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@@ -1,9 +1,10 @@ |
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const canvas = document.getElementById ('canvas'); |
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const ctx = canvas.getContext ('2d'); |
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const bg = (function () |
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const bg = ( |
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function () |
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{ |
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const _ = document.createElement('canvas'); |
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const _ = document.createElement ('canvas'); |
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const img = new Image (); |
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_.width = 1920; |
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@@ -11,7 +12,8 @@ const bg = (function () |
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const ctx = _.getContext ('2d'); |
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img.onload = (function () |
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img.onload = ( |
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function () |
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{ |
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ctx.drawImage (img, 0, 0); |
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}); |
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@@ -21,9 +23,10 @@ const bg = (function () |
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return _; |
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}) (); |
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const nizikaList = Array (24).fill ().map (function (__, i) |
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const nizikaList = Array (24).fill ().map ( |
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function (__, i) |
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{ |
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const _ = document.createElement('canvas'); |
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const _ = document.createElement ('canvas'); |
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const img = new Image (); |
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_.width = 300; |
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@@ -31,7 +34,8 @@ const nizikaList = Array (24).fill ().map (function (__, i) |
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const ctx = _.getContext ('2d'); |
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img.onload = (function () |
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img.onload = ( |
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function () |
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{ |
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ctx.drawImage (img, 0, 0); |
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replaceColorWithTransparent (_); |
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@@ -42,9 +46,10 @@ const nizikaList = Array (24).fill ().map (function (__, i) |
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return _; |
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}); |
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const kitaList = Array (40).fill ().map (function (__, i) |
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const kitaList = Array (40).fill ().map ( |
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function (__, i) |
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{ |
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const _ = document.createElement('canvas'); |
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const _ = document.createElement ('canvas'); |
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const img = new Image (); |
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_.width = 428; |
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@@ -52,7 +57,8 @@ const kitaList = Array (40).fill ().map (function (__, i) |
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const ctx = _.getContext ('2d'); |
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img.onload = (function () |
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img.onload = ( |
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function () |
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{ |
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ctx.drawImage (img, 0, 0); |
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}); |
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@@ -62,11 +68,21 @@ const kitaList = Array (40).fill ().map (function (__, i) |
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return _; |
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}); |
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const upperKita = document.createElement ('canvas'); |
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const runawayGuitar = new Audio ('./assets/kita.wav'); |
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let canvasX; |
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let canvasY; |
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let frame = 0; |
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let nizikaData = []; |
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let kitaData = []; |
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const nizikaVel = 5; |
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let runawayFlag = false; |
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let runawayFrame = 0; |
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preprocess (); |
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@@ -76,6 +92,23 @@ window.setInterval (() => reDraw (), 16); |
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function |
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preprocess () |
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{ |
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canvas.addEventListener ('click', |
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function f (e) |
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{ |
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this.removeEventListener ('click', f); |
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kitaData.push ({x: e.clientX, |
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y: e.clientY}); |
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runawayFlag = true; |
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runawayFrame = frame; |
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runawayGuitar.play (); |
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}); |
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upperKita.width = 428; |
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upperKita.height = 240; |
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reDraw (); |
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} |
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@@ -91,17 +124,45 @@ reDraw () |
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ctx.drawImage (bg, 0, 0, canvasX, canvasY); |
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nizikaData.push ({x: Math.random () * canvasX - 150, |
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y: Math.random () * canvasY - 150}); |
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if (!(runawayFlag)) |
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{ |
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nizikaData.push ({x: Math.random () * canvasX, |
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y: Math.random () * canvasY}); |
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} |
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if (nizikaData.length > 100) |
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nizikaData.shift (); |
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nizikaData.forEach (function (nizika) |
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kitaData.forEach ( |
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function (kita) |
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{ |
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ctx.drawImage (nizikaList[frame % 24], nizika.x, nizika.y); |
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ctx.drawImage (kitaList[frame % 40], kita.x - 214, kita.y - 120); |
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}); |
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nizikaData.forEach ( |
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function (nizika) |
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{ |
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ctx.drawImage (nizikaList[frame % 24], nizika.x - 150, nizika.y - 150); |
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if (runawayFlag) |
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{ |
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const l = Math.sqrt (Math.pow (kitaData[0].x - nizika.x, 2) |
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+ Math.pow (kitaData[0].y - nizika.y, 2)); |
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const t = Math.atan2 (kitaData[0].y - nizika.y, |
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kitaData[0].x - nizika.x); |
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nizika.x += nizikaVel * Math.cos (t); |
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nizika.y += nizikaVel * Math.sin (t); |
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} |
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}); |
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if (runawayFlag) |
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{ |
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changeAlpha (upperKita, kitaList[frame % 40], |
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Math.max (runawayFrame - frame + 85, 0) * 3); |
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ctx.drawImage (upperKita, kitaData[0].x - 214, kitaData[0].y - 120); |
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} |
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++frame; |
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} |
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@@ -126,3 +187,19 @@ replaceColorWithTransparent (canvas) |
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context.putImageData (imageData, 0, 0); |
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} |
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function |
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changeAlpha (toCanvas, canvas, alpha) |
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{ |
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const toCtx = toCanvas.getContext ('2d'); |
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const ctx = canvas.getContext ('2d'); |
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const imageData = ctx.getImageData (0, 0, canvas.width, canvas.height); |
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const pxs = imageData.data; |
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for (let i = 0; i < pxs.length; i += 4) |
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pxs[i + 3] = alpha; |
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toCtx.putImageData (imageData, 0, 0); |
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} |
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