How can I delete a pathway in paper.js?

Question

How can I delete a pathway in paper.js?

Is it possible to create a new path using the canvas globalCompositeOperation set to 'destination-out'? If so, how would I go about doing this?

I have observed that Item has a blendMode property which can be found at . However, experimenting with different values of the blendMode property did not yield the desired outcome.

javascript canvas html5-canvas paperjs

Answer 1

Answer №1

http://example.com/code123/

After taking into account your recent input, it appears that creating layers is essential, as explained in detail here:

http://example.com/tutorial123/

Once you have set up the layers, you can then proceed to add your paths to a specific layer and execute the following code snippet:

 // Insert image as a background in the project
 // ... insert your code here ...

 var newLayer = new Layer();

Each time you create a new Layer, it automatically becomes the active layer of the project, allowing you to freely draw on the new layer.

If you are interested in incorporating a basic 'undo' feature, you can implement the following:

 function onMouseDown(event) {
     if (window.mode == "draw") {
        myPath = new Path();
        myPath.strokeColor = 'black';
     }
     else if (window.mode == "undo") {
        myPath.opacity = '0'; // This action makes the previously used path completely transparent
        // Alternatively, myPath.remove(); // This option deletes the path.
        // If you require a functionality that enables drawing and erasing, you could explore other alternatives.
     }
 }

However, if your goal is to achieve something like this:

 function onMouseDrag(event) {
   if (window.mode == "draw") {
     myPath.add(event.point);
   }
   else if (window.mode == "erase") {
     myPath.removeSegment(0);
   }
 }

This function specifically erases segments of the path from the start to the end. To fully utilize this, you will need a method to identify a path upon clicking (possibly using layer.getChildren() to select a child). Subsequently, by utilizing the mouse movement point, you must determine the segment index to remove it from the path using .removeSegment(index).

http://example.com/reference/erase-segment/

Answer 2

http://example.com/code123/

After taking into account your recent input, it appears that creating layers is essential, as explained in detail here:

http://example.com/tutorial123/

Once you have set up the layers, you can then proceed to add your paths to a specific layer and execute the following code snippet:

 // Insert image as a background in the project
 // ... insert your code here ...

 var newLayer = new Layer();

Each time you create a new Layer, it automatically becomes the active layer of the project, allowing you to freely draw on the new layer.

If you are interested in incorporating a basic 'undo' feature, you can implement the following:

 function onMouseDown(event) {
     if (window.mode == "draw") {
        myPath = new Path();
        myPath.strokeColor = 'black';
     }
     else if (window.mode == "undo") {
        myPath.opacity = '0'; // This action makes the previously used path completely transparent
        // Alternatively, myPath.remove(); // This option deletes the path.
        // If you require a functionality that enables drawing and erasing, you could explore other alternatives.
     }
 }

However, if your goal is to achieve something like this:

 function onMouseDrag(event) {
   if (window.mode == "draw") {
     myPath.add(event.point);
   }
   else if (window.mode == "erase") {
     myPath.removeSegment(0);
   }
 }

This function specifically erases segments of the path from the start to the end. To fully utilize this, you will need a method to identify a path upon clicking (possibly using layer.getChildren() to select a child). Subsequently, by utilizing the mouse movement point, you must determine the segment index to remove it from the path using .removeSegment(index).

http://example.com/reference/erase-segment/

Answer 3

Answer №2

One easy fix is to simply create a white path instead. Check out this example: http://jsfiddle.net/D8vMG/11/

function onMouseDown(event) {
    if (window.mode == "drawing") {
       myPath = new Path();
       myPath.strokeColor = 'black';
     }
     else if (window.mode == "erasing") {
        myPath = new Path();
        myPath.strokeColor = 'white';
        myPath.strokeWidth =  10;
     }
}

Answer 4

One easy fix is to simply create a white path instead. Check out this example: http://jsfiddle.net/D8vMG/11/

function onMouseDown(event) {
    if (window.mode == "drawing") {
       myPath = new Path();
       myPath.strokeColor = 'black';
     }
     else if (window.mode == "erasing") {
        myPath = new Path();
        myPath.strokeColor = 'white';
        myPath.strokeWidth =  10;
     }
}

How can I delete a pathway in paper.js?

Answer №1

Answer №2

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