ドラッグ＆ドロップを支える技術

by 高津亘宏

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ࣗݾ঺հ ʲ໊લʳ ߴ௡࿱޺ ʲॴଐʳ ΦϯϥΠϯαϩϯ։ൃ෦ΞʔΩςΫτνʔϜ ʲྖҬʳ αʔόʔαΠυΤϯδχΞͱͯ͠ೖࣾ ۀ຿Ͱ͸Πϯϑϥ͔ΒϑϩϯτΤϯυ·Ͱ෯޿͘ ϑϩϯτΤϯυ͸7VFKT /VYUKT ͱ3FBDUKT /FYUKT ͕ॻ͚Δ ʲझຯʳ ϑοταϧ

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ͱ͜ΖͰօ͞Μʂ

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'JHNB΍.JSPͷΑ͏ͳ(6*Ͱυϥοά Ξϯυυϩοϓग़དྷΔΑ͏ͳ8FCΞϓϦ Λ࡞Γͨ͘ͳͬͨ͜ͱ͸͋Γ·ͤΜ͔ʁ

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๻͸͋Γ·͢ɻ

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8FC্ͰυϥοάˍυϩοϓΛ࣮૷͠Α͏ͱ ͨ͠ͱ͖ʹ·ͣ࠷ॳʹࢥ͍ͭ͘؆୯ͳ΍Γํ

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%0.ૢ࡞ ελΠϦϯάͨ͠IUNMΛ௚઀ૢ࡞͢Δख๏

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UPQQY MFGUQY υϥοάˍυϩοϓ͢ΔΦϒδΣΫτͷ࠲ඪΛঢ়ଶ؅ཧ   \Y Z^ EJWλάΛઈର഑ஔͰ഑ஔ͠ɺ࠲ඪΛঢ়ଶ؅ཧ ઈର഑ஔ

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UPQ:QY MFGU9QY $VSTPS $VSTPSͷ࠲ඪ͸Πϕϯτຖʹऔಘग़དྷΔ

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ʬυϥοά։࢝ʭ NPVTFEPXO 1$ PSUPVDITUBSU 41 \Y Z^ υϥοά։࢝ ԡ͢

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ʬυϥοάதʭ NPVTFNPWF 1$ PSUPVDINPWF 41 ʬυϩοϓʭ   NPVTFVQ 1$ PSUPVDIFOE 41 \Y Z^ υϥοάˍυϩοϓ ʬυϥοά։࢝ʭ NPVTFEPXO 1$ PSUPVDITUBSU 41 ཭͢

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EZ EY \Y Z^ \YEY ZEZ^ ΠϕϯτຖʹϚ΢εͷ࠲ඪ͔Βબ୒͍ͯ͠ΔΦϒδΣΫτͷ࠲ඪΛߋ৽ ʬυϥοά։࢝ʭ NPVTFEPXO 1$ PSUPVDITUBSU 41 ʬυϥοάதʭ NPVTFNPWF 1$ PSUPVDINPWF 41 ʬυϩοϓʭ   NPVTFVQ 1$ PSUPVDIFOE 41 Ϛ΢εͷҠಈڑ཭ EY EZ

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αϯϓϧ࣮૷

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%0.ૢ࡞ͰυϥοάˍυϩοϓΛ͢Δ୅දతͳϥΠϒϥϦ ʲWVFESBHHBCMFSFTJ[BCMFʳʲSFBDUESBHHBCMFʳ

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λεΫ؅ཧπʔϧͷΑ͏ͳ(6*Λ࣮૷Ͱ͖ΔϥΠϒϥϦ ɾWVFESBHHBCMF ɾSFBDUEOE ɾSFBDUCFBVUJGVMEOE SFBDUCFBVUJGVMEOEͷHJUIVCϦϙδτϦ IUUQTHJUIVCDPNBUMBTTJBOSFBDUCFBVUJGVMEOE ͔ΒҾ༻

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%PNૢ࡞ͷ՝୊

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େྔͷΦϒδΣΫτΛϦΞϧλΠϜڞ༗͢ΔΑ͏ͳෳࡶͳॲཧΛ΍Ζ͏ͱ͢Δͱॏ͍

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%0.ૢ࡞͸ߴίετˍݶք ΍ɹɹɹɹ͸$BOWBTΛ࢖༻͍ͯ͠Δ

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-BZFS DBOWBT -BZFS DBOWBT $BOWBTͱ͸ $BOWBT͸ɺ΢Σϒϖʔδ಺ʹϐΫηϧϕʔεͷάϥϑΟοΫεඳըΛՄೳʹ͢Δ)5.-ͷཁૉͷҰͭɻ   $BOWBT͸ɺ+BWB4DSJQUΛ༻͍ͯ௚઀ϐΫηϧΛૢ࡞͢Δ͜ͱͰɺߴ౓ͳඳըػೳ΍Ξχϝʔγϣϯɺը૾ฤूͳͲͷػೳΛ࣮ݱɻ   $BOWBTͷ-BZFSΛ෼͚Ε͹͓ޓ͍͸ׯবͤͣಠཱੑΛҡ࣋͢Δ͜ͱ͕ग़དྷΔɻ -BZFS DBOWBT

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%0.ૢ࡞WT$BOWBT ʬύϑΥʔϚϯεʭ   ɾ$BOWBT͸ϐΫηϧϕʔεͷඳըͰ͋ΓɺେྔͷΦϒδΣΫτ΍ಈ͖͕͋Δ৔߹Ͱ΋ΦϒδΣΫτͷҐஔ΍ঢ়ଶΛΞϓϦέʔγϣϯͷ +BWBTDSJQUͰ׬શʹ੍ޚͰ͖ΔͨΊ%0.ΑΓޮ཰తʹϨϯμϦϯάͰ͖Δ ɾ%0.͸ෳࡶͳπϦʔߏ଄Λ͍࣋ͬͯΔͳͲͷཧ༝͔Βɺ%0.ૢ࡞͸ߴίετͳͷͰଟ͘ͷΦϒδΣΫτΛυϥοάˍυϩοϓ͢Δ৔߹ ϨϯμϦϯάͷ஗Ԇ΍Ϋϥογϡ ϋϯά ͢ΔՄೳੑ͕͋Δ ʬελΠϦϯάͷॊೈੑɺಠཱੑʭ ɾ$BOWBT͸ϐΫηϧϨϕϧͰͷ੍ޚΛՄೳʹ͢ΔͨΊɺ೚ҙͷܗ΍৭ͷΦϒδΣΫτΛࣗ༝ʹඳըͰ͖ɺଞͷDTTͷӨڹΛड͚ͳ͍ ɾ%0.͸ඪ४ͷ)5.-͓Αͼ$44ελΠϦϯάʹ੍໿͞ΕɺଞͷDTTͷӨڹΛड͚ΔՄೳੑ͕͋Δ ʬΠϕϯτϋϯυϦϯάʭ ɾϒϥ΢β͸%0.ཁૉʹର͢ΔΠϕϯτϋϯυϦϯάΛωΠςΟϒʹαϙʔτ͍ͯ͠ΔͷͰ؆୯ʹ࣮૷ग़དྷΔ ɾDBOWBTʹ͸ΠϕϯτϋϯυϦϯάͷػೳ͕ແ͍ͨΊDBOWBT্ͷ֤ΦϒδΣΫτͷܗঢ়ʹ߹ΘͤͯΠϕϯτϋϯυϦϯάͷॲཧΛ ϑϧεΫϥονͰ࣮૷͠ͳ͍ͱ͍͚ͳ͍

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DBOWBT 3 B C બ୒͢ΔΦϒδΣΫτ ઌఔͱಉ༷ͳԁܗΦϒδΣΫτ

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DBOWBT 3 B C Y Z Ϛ΢ε ΠϕϯτϋϯυϦϯάͷϩδοΫυϥοά൑ఆ

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DBOWBT 3 B C Y Z Ϛ΢εͱԁͷத৺ͷڑ཭ ΠϕϯτϋϯυϦϯάͷϩδοΫυϥοά൑ఆ

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DBOWBT 3 B C Y Z Ϛ΢εͱԁͷத৺ͷڑ཭ Ϛ΢εͱԁͷத৺ͷڑ཭ (x − a)2 + (y − b)2 ≦ R ԁͷ൒ܘ (x − a)2 + (y − b)2 ≦ R2 ΠϕϯτϋϯυϦϯάͷϩδοΫυϥοά൑ఆ

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DBOWBT 3 B C Y Z υϥοά։࢝ (x − a)2 + (y − b)2 ≦ R2 NPVTFEPXOPSUPVDITUBSU

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DBOWBT B C Y Z υϥοάதNPVTFͷҠಈڑ཭Λࢉग़ Y Z EY EZ NPVTFNPWFPSUPVDINPWF

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DBOWBT B C Y Z NPVTFNPWF UPVDINPWF ΠϕϯτຖʹΦϒδΣΫτͷ࠲ඪΛߋ৽ˍDBOWBTΛ࠶ඳը 3 Y Z EY EZ BEY CEZ DBOWBTΛ࠶ඳը ˞ۃྗDBOWBTͷ-BZFSΛ෼͚Δ͜ͱͰࠩ෼Ҏ֎ എܠը૾౳ ͸࠶ඳը͠ͳ͍Α͏ʹ͢Δ͜ͱ͕ग़དྷΔ

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αϯϓϧ࣮૷ WVF

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αϯϓϧ࣮૷ WVF ΦϒδΣΫτͷܗঢ়ຖʹΠϕϯτϋϯυϦϯάͷϩδοΫΛॻ͔ͳ͍ͱ͍͚ͳ͍🥺

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αϯϓϧ࣮૷ WVF ΦϒδΣΫτͷܗঢ়ຖʹΠϕϯτϋϯυϦϯάͷϩδοΫΛॻ͔ͳ͍ͱ͍͚ͳ͍🥺 ,POWBKT͕ղܾʂ

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3FBDU΍7VFͰ΋࢖͑Δʂ LPOWBKT SFBDULPOWB WVFLPOWB

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,POWBKTͰ࢖͑Δ୅දతͳΦϒδΣΫτ $JSDMF 3FDU &MJQTF 4UBS 3FHVMBS1PMZHPO "SSPX

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αϯϓϧ࣮૷

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%SBHHBCMFΛ෇༩͢Δ͜ͱͰ؆୯ʹυϥοάˍυϩοϓΛ࣮૷Ͱ͖Δ

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%0.ૢ࡞WT$BOWBTͷ·ͱΊ ʬ%0.ૢ࡞Ͱ࡞Δͷ͕ద͍ͯ͠Δ࣌ʭ ɾ؆୯ͳ6*΍গྔͷಈతཁૉ͔͠ͳ͍৔߹ ɾ%0. )5.- ͷػೳΛ׆༻͍ͨ͠৔߹ FYλεΫ؅ཧπʔϧ౳ ʬ$BOWBTͰ࡞Δͷ͕ద͍ͯ͠Δͱ͖ʭ ɾߴ౓ͳάϥϑΟοΫεɺେྔͳಈతΦϒδΣΫτɺ·ͨ͸ߴස౓ͷ࠶ඳը͕ඞཁͳ৔߹ ɾDBOWBTͷػೳΛ׆༻ʢը૾΍ΞχϝʔγϣϯΛ࡞੒ͯ͠อଘʣ͍ͨ͠Α͏ͳ৔߹

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Ԡ༻ɿେྔͷΦϒδΣΫτΛυϥοάˍυϩοϓ͢Δ࣮૷ ɾΦϒδΣΫτͷϦετͰঢ়ଶ؅ཧ   ˠ/P42-Ͱѻ͑Δ   ɾDBOWBTͰ͸࠷ޙʹඳըͨ͠΋ͷ͕Ұ൪্ʹདྷΔ   ˠ࠷ޙʹબ୒ͨ͠ΦϒδΣΫτ͸Ϧετͷ຤ඌʹՃ͑ͯ[JOEFYΛ࣮૷