clip

Has anyone here have done clipping an image within an image? I've seen so far about clipping on the canvas but are all regular shapes(rectangle, circle, etc...). It would be nice if some have actually done it. P.S. with fabric.js or just the regular canvas. Sure, you can use compositing to draw a second image only where the first image exists: ctx.drawImage(image1,0,0); // this creates the 'mask' ctx.globalCompositeOperation='source-in'; ctx.drawImage(image2,0,0); // this image only draws inside the mask Illustration: House image drawn first and second Grass image is drawn only where house

Assuming I have: var context = document.getElementById('test').getContext('2d'); // Background context.fillStyle = '#000'; context.fillRect(0,0,300,300); // 'P' context.beginPath(); context.moveTo(90,89); context.lineTo(161,89); context.quadraticCurveTo(200,89,200,127); context.quadraticCurveTo(200,166,148,166); context.lineTo(115,166); context.lineTo(108,210); context.lineTo(69,210); context.lineTo(90,89); context.fillStyle = "#eee"; context.fill(); context.closePath(); context.globalCompositeOperation = 'destination-out'; // 'P' hole context.beginPath(); context.moveTo(124,117); context

I need to specify a rectangle in which the Android canvas CANNOT draw inside of. I know that clipRect will specify and area in which to draw in, but I was if I could reverse this effect. In other words how do I draw an object making it draw to the outside of a rectangle. Image for clarification: I'm not sure if this is actually going to be more performant than doing an overdraw. But you could set a clipping path to the full view, then set a second one to the exclusion zone with Region.Op DIFFERENCE set. That would set the clipping rect to the difference between the two. With Android O, Canvas

is there any way to choose an area on the canvas by color and clip it? I want to be able to clip an undefined aread that the only thing in common between all the pixels is that they all have the same color. thanks Live Demo Below is a way to select a color.. and do whatever you want with it. I pass a color I want to find iterate over every pixel and remove the color that matches, since Im not sure what you meant by clipping I assumed you mean remove. However please note on large images this method will be slow. // Takes an array with 3 color components, rgb function removeColor(color){ var

Guess the title of the post may need editing, but for now I don't know where the problems are. I have read pages and answers to similar questions, here and elsewhere. One Stack Overflow answer is especially close, but I don't understand it. I want a function, to draw polygons on canvas at desired coordinates and to fill them with some background image loaded from a file (large enough that no tiling is needed). Triangles would be fine for a test. Apparently I should use drawImage and clip, and to give the polygon a border, I can resuse the same path for the clip and the stroke. Also apparently

The UIElement.Clip property takes a Geometry object and uses it to clip away the outside of the UIElement . I would like to do the geometric inverse and punch a hole into the element instead. Anyone know how to do this? I imagine creating an inverted version of the clip geometry would work, but I can't find a way to do this. EDIT It seems that WPF has Geometry.Combine which can be used to subtract one geometry from another, though this isn't available in Silverlight. If it were, I could subtract the clip geometry from the rectangle of the element's bounding rectangle, and use that to clip