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@ -199,25 +199,32 @@ protected:
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byte colours[GRAPH_MAX_DATASETS];
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OverflowSafeInt64 cost[GRAPH_MAX_DATASETS][GRAPH_NUM_MONTHS]; ///< Stored costs for the last #GRAPH_NUM_MONTHS months
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int64 GetHighestValue(int initial_highest_value) const
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/**
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* Get the highest value of the graph's data. Excluded data is taken into account too, to prevent the graph
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* from changing its size when enabling / disabling data.
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* @return Highest value of the graph.
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*/
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int64 GetHighestValue() const
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{
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OverflowSafeInt64 highest_value = initial_highest_value;
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OverflowSafeInt64 highest_value = 0;
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for (int i = 0; i < this->num_dataset; i++) {
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if (!HasBit(this->excluded_data, i)) {
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for (int j = 0; j < this->num_on_x_axis; j++) {
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OverflowSafeInt64 datapoint = this->cost[i][j];
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if (datapoint != INVALID_DATAPOINT) {
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/* For now, if the graph has negative values the scaling is
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* symmetrical about the x axis, so take the absolute value
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* of each data point. */
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highest_value = max(highest_value, abs(datapoint));
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}
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for (int j = 0; j < this->num_on_x_axis; j++) {
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OverflowSafeInt64 datapoint = this->cost[i][j];
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if (datapoint != INVALID_DATAPOINT) {
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/* For now, if the graph has negative values the scaling is
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* symmetrical about the x axis, so take the absolute value
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* of each data point. */
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highest_value = max(highest_value, abs(datapoint));
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}
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}
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}
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/* Prevent showing the highest value too close to the graph upper limit. */
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highest_value = (11 * highest_value) / 10;
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/* Avoid using zero as the highest value. */
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if (highest_value == 0) highest_value = GRAPH_NUM_LINES_Y - 1;
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/* Round up highest_value so that it will divide cleanly into the number of
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* axis labels used. */
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int round_val = highest_value % (GRAPH_NUM_LINES_Y - 1);
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@ -274,13 +281,7 @@ protected:
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r.left += 9;
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r.right -= 5;
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/* Start of with a highest_value of twice the height of the graph in pixels.
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* It's a bit arbitrary, but it makes the cargo payment graph look a little
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* nicer, and prevents division by zero when calculating where the datapoint
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* should be drawn. */
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highest_value = r.bottom - r.top + 1;
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if (!this->has_negative_values) highest_value *= 2;
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highest_value = GetHighestValue(highest_value);
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highest_value = GetHighestValue();
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/* Get width for Y labels */
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int label_width = GetYLabelWidth(highest_value);
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