114 lines
3.0 KiB
JavaScript
114 lines
3.0 KiB
JavaScript
/**
|
|
* Holds the entire state of the diagram as a 2D array of cells
|
|
* and provides methods to modify the current state.
|
|
*
|
|
* @constructor
|
|
*/
|
|
ascii.State = function() {
|
|
/** @type {Array.<Array.<ascii.Cell>>} */
|
|
this.cells = new Array(MAX_GRID_SIZE);
|
|
/** @type {Array.<ascii.Cell>} */
|
|
this.scratchCells = new Array();
|
|
|
|
for (var i = 0; i < this.cells.length; i++) {
|
|
this.cells[i] = new Array(MAX_GRID_SIZE);
|
|
for (var j = 0; j < this.cells[i].length; j++) {
|
|
this.cells[i][j] = new ascii.Cell();
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Returns the cell at the given coordinates.
|
|
*
|
|
* @param {ascii.Vector} vector
|
|
* @return {ascii.Cell}
|
|
*/
|
|
ascii.State.prototype.getCell = function(vector) {
|
|
return this.cells[vector.x][vector.y];
|
|
};
|
|
|
|
/**
|
|
* Sets the cells value at the given position. Probably shouldn't
|
|
* be used directly in many cases. Used drawValue instead.
|
|
*
|
|
* @param {ascii.Vector} position
|
|
* @param {?string} value
|
|
*/
|
|
ascii.State.prototype.setValue = function(position, value) {
|
|
this.getCell(position).value = value;
|
|
};
|
|
|
|
/**
|
|
* Sets the cells scratch (uncommitted) value at the given position.
|
|
*
|
|
* @param {ascii.Vector} position
|
|
* @param {?string} value
|
|
*/
|
|
ascii.State.prototype.drawValue = function(position, value) {
|
|
var cell = this.getCell(position);
|
|
this.scratchCells.push(cell);
|
|
cell.scratchValue = value;
|
|
};
|
|
|
|
/**
|
|
* Clears the current drawing scratchpad.
|
|
*/
|
|
ascii.State.prototype.clearDraw = function() {
|
|
for (var i in this.scratchCells) {
|
|
this.scratchCells[i].scratchValue = null;
|
|
}
|
|
this.scratchCells.length = 0;
|
|
};
|
|
|
|
/**
|
|
* Returns the draw value of a cell at the given position.
|
|
*
|
|
* @param {ascii.Vector} position
|
|
* @return {?string}
|
|
*/
|
|
ascii.State.prototype.getDrawValue = function(position) {
|
|
var cell = this.getCell(position);
|
|
var value = cell.scratchValue != null ? cell.scratchValue : cell.value;
|
|
if (value != SPECIAL_VALUE) {
|
|
return value;
|
|
}
|
|
|
|
// Magic time.
|
|
var context = this.getContext(position);
|
|
|
|
if (context.left && context.right && !context.up && !context.down) {
|
|
return SPECIAL_LINE_H;
|
|
}
|
|
if (!context.left && !context.right && context.up && context.down) {
|
|
return SPECIAL_LINE_V;
|
|
}
|
|
if (context.left && context.right && context.up && context.down) {
|
|
return SPECIAL_LINE_H;
|
|
}
|
|
return SPECIAL_VALUE;
|
|
};
|
|
|
|
/**
|
|
* @param {ascii.Vector} position
|
|
* @return {ascii.CellContext}
|
|
*/
|
|
ascii.State.prototype.getContext = function(position) {
|
|
var left = this.getCell(position.add(new ascii.Vector(-1, 0))).isSpecial();
|
|
var right = this.getCell(position.add(new ascii.Vector(1, 0))).isSpecial();
|
|
var up = this.getCell(position.add(new ascii.Vector(0, -1))).isSpecial();
|
|
var down = this.getCell(position.add(new ascii.Vector(0, 1))).isSpecial();
|
|
return new ascii.CellContext(left, right, up, down);
|
|
};
|
|
|
|
/**
|
|
* Ends the current draw, commiting anything currently drawn the scratchpad.
|
|
*/
|
|
ascii.State.prototype.commitDraw = function() {
|
|
for (var i in this.scratchCells) {
|
|
this.scratchCells[i].value = this.scratchCells[i].getRawValue();
|
|
this.scratchCells[i].scratchValue = null;
|
|
}
|
|
};
|
|
|