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Linear Calendar

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Slides prepared by Ben Pitts. November 2013. Linear Calendar. Ben Pitts Semester Project Android App Development Computer Science Dept , ODU. Linear Calendar Overview. Far Weekly Hourly. Making an interactive timeline Clock or calendar

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Linear Calendar

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  1. Slides prepared by Ben Pitts November2013 Linear Calendar Ben Pitts Semester Project Android App Development Computer Science Dept, ODU

  2. Linear Calendar Overview Far Weekly Hourly Making an interactive timeline • Clock or calendar • Zoom-sensitive context • Far: Events collapse into series • Weekly: Events fall vertically beneath days • Hourly: Events shown on their marks • Events saved to cloud • Phone’s Calendar • Google Calendar • Can be extended • Show photos on timeline • Facebook photos, events • Emails, SMS, IMs • Loose annotations, virtual whiteboard • Live wallpaper • Lockscreen

  3. Linear Calendar Overview Years, months shown Key dates • Birthdays • Anniversaries • Anchor dates • Major events only • Series collapsed Far view Weekly view Hourly view • Weeks, days shown • All events shown • Events vertical beneath days • Hours shown • Minutes, seconds shown dependent on scale • Events horizontal beneath the ruler at their start/end times

  4. Progress / Challenges • Challenges • SurfaceViewvs Canvas • Canvas is good enough for a prototype • Tracking multiple fingers reliably • Must store pointer IDs • Handle 1st finger up with 2nd down, avoid jumping • Disregard inputs too close to each other • Don’t let your time turn inside out • Multitouch scale algorithm • Converting pixels to milliseconds • Scaling the ruler’s left and right based on touch movement in pixels • ‘Correct’ multitouch – Content is anchored to your fingertips and moves intuitively in response to input.

  5. Progress / Challenges • Progress: • View class • Ruler display: minutes/seconds • Position determined by date (in milliseconds since epoch) • Single-touch scrolling • Ruler slides to match finger movement • Two-touch scrolling/scaling • Ruler slides and scales to match position of fingers • Todo: • Ruler scale: hours/minutes, days/hours, further.. • Scale states: far, daily, hourly • Variable content detail • Smooth transition between scale states • Event display beneath ruler • Touch events to create/view/edit/remove events • Detailed event data display levels (all data when zoomed in close, just title or shape when far away)

  6. Timeline View – Custom Control • Ruler drawn between ‘left’ and ‘right’ millisecond calendar values • Single touch panning • left,right += Δx*span/width • Two finger panning / scaling • ‘Time’ of finger 1,2 before move = • Y1,old= ms(x1,old) y2,old= ms(x2,old) • ms(x) = x*span/width + left • Slope of new ruler scale = • m = Δyold/ Δxnew • = y2,old-y1,old / x2,new–x1,new • left = y1,old – m*x1,new • right = m(w – x1,new) + y1,old • Fling – GestureDetector.onScroll?

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