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Sketchpad now delivering drawing to other sketchpads. "Clear" feature…
… not working across sketchpads currently.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,122 +1,126 @@ | ||
| var PIC = window.PIC || {}; | ||
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| PIC.createPad = function (padSelector) { | ||
| PIC.createPad = function (selector) { | ||
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| var $canvas = $(padSelector), | ||
| $doc = $(document), | ||
| context = $canvas[0].getContext('2d'), | ||
| penX = 0, | ||
| penY = 0, | ||
| isPenDown = false, | ||
| path = {}, | ||
| onChangeCallbacks = []; | ||
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| $canvas.clear = function() { | ||
| context.clearRect(0,0,10000,10000); | ||
| }; | ||
| var pen, pad, callbacks; | ||
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| // The path inst is the array that stores the pad's drawing history | ||
| path.inst = []; | ||
| callbacks = []; | ||
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| // Add instruction to the pad. Accepted values: 'up', 'down', 'move, x, y' | ||
| path.add = function (word, x, y) { | ||
| var ins = {} | ||
| ins.ins = word; | ||
| if (x && y) { | ||
| ins.x = x; | ||
| ins.y = y; | ||
| } | ||
| this.inst.push(ins); | ||
| this.render(); | ||
| pen = (function () { | ||
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| for (var i=0; i<onChangeCallbacks.length; i++) { | ||
| onChangeCallbacks[i](arguments) | ||
| } | ||
| }; | ||
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| // Clear the canvas and redraw the pad's entire sketch history | ||
| path.render = function () { | ||
| var i, len, ins; | ||
| var $canvas, $doc, context, history, padX, padY, isDown, step; | ||
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| $canvas = $(selector).first(); | ||
| $doc = $(document); | ||
| history = []; | ||
| padX = $canvas.offset().left; | ||
| padY = $canvas.offset().top; | ||
| isDown = false; | ||
| context = $canvas[0].getContext('2d'); | ||
| step = function (actionName) { | ||
| return function (x, y) { | ||
| var newStep = {}, i; | ||
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| newStep.action = actionName; | ||
| if (x && y) { | ||
| newStep.x = x; | ||
| newStep.y = y; | ||
| } | ||
| history.push(newStep); | ||
| pen.draw(); | ||
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| for (i = 0; i < callbacks.length; i++) { | ||
| callbacks[i](newStep); | ||
| } | ||
| }; | ||
| }; | ||
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| // Setup | ||
| context.lineWidth = 4; | ||
| context.lineCap = 'round'; | ||
| context.lineJoin = 'round'; | ||
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| // Events | ||
| $canvas.mousedown(function (e) { | ||
| pen.down(); | ||
| pen.move(e.pageX - padX, e.pageY - padY - 0.001); | ||
| pen.move(e.pageX - padX, e.pageY - padY); | ||
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| $canvas.clear(); | ||
| $doc.bind('mousemove', function (e) { | ||
| pen.move(e.pageX - padX, e.pageY - padY); | ||
| }); | ||
| }); | ||
| $doc.mouseup(function (e) { | ||
| pen.up(); | ||
| $doc.unbind('mousemove'); | ||
| }); | ||
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| for (i=0, len=this.inst.length; i < len; i++) { | ||
| ins = this.inst[i] | ||
| switch( ins.ins ) { | ||
| case 'down': | ||
| context.beginPath(); | ||
| isPenDown = true; | ||
| break; | ||
| case 'move': | ||
| if (isPenDown) { | ||
| context.lineTo(ins.x, ins.y); | ||
| } else { | ||
| context.moveTo(ins.x, ins.y); | ||
| return { | ||
| up: step('up'), | ||
| down: step('down'), | ||
| move: step('move'), | ||
| clear: function () { | ||
| context.clearRect(0, 0, 10000, 10000); | ||
| }, | ||
| draw: function () { | ||
| var i, step, x, y; | ||
| isDown = false; | ||
| pen.clear(); | ||
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| for (i = 0; i < history.length; i++) { | ||
| step = history[i]; | ||
| switch (step.action) { | ||
| case 'down': | ||
| context.beginPath(); | ||
| isDown = true; | ||
| break; | ||
| case 'move': | ||
| context[isDown ? 'lineTo' : 'moveTo'](step.x, step.y); | ||
| break; | ||
| case 'up': | ||
| context.stroke(); | ||
| isDown = false; | ||
| break; | ||
| } | ||
| break; | ||
| case 'up': | ||
| } | ||
| if (isDown) { | ||
| context.stroke(); | ||
| isPenDown = false; | ||
| break; | ||
| } | ||
| }, | ||
| history: function (newHistory) { | ||
| if (newHistory) { | ||
| history = newHistory | ||
| } | ||
| return history; | ||
| } | ||
| } | ||
| if (isPenDown) { | ||
| context.stroke(); | ||
| } | ||
| }; | ||
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| path.clear = function () { | ||
| this.inst = []; | ||
| }; | ||
| }; | ||
| }()); | ||
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| // Setup the line styling | ||
| context.lineWidth = 4; | ||
| context.lineCap = 'round'; | ||
| context.lineJoin = 'round'; | ||
|
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| // Mouse events | ||
| $canvas.mousedown(function (e) { | ||
| var coords = $canvas.offset(); | ||
| path.add('move', e.pageX - coords.left, e.pageY - coords.top); | ||
| path.add('down'); | ||
| $doc.bind('mousemove', function (e) { | ||
| coords = $canvas.offset(); | ||
| path.add('move', e.pageX - coords.left, e.pageY - coords.top); | ||
| }) | ||
| }) | ||
| $doc.mouseup(function (e) { | ||
| path.add('up'); | ||
| $doc.unbind('mousemove'); | ||
| }) | ||
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| // Return the sketchpad's API | ||
| return { | ||
| penDown: function (x, y) { | ||
| path.add('down', x, y); | ||
| path.render(); | ||
| }, | ||
| penUp: function (x, y) { | ||
| path.add('up'); | ||
| path.render(); | ||
| }, | ||
| moveTo: function (x, y) { | ||
| path.add('move', x, y); | ||
| path.render(); | ||
| }, | ||
| reset: function () { | ||
| $canvas.clear(); | ||
| path.clear(); | ||
| }, | ||
| getPath: function () { | ||
| return path.inst; | ||
| }, | ||
| onChange: function (callback) { | ||
| // need to work out how to, on change, to send that info to other | ||
| // users's pads. | ||
| onChangeCallbacks.push(callback); | ||
| } | ||
| } | ||
| } | ||
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| pad = (function () { | ||
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| return { | ||
| history: function () { | ||
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| }, | ||
| step: function (step) { | ||
| pen.history(pen.history().concat([step])); | ||
| pen.draw(); | ||
| }, | ||
| clear: function () { | ||
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| }, | ||
| onStep: function (callback) { | ||
| callbacks.push(callback); | ||
| }, | ||
| reset: function () { | ||
| pen.clear(); | ||
| pen.history([]); | ||
| } | ||
| }; | ||
| }()); | ||
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| return pad; | ||
| }; |
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