/* the colours and cost array of GraphDrawer must accomodate

		 * both values for cargo and companies. So if any are higher, quit */

		assert_compile(GRAPH_MAX_DATASETS >= (int)NUM_CARGO && GRAPH_MAX_DATASETS >= (int)MAX_COMPANIES);

		assert(this->num_vert_lines > 0);

		byte grid_colour = _colour_gradient[COLOUR_GREY][4];

		/* Rect r will be adjusted to contain just the graph, with labels being

		 * placed outside the area. */

		r.top    += 5 + GetCharacterHeight(FS_SMALL) / 2;

		r.bottom -= (this->month == 0xFF ? 1 : 3) * GetCharacterHeight(FS_SMALL) + 4;

		r.right  -= 5;

		/* Start of with a highest_value of twice the height of the graph in pixels.

		 * It's a bit arbitrary, but it makes the cargo payment graph look a little

		 * nicer, and prevents division by zero when calculating where the datapoint

		 * should be drawn. */

		highest_value = r.bottom - r.top + 1;

		if (!this->has_negative_values) highest_value *= 2;

		highest_value = GetHighestValue(highest_value);

		/* Get width for Y labels */

		int label_width = GetYLabelWidth(highest_value);

		/* Don't draw the first line, as that's where the axis will be. */

		x = r.left + x_sep;

		for (int i = 0; i < this->num_vert_lines; i++) {

			GfxFillRect(x, r.top, x, r.bottom, grid_colour);

			x += x_sep;

		}

		/* Draw the horizontal grid lines. */

		y = r.bottom;

		for (int i = 0; i < GRAPH_NUM_LINES_Y; i++) {

			GfxFillRect(r.left, y, r.right, y, grid_colour);

			y -= y_sep;

		}

		/* Draw the y axis. */

		GfxFillRect(r.left, r.top, r.left, r.bottom, GRAPH_AXIS_LINE_COLOUR);

		/* Draw the x axis. */

		y = x_axis_offset + r.top;

		GfxFillRect(r.left, y, r.right, y, GRAPH_AXIS_LINE_COLOUR);

		/* Find the largest value that will be drawn. */

		int64 y_label = highest_value;

		int64 y_label_separation = highest_value / (GRAPH_NUM_LINES_Y - 1);

		/* If there are negative values, the graph goes from highest_value to

		 * -highest_value, not highest_value to 0. */

		if (this->has_negative_values) y_label_separation *= 2;

		y = r.top - GetCharacterHeight(FS_SMALL) / 2;

		for (int i = 0; i < GRAPH_NUM_LINES_Y; i++) {

			SetDParam(0, this->format_str_y_axis);

			SetDParam(1, y_label);

			y_label -= y_label_separation;

			y += y_sep;

		}

		/* draw strings on the x axis */

		if (this->month != 0xFF) {

			x = r.left;

			y = r.bottom + 2;

			byte month = this->month;

			Year year  = this->year;

			for (int i = 0; i < this->num_on_x_axis; i++) {

STR_MONTH_AUG                                                   :August

STR_MONTH_SEP                                                   :September

STR_MONTH_OCT                                                   :October

STR_MONTH_NOV                                                   :November

STR_MONTH_DEC                                                   :December

############ range for months ends

# Graph window

STR_GRAPH_KEY_BUTTON                                            :{BLACK}Key

STR_GRAPH_KEY_TOOLTIP                                           :{BLACK}Show key to graphs

STR_GRAPH_X_LABEL_MONTH                                         :{TINYFONT}{STRING}{} {STRING}

STR_GRAPH_X_LABEL_MONTH_YEAR                                    :{TINYFONT}{STRING}{} {STRING}{}{NUM}

STR_GRAPH_Y_LABEL_NUMBER                                        :{TINYFONT}{COMMA}

STR_GRAPH_OPERATING_PROFIT_CAPTION                              :{WHITE}Operating Profit Graph

STR_GRAPH_INCOME_CAPTION                                        :{WHITE}Income Graph

STR_GRAPH_CARGO_DELIVERED_CAPTION                               :{WHITE}Units of cargo delivered

STR_GRAPH_COMPANY_PERFORMANCE_RATINGS_CAPTION                   :{WHITE}Company performance ratings (maximum rating=1000)

STR_GRAPH_COMPANY_VALUES_CAPTION                                :{WHITE}Company values

STR_GRAPH_CARGO_PAYMENT_RATES_CAPTION                           :{WHITE}Cargo Payment Rates

STR_GRAPH_CARGO_PAYMENT_RATES_X_LABEL                           :{TINYFONT}{BLACK}Days in transit

STR_GRAPH_CARGO_PAYMENT_RATES_TITLE                             :{TINYFONT}{BLACK}Payment for delivering 10 units (or 10,000 litres) of cargo a distance of 20 squares

STR_GRAPH_CARGO_PAYMENT_TOGGLE_CARGO                            :{BLACK}Toggle graph for cargo type on/off