0000885: Allow non-linear movements for Composite effect

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Date Submitted

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0000885

Kdenlive

Effects

public

2009-06-02 11:11

2009-07-23 21:04

Reporter

Granjow

Assigned To

Priority

normal

Severity

feature

Reproducibility

always

Status

new

Resolution

open

Platform

OS Version

Product Version

Recent git

Target Version

Fixed in Version

Summary

0000885: Allow non-linear movements for Composite effect

Description

At the moment moving/scrolling a clip is linear, the speed changes from 0 directly to e.g. 4 Pixel per second and stays there.

Non-linear movements would be nice here. Cosine and sine look kind of natural.

Additional Information

Example Java code I've used for one of my projects.
HILL goes a little bit over the target position and floats back again. SINE2 is just the square sine, it stops a little faster.

    /**
     * Paints the currently visible part of the image.

     * If the animation has been started, the position will be calculated
     * by looking at the passed time, the total time an animation should take,
     * and the selected transition.
     * @see #setAnimationType
     */
    public void paintComponent(Graphics g) {
    g.clearRect(0, 0, (int)windowSize.getWidth(), (int)windowSize.getHeight());

    int x = animationSrc * (int)windowSize.getWidth();
    long timeDiff = System.currentTimeMillis() - animationStart;

    if (timeDiff < animationTime) {
        int d = (animationDest - animationSrc) * (int) windowSize.getWidth();
        float completedFrac = (float)(System.currentTimeMillis() - animationStart) / animationTime;
        double multiplier;

        switch (animationType) {
        case LINEAR:
        multiplier = completedFrac;
        break;
        case COSINE:
        multiplier = cos(PI/2 * completedFrac);
        break;
        case COSINE_FULL:
        multiplier = cos(PI * completedFrac)/2;
        break;
        case SINE:
        multiplier = sin(PI/2 * completedFrac);
        break;
        case SINE2:
        multiplier = sin(PI/2 * completedFrac) * sin(PI/2 * completedFrac);
        break;
        case SINE_:
        multiplier = Math.pow(sin(PI/2 * completedFrac), 1.5);
        case SQUARE:
        multiplier = sqrt(completedFrac);
        break;
        case HILL:
        multiplier = -2.5*completedFrac*completedFrac + 3.5*completedFrac;
        break;
        default:
        multiplier = completedFrac;
        break;
        }
        x += multiplier * d;
    }
    x = -x;
    g.drawImage(pic, x, 0, null);
    }

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Build/Install Method

(select)

Attached Files

Relationships

related to

0001026

new

Dynamic, keyframable clip speed

Notes
(0003709) Granjow (developer) 2009-07-23 20:45	Supplementing: Linear sliding looks terrible.

(0003710) j-b-m (administrator) 2009-07-23 21:02	If we want that feature, it should be implemented in MLT. I think Dan has been doing some work on the keyframe handling in MLT, not sure what is going on on that side. The best would probably be to improve the "geometry" parameter in MLT to be able to specify how the path between keyframes should be calculated...

Issue History
Date Modified	Username	Field	Change
2009-06-02 11:11	Granjow	New Issue
2009-06-02 11:11	Granjow	Build/Install Method	=> (select)
2009-06-02 11:16	Granjow	Additional Information Updated
2009-07-23 20:45	Granjow	Note Added: 0003709
2009-07-23 21:02	j-b-m	Note Added: 0003710
2009-07-23 21:04	j-b-m	Relationship added	related to 0001026