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Mini Shell
Mini Shell
VCanvas_canvas = createClass(VCanvas_base, {
init: function (width, height, target, interact) {
VCanvas_canvas._super.init.call(this, width, height, target);
this.canvas = document.createElement('canvas');
if (target[0]) {
target = target[0];
}
$.data(target, '_jqs_vcanvas', this);
$(this.canvas).css({ display: 'inline-block', width: width, height: height, verticalAlign: 'top' });
this._insert(this.canvas, target);
this._calculatePixelDims(width, height, this.canvas);
this.canvas.width = this.pixelWidth;
this.canvas.height = this.pixelHeight;
this.interact = interact;
this.shapes = {};
this.shapeseq = [];
this.currentTargetShapeId = undefined;
$(this.canvas).css({width: this.pixelWidth, height: this.pixelHeight});
},
_getContext: function (lineColor, fillColor, lineWidth) {
var context = this.canvas.getContext('2d');
if (lineColor !== undefined) {
context.strokeStyle = lineColor;
}
context.lineWidth = lineWidth === undefined ? 1 : lineWidth;
if (fillColor !== undefined) {
context.fillStyle = fillColor;
}
return context;
},
reset: function () {
var context = this._getContext();
context.clearRect(0, 0, this.pixelWidth, this.pixelHeight);
this.shapes = {};
this.shapeseq = [];
this.currentTargetShapeId = undefined;
},
_drawShape: function (shapeid, path, lineColor, fillColor, lineWidth) {
var context = this._getContext(lineColor, fillColor, lineWidth),
i, plen;
context.beginPath();
context.moveTo(path[0][0] + 0.5, path[0][1] + 0.5);
for (i = 1, plen = path.length; i < plen; i++) {
context.lineTo(path[i][0] + 0.5, path[i][1] + 0.5); // the 0.5 offset gives us crisp pixel-width lines
}
if (lineColor !== undefined) {
context.stroke();
}
if (fillColor !== undefined) {
context.fill();
}
if (this.targetX !== undefined && this.targetY !== undefined &&
context.isPointInPath(this.targetX, this.targetY)) {
this.currentTargetShapeId = shapeid;
}
},
_drawCircle: function (shapeid, x, y, radius, lineColor, fillColor, lineWidth) {
var context = this._getContext(lineColor, fillColor, lineWidth);
context.beginPath();
context.arc(x, y, radius, 0, 2 * Math.PI, false);
if (this.targetX !== undefined && this.targetY !== undefined &&
context.isPointInPath(this.targetX, this.targetY)) {
this.currentTargetShapeId = shapeid;
}
if (lineColor !== undefined) {
context.stroke();
}
if (fillColor !== undefined) {
context.fill();
}
},
_drawPieSlice: function (shapeid, x, y, radius, startAngle, endAngle, lineColor, fillColor) {
var context = this._getContext(lineColor, fillColor);
context.beginPath();
context.moveTo(x, y);
context.arc(x, y, radius, startAngle, endAngle, false);
context.lineTo(x, y);
context.closePath();
if (lineColor !== undefined) {
context.stroke();
}
if (fillColor) {
context.fill();
}
if (this.targetX !== undefined && this.targetY !== undefined &&
context.isPointInPath(this.targetX, this.targetY)) {
this.currentTargetShapeId = shapeid;
}
},
_drawRect: function (shapeid, x, y, width, height, lineColor, fillColor) {
return this._drawShape(shapeid, [[x, y], [x + width, y], [x + width, y + height], [x, y + height], [x, y]], lineColor, fillColor);
},
appendShape: function (shape) {
this.shapes[shape.id] = shape;
this.shapeseq.push(shape.id);
this.lastShapeId = shape.id;
return shape.id;
},
replaceWithShape: function (shapeid, shape) {
var shapeseq = this.shapeseq,
i;
this.shapes[shape.id] = shape;
for (i = shapeseq.length; i--;) {
if (shapeseq[i] == shapeid) {
shapeseq[i] = shape.id;
}
}
delete this.shapes[shapeid];
},
replaceWithShapes: function (shapeids, shapes) {
var shapeseq = this.shapeseq,
shapemap = {},
sid, i, first;
for (i = shapeids.length; i--;) {
shapemap[shapeids[i]] = true;
}
for (i = shapeseq.length; i--;) {
sid = shapeseq[i];
if (shapemap[sid]) {
shapeseq.splice(i, 1);
delete this.shapes[sid];
first = i;
}
}
for (i = shapes.length; i--;) {
shapeseq.splice(first, 0, shapes[i].id);
this.shapes[shapes[i].id] = shapes[i];
}
},
insertAfterShape: function (shapeid, shape) {
var shapeseq = this.shapeseq,
i;
for (i = shapeseq.length; i--;) {
if (shapeseq[i] === shapeid) {
shapeseq.splice(i + 1, 0, shape.id);
this.shapes[shape.id] = shape;
return;
}
}
},
removeShapeId: function (shapeid) {
var shapeseq = this.shapeseq,
i;
for (i = shapeseq.length; i--;) {
if (shapeseq[i] === shapeid) {
shapeseq.splice(i, 1);
break;
}
}
delete this.shapes[shapeid];
},
getShapeAt: function (el, x, y) {
this.targetX = x;
this.targetY = y;
this.render();
return this.currentTargetShapeId;
},
render: function () {
var shapeseq = this.shapeseq,
shapes = this.shapes,
shapeCount = shapeseq.length,
context = this._getContext(),
shapeid, shape, i;
context.clearRect(0, 0, this.pixelWidth, this.pixelHeight);
for (i = 0; i < shapeCount; i++) {
shapeid = shapeseq[i];
shape = shapes[shapeid];
this['_draw' + shape.type].apply(this, shape.args);
}
if (!this.interact) {
// not interactive so no need to keep the shapes array
this.shapes = {};
this.shapeseq = [];
}
}
});
Zerion Mini Shell 1.0