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Merge pull request projectmesa#465 from RMKD/feature/tooltips
Added mouse interactionHandler to close projectmesa#457, fixed hexgrid drawLines
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,165 @@ | ||
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| /** | ||
| Mesa Visualization InteractionHandler | ||
| ==================================================================== | ||
| This uses the context of an additional canvas laid overtop of another canvas | ||
| visualization and maps mouse movements to agent position, displaying any agent | ||
| attributes included in the portrayal that are not listed in the ignoredFeatures. | ||
| The following portrayal will yield tooltips with wealth, id, and pos: | ||
| portrayal = { | ||
| "Shape": "circle", | ||
| "Filled": "true", | ||
| "Layer": 0, | ||
| "Color": colors[agent.wealth] if agent.wealth < len(colors) else '#a0a', | ||
| "r": 0.3 + 0.1 * agent.wealth, | ||
| "wealth": agent.wealth, | ||
| "id": agent.unique_id, | ||
| 'pos': agent.pos | ||
| } | ||
| **/ | ||
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| var InteractionHandler = function(width, height, gridWidth, gridHeight, ctx){ | ||
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| // Find cell size: | ||
| const cellWidth = Math.floor(width / gridWidth); | ||
| const cellHeight = Math.floor(height / gridHeight); | ||
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| const lineHeight = 10; | ||
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| // list of standard rendering features to ignore (and key-values in the portrayal will be added ) | ||
| const ignoredFeatures = [ | ||
| 'Shape', | ||
| 'Filled', | ||
| 'Color', | ||
| 'r', | ||
| 'x', | ||
| 'y', | ||
| 'w', | ||
| 'h', | ||
| 'width', | ||
| 'height', | ||
| 'heading_x', | ||
| 'heading_y', | ||
| 'stroke_color', | ||
| 'text_color' | ||
| ]; | ||
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| // Set a variable to hold the lookup table and make it accessible to draw scripts | ||
| var mouseoverLookupTable = this.mouseoverLookupTable = buildLookupTable(gridWidth, gridHeight); | ||
| function buildLookupTable(gridWidth, gridHeight){ | ||
| var lookupTable; | ||
| this.init = function(){ | ||
| lookupTable = [...Array(gridHeight).keys()].map(i => Array(gridWidth)); | ||
| } | ||
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| this.set = function(x, y, value){ | ||
| if(lookupTable[y][x]) | ||
| lookupTable[y][x].push(value); | ||
| else | ||
| lookupTable[y][x] = [value]; | ||
| } | ||
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| this.get = function(x, y){ | ||
| if(lookupTable[y]) | ||
| return lookupTable[y][x] || [] | ||
| return []; | ||
| } | ||
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| return this; | ||
| } | ||
|
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| var coordinateMapper; | ||
| this.setCoordinateMapper = function(mapperName){ | ||
| if(mapperName === "hex"){ | ||
| coordinateMapper = function(event){ | ||
| const x = Math.floor(event.offsetX/cellWidth); | ||
| const y = (x % 2 === 0) | ||
| ? Math.floor(event.offsetY/cellHeight) | ||
| : Math.floor((event.offsetY - cellHeight/2 )/cellHeight) | ||
| return {x: x, y: y}; | ||
| } | ||
| return; | ||
| } | ||
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| // default coordinate mapper for grids | ||
| coordinateMapper = function(event){ | ||
| return { | ||
| x: Math.floor(event.offsetX/cellWidth), | ||
| y: Math.floor(event.offsetY/cellHeight) | ||
| }; | ||
| }; | ||
| }; | ||
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| this.setCoordinateMapper('grid'); | ||
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| // wrap the rect styling in a function | ||
| function drawTooltipBox(ctx, x, y, width, height){ | ||
| ctx.fillStyle = "#F0F0F0"; | ||
| ctx.beginPath(); | ||
| ctx.shadowOffsetX = -3; | ||
| ctx.shadowOffsetY = 2; | ||
| ctx.shadowBlur = 6; | ||
| ctx.shadowColor = "#33333377"; | ||
| ctx.rect(x, y, width, height); | ||
| ctx.fill(); | ||
| ctx.shadowColor = "transparent"; | ||
| } | ||
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| var listener; var tmp | ||
| this.updateMouseListeners = function(portrayalLayer){tmp = portrayalLayer | ||
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| // Remove the prior event listener to avoid creating a new one every step | ||
| ctx.canvas.removeEventListener("mousemove", listener); | ||
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| // define the event litser for this step | ||
| listener = function(event){ | ||
| // clear the previous interaction | ||
| ctx.clearRect(0, 0, width, height); | ||
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| // map the event to x,y coordinates | ||
| const position = coordinateMapper(event); | ||
| const yPosition = Math.floor(event.offsetY/cellHeight); | ||
| const xPosition = Math.floor(event.offsetX/cellWidth); | ||
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| // look up the portrayal items the coordinates refer to and draw a tooltip | ||
| mouseoverLookupTable.get(position.x, position.y).forEach((portrayalIndex, nthAgent) => { | ||
| const agent = portrayalLayer[portrayalIndex]; | ||
| const features = Object.keys(agent).filter(k => ignoredFeatures.indexOf(k) < 0); | ||
| const textWidth = Math.max.apply(null, features.map(k => ctx.measureText(`${k}: ${agent[k]}`).width)); | ||
| const textHeight = features.length * lineHeight; | ||
| const y = Math.max(lineHeight * 2, Math.min(height - textHeight, event.offsetY - textHeight/2)); | ||
| const rectMargin = 2 * lineHeight; | ||
| var x = 0; | ||
| var rectX = 0; | ||
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| if(event.offsetX < width/2){ | ||
| x = event.offsetX + rectMargin + nthAgent * (textWidth + rectMargin); | ||
| ctx.textAlign = "left"; | ||
| rectX = x - rectMargin/2; | ||
| } else { | ||
| x = event.offsetX - rectMargin - nthAgent * (textWidth + rectMargin + lineHeight ); | ||
| ctx.textAlign = "right"; | ||
| rectX = x - textWidth - rectMargin/2; | ||
| } | ||
|
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| // draw a background box | ||
| drawTooltipBox(ctx, rectX, y - rectMargin, textWidth + rectMargin, textHeight + rectMargin); | ||
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| // set the color and draw the text | ||
| ctx.fillStyle = "black"; | ||
| features.forEach((k,i) => { | ||
| ctx.fillText(`${k}: ${agent[k]}`, x, y + i * lineHeight) | ||
| }) | ||
| }) | ||
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| }; | ||
| ctx.canvas.addEventListener("mousemove", listener); | ||
| }; | ||
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| return this; | ||
| } |