.data.zoom) // self.ctx.translate(self.data.position.left, self.data.position.top) // position second // Here We draw useful scene My task - image: self.ctx.drawImage(self.img ,0,0) // position 0,0 - we already prepared self.ctx.restore(); // Restore!!! } </code></pre> <p>Notice <strong>scale MUST be first</strong>.</p> <p>And here is zoomer: </p> <pre><code>function zoom(zf, px, py){ // zf - is a zoom factor, which in my case was one of (0.1, -0.1) // px, py coordinates - is point within canvas // eg. px = evt.clientX - canvas.offset().left // py = evt.clientY - canvas.offset().top var z = self.data.zoom; var x = self.data.position.left; var y = self.data.position.top; var nz = z + zf; // getting new zoom var K = (z*z + z*zf) // putting some magic var nx = x - ( (px*zf) / K ); var ny = y - ( (py*zf) / K); self.data.position.left = nx; // renew positions self.data.position.top = ny; self.data.zoom = nz; // ... and zoom self.redraw_ctx(); // redraw context } </code></pre> <p>and, of course, we would need a dragger:</p> <pre><code>this.my_cont.mousemove(function(evt){ if (is_drag){ var cur_pos = {x: evt.clientX - off.left, y: evt.clientY - off.top} var diff = {x: cur_pos.x - old_pos.x, y: cur_pos.y - old_pos.y} self.data.position.left += (diff.x / self.data.zoom); // we want to move the point of cursor strictly self.data.position.top += (diff.y / self.data.zoom); old_pos = cur_pos; self.redraw_ctx(); } }) </code></pre>
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    1. POZoom in on a point (using scale and translate)
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    1. USVasiliy Stavenko
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