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Thread: How to make sprite's translation persistent?

  1. #1
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    Default Answered: How to make sprite's translation persistent?

    When I drag sprites with this handler
    Code:
    'drag': function(e){
            object.setAttributes({
                translationX: e.deltaX,
                translationY: e.deltaY
            });
        }
    everything is ok, but I can't make that position changes persistent. So when I try to drag already dragged element, it starts with the same position, like it was never dragged.
    How to apply translation changes to sprites?

    Thanks in advance!

  2. Thank you for response,

    unfortunately setAttributes doesn't affect cx and cy of sprite what (I suppose) makes dragging incorrect.

    So I ended up with this solution: I store all translations for current sprite in special Object (called spriteTranslationSession in snippet). Then on each 'drag' event I sum deltas of dragging with stored translation and on each 'dragend' event I replace values of sprite's translation - that makes dragging seamless.

    Code:
    'drag': function(e){
       var surface = cmp.getSurface(),
             currentTranslation = this.spriteTranslationSession[this.active.getId()];
       this.active.setAttributes({
             translationX: e.deltaX + currentTranslation.x,
             translationY: e.deltaY + currentTranslation.y
       });
       surface.renderFrame();
    }
    Maybe that's redundant work but I couldn't find better solution.

    Thank you guys for great work!

  3. #2
    Sencha - Sr Software Engineer mitchellsimoens's Avatar
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    Default

    Have you tried this (from docs):

    Code:
    sprite.setAttributes({
      translate: {
       x: 10,
       y: 10
      }
    }, true);
    Mitchell Simoens @LikelyMitch
    Sencha Inc, Senior Software Engineer
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  4. #3
    Sencha User
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    Default

    Thank you for response,

    unfortunately setAttributes doesn't affect cx and cy of sprite what (I suppose) makes dragging incorrect.

    So I ended up with this solution: I store all translations for current sprite in special Object (called spriteTranslationSession in snippet). Then on each 'drag' event I sum deltas of dragging with stored translation and on each 'dragend' event I replace values of sprite's translation - that makes dragging seamless.

    Code:
    'drag': function(e){
       var surface = cmp.getSurface(),
             currentTranslation = this.spriteTranslationSession[this.active.getId()];
       this.active.setAttributes({
             translationX: e.deltaX + currentTranslation.x,
             translationY: e.deltaY + currentTranslation.y
       });
       surface.renderFrame();
    }
    Maybe that's redundant work but I couldn't find better solution.

    Thank you guys for great work!

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