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(svn r19661) -Codechange: Base the number of vertical grids of a graph on its size.

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This commit is contained in:
terkhen 2010-04-17 19:15:13 +00:00
parent f8e1732e6d
commit 60e9047f3c
1 changed files with 32 additions and 25 deletions
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57
src/graph_gui.cpp
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@ -178,10 +178,8 @@ protected:
GRAPH_AXIS_LINE_COLOUR = 215,
GRAPH_NUM_MONTHS = 24, ///< Number of months displayed in the graph.
GRAPH_NUM_LINES_Y = 9, ///< How many horizontal lines to draw.
/* 9 is convenient as that means the distance between them is the gd_height of the graph / 8,
* which is the same
* as height >> 3. */
MIN_GRAPH_NUM_LINES_Y = 9, ///< Minimal number of horizontal lines to draw.
MIN_GRID_PIXEL_SIZE = 20, ///< Minimum distance between graph lines.
};
uint excluded_data; ///< bitmask of the datasets that shouldn't be displayed.
@ -208,9 +206,10 @@ protected:
/**
* Get the interval that contains the graph's data. Excluded data is ignored to show smaller values in
* better detail when disabling higher ones.
* @param num_hori_lines Number of horizontal lines to be drawn.
* @return Highest and lowest values of the graph (ignoring disabled data).
*/
ValuesInterval GetValuesInterval() const
ValuesInterval GetValuesInterval(int num_hori_lines) const
{
ValuesInterval current_interval;
current_interval.highest = INT64_MIN;
@ -238,32 +237,31 @@ protected:
int num_pos_grids;
int grid_size;
const int num_grids = GRAPH_NUM_LINES_Y - 1;
if (abs_lower == 0) {
if (abs_higher == 0) {
/* If both values are zero, show an empty graph. */
num_pos_grids = num_grids / 2;
num_pos_grids = num_hori_lines / 2;
grid_size = 1;
} else {
/* The positive part of the graph can use all grids. */
num_pos_grids = num_grids;
grid_size = ceil((float)abs_higher / num_grids);
num_pos_grids = num_hori_lines;
grid_size = ceil((float)abs_higher / num_hori_lines);
}
} else {
if (abs_higher == 0) {
/* The negative part of the graph can use all grids. */
num_pos_grids = 0;
grid_size = ceil((float)abs_lower / num_grids);
grid_size = ceil((float)abs_lower / num_hori_lines);
} else {
/* Get the smallest grid size required and the number of grids for each part of the graph. */
int min_pos_grids = 1;
int min_grid_size = INT_MAX;
for (num_pos_grids = 1; num_pos_grids <= num_grids - 1; num_pos_grids++) {
for (num_pos_grids = 1; num_pos_grids <= num_hori_lines - 1; num_pos_grids++) {
/* Size required for each part of the graph given this number of grids. */
int pos_grid_size = ceil((float)abs_higher / num_pos_grids);
int neg_grid_size = ceil((float)abs_lower / (num_grids - num_pos_grids));
int neg_grid_size = ceil((float)abs_lower / (num_hori_lines - num_pos_grids));
grid_size = max(pos_grid_size, neg_grid_size);
if (grid_size < min_grid_size) {
min_pos_grids = num_pos_grids;
@ -276,20 +274,23 @@ protected:
}
current_interval.highest = num_pos_grids * grid_size;
current_interval.lowest = -(num_grids - num_pos_grids) * grid_size;
current_interval.lowest = -(num_hori_lines - num_pos_grids) * grid_size;
return current_interval;
}
/** Get width for Y labels */
uint GetYLabelWidth(ValuesInterval current_interval) const
/** Get width for Y labels.
* @param current_interval Interval that contains all of the graph data.
* @param num_hori_lines Number of horizontal lines to be drawn.
*/
uint GetYLabelWidth(ValuesInterval current_interval, int num_hori_lines) const
{
/* draw text strings on the y axis */
int64 y_label = current_interval.highest;
int64 y_label_separation = (current_interval.highest - current_interval.lowest) / (GRAPH_NUM_LINES_Y - 1);
int64 y_label_separation = (current_interval.highest - current_interval.lowest) / num_hori_lines;
uint max_width = 0;
for (int i = 0; i < GRAPH_NUM_LINES_Y; i++) {
for (int i = 0; i < (num_hori_lines + 1); i++) {
SetDParam(0, this->format_str_y_axis);
SetDParam(1, y_label);
Dimension d = GetStringBoundingBox(STR_GRAPH_Y_LABEL);
@ -325,19 +326,25 @@ protected:
r.left += 9;
r.right -= 5;
interval = GetValuesInterval();
/* Initial number of horizontal lines. */
int num_hori_lines = 160 / MIN_GRID_PIXEL_SIZE;
/* For the rest of the height, the number of horizontal lines will increase more slowly. */
int resize = (r.bottom - r.top - 160) / (2 * MIN_GRID_PIXEL_SIZE);
if (resize > 0) num_hori_lines += resize;
int label_width = GetYLabelWidth(interval);
interval = GetValuesInterval(num_hori_lines);
int label_width = GetYLabelWidth(interval, num_hori_lines);
r.left += label_width;
int x_sep = (r.right - r.left) / this->num_vert_lines;
int y_sep = (r.bottom - r.top) / (GRAPH_NUM_LINES_Y - 1);
int y_sep = (r.bottom - r.top) / num_hori_lines;
/* Redetermine right and bottom edge of graph to fit with the integer
* separation values. */
r.right = r.left + x_sep * this->num_vert_lines;
r.bottom = r.top + y_sep * (GRAPH_NUM_LINES_Y - 1);
r.bottom = r.top + y_sep * num_hori_lines;
OverflowSafeInt64 interval_size = interval.highest + abs(interval.lowest);
/* Where to draw the X axis */
@ -356,7 +363,7 @@ protected:
/* Draw the horizontal grid lines. */
y = r.bottom;
for (int i = 0; i < GRAPH_NUM_LINES_Y; i++) {
for (int i = 0; i < (num_hori_lines + 1); i++) {
GfxFillRect(r.left - 3, y, r.left - 1, y, GRAPH_AXIS_LINE_COLOUR);
GfxFillRect(r.left, y, r.right, y, grid_colour);
y -= y_sep;
@ -378,11 +385,11 @@ protected:
/* draw text strings on the y axis */
int64 y_label = interval.highest;
int64 y_label_separation = abs(interval.highest - interval.lowest) / (GRAPH_NUM_LINES_Y - 1);
int64 y_label_separation = abs(interval.highest - interval.lowest) / num_hori_lines;
y = r.top - GetCharacterHeight(FS_SMALL) / 2;
for (int i = 0; i < GRAPH_NUM_LINES_Y; i++) {
for (int i = 0; i < (num_hori_lines + 1); i++) {
SetDParam(0, this->format_str_y_axis);
SetDParam(1, y_label);
DrawString(r.left - label_width - 4, r.left - 4, y, STR_GRAPH_Y_LABEL, graph_axis_label_colour, SA_RIGHT);
@ -536,7 +543,7 @@ public:
uint y_label_width = GetStringBoundingBox(STR_GRAPH_Y_LABEL).width;
size->width = max<uint>(size->width, 5 + y_label_width + this->num_on_x_axis * (x_label_width + 5) + 9);
size->height = max<uint>(size->height, 5 + (1 + GRAPH_NUM_LINES_Y * 2 + (this->month != 0xFF ? 3 : 1)) * FONT_HEIGHT_SMALL + 4);
size->height = max<uint>(size->height, 5 + (1 + MIN_GRAPH_NUM_LINES_Y * 2 + (this->month != 0xFF ? 3 : 1)) * FONT_HEIGHT_SMALL + 4);
size->height = max<uint>(size->height, size->width / 3);
}