/*
* create evenly spread out ticks along the y axis.
* The ticks are labeled as it goes
*/
void set_yticks(struct plot *plot, int num_ticks, int first, int last, char *units)
{
int pixels_per_tick = graph_height / num_ticks;
int step = (last - first) / num_ticks;
int i;
int tick_y = 0;
int text_x = axis_x() - 6;
int tick_x = axis_x();
char *anchor = "end";
for (i = 0; i < num_ticks; i++) {
if (i != 0) {
snprintf(line, line_len, "<line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" "
"style=\"stroke:lightgray;stroke-width:2;stroke-dasharray:9,12;\"/>\n",
tick_x, axis_y_off(tick_y),
axis_x_off(graph_width), axis_y_off(tick_y));
write_check(plot->fd, line, strlen(line));
}
snprintf(line, line_len, "<text x=\"%d\" y=\"%d\" font-family=\"%s\" font-size=\"%d\" "
"fill=\"black\" style=\"text-anchor: %s\">%d%s</text>\n",
text_x,
axis_y_off(tick_y - tick_font_size / 2),
font_family, tick_font_size, anchor, first + step * i, units);
write_check(plot->fd, line, strlen(line));
tick_y += pixels_per_tick;
}
snprintf(line, line_len, "<text x=\"%d\" y=\"%d\" font-family=\"%s\" font-size=\"%d\" "
"fill=\"black\" style=\"text-anchor: %s\">%d%s</text>\n",
text_x, axis_y_off(graph_height), font_family, tick_font_size, anchor, last, units);
write_check(plot->fd, line, strlen(line));
}
/*
* this draws a backing rectangle for the plot and it
* also creates a new svg element so our offsets can
* be relative to this one plot.
*/
void setup_axis(struct plot *plot)
{
int len;
int fd = plot->fd;
int bump_height = tick_font_size * 3 + axis_label_font_size;
int local_legend_width = legend_width;
if (plot->no_legend)
local_legend_width = 0;
plot->total_width = axis_x_off(graph_width) + graph_left_pad / 2 + local_legend_width;
plot->total_height = axis_y() + tick_label_pad + tick_font_size;
if (plot->add_xlabel)
plot->total_height += bump_height;
/* backing rect */
snprintf(line, line_len, "<rect x=\"%d\" y=\"%d\" width=\"%d\" "
"height=\"%d\" fill=\"white\" stroke=\"none\"/>",
plot->start_x_offset,
plot->start_y_offset, plot->total_width + 40,
plot->total_height + 20);
len = strlen(line);
write_check(fd, line, len);
snprintf(line, line_len, "<rect x=\"%d\" y=\"%d\" width=\"%d\" "
"filter=\"url(#shadow)\" "
"height=\"%d\" fill=\"white\" stroke=\"none\"/>",
plot->start_x_offset + 15,
plot->start_y_offset, plot->total_width, plot->total_height);
len = strlen(line);
write_check(fd, line, len);
plot->total_height += 20;
plot->total_width += 20;
if (plot->total_height + plot->start_y_offset > final_height)
final_height = plot->total_height + plot->start_y_offset;
if (plot->start_x_offset + plot->total_width + 40 > final_width)
final_width = plot->start_x_offset + plot->total_width + 40;
/* create an svg object for all our coords to be relative against */
snprintf(line, line_len, "<svg x=\"%d\" y=\"%d\">\n", plot->start_x_offset, plot->start_y_offset);
write_check(fd, line, strlen(line));
snprintf(line, 1024, "<path d=\"M%d %d h %d V %d H %d Z\" stroke=\"black\" stroke-width=\"2\" fill=\"none\"/>\n",
axis_x(), axis_y(),
graph_width + graph_inner_x_margin * 2, axis_y_off(graph_height) - graph_inner_y_margin,
axis_x());
len = strlen(line);
write_check(fd, line, len);
}
void set_plot_label(struct plot *plot, char *label)
{
int len;
int fd = plot->fd;
snprintf(line, line_len, "<text x=\"%d\" y=\"%d\" font-family=\"%s\" "
"font-size=\"%d\" fill=\"black\" style=\"text-anchor: %s\">%s</text>\n",
axis_x() + graph_width / 2,
plot_label_height / 2,
font_family, plot_label_font_size, "middle", label);
len = strlen(line);
write_check(fd, line, len);
}
/*
* create evenly spread out ticks along the xaxis. if tick only is set
* this just makes the ticks, otherwise it labels each tick as it goes
*/
void set_xticks(struct plot *plot, int num_ticks, int first, int last)
{
int pixels_per_tick;
double step;
int i;
int tick_y = axis_y_off(graph_tick_len) + graph_inner_y_margin;
int tick_x = axis_x();
int tick_only = plot->add_xlabel == 0;
int text_y = axis_y() + tick_label_pad;
char *middle = "middle";
char *start = "start";
step = find_step(first, last, num_ticks);
/*
* We don't want last two ticks to be too close together so subtract
* 20% of the step from the interval
*/
num_ticks = (double)(last - first - step) / step + 1;
pixels_per_tick = graph_width * step / (double)(last - first);
for (i = 0; i < num_ticks; i++) {
char *anchor;
if (i != 0) {
snprintf(line, line_len, "<rect x=\"%d\" y=\"%d\" width=\"2\" height=\"%d\" style=\"stroke:none;fill:black;\"/>\n",
tick_x, tick_y, graph_tick_len);
write_check(plot->fd, line, strlen(line));
anchor = middle;
} else {
anchor = start;
}
if (!tick_only) {
if (step >= 1)
snprintf(line, line_len, "<text x=\"%d\" y=\"%d\" font-family=\"%s\" font-size=\"%d\" "
"fill=\"black\" style=\"text-anchor: %s\">%d</text>\n",
tick_x, text_y, font_family, tick_font_size, anchor,
(int)(first + step * i));
else
snprintf(line, line_len, "<text x=\"%d\" y=\"%d\" font-family=\"%s\" font-size=\"%d\" "
"fill=\"black\" style=\"text-anchor: %s\">%.2f</text>\n",
tick_x, text_y, font_family, tick_font_size, anchor,
first + step * i);
write_check(plot->fd, line, strlen(line));
}
tick_x += pixels_per_tick;
}
if (!tick_only) {
if (step >= 1)
snprintf(line, line_len, "<text x=\"%d\" y=\"%d\" font-family=\"%s\" font-size=\"%d\" "
"fill=\"black\" style=\"text-anchor: middle\">%d</text>\n",
axis_x_off(graph_width - 2),
text_y, font_family, tick_font_size, last);
else
snprintf(line, line_len, "<text x=\"%d\" y=\"%d\" font-family=\"%s\" font-size=\"%d\" "
"fill=\"black\" style=\"text-anchor: middle\">%.2f</text>\n",
axis_x_off(graph_width - 2),
text_y, font_family, tick_font_size, (double)last);
write_check(plot->fd, line, strlen(line));
}
}
QImage Plotter::makePlot()
{
QImage img=QImage(width,height,QImage::Format_RGB32);
img.fill(0xffffff);
QPainter painter(&img);
painter.setFont(QFont(painter.font().family(),_fs));
//Отступы
QFontMetrics metrics(painter.font());
std::vector<int> lens;
foreach(QString str,_text_y)
lens.push_back(str.size());
float ident_left;
std::vector<int>::const_iterator it, it2;
for(int i=0;i<lens.size(); i++)
{
it2 = std::max_element(lens.begin(), lens.end());
if(lens.at(i)==*it2)
{
ident_left=metrics.width(_text_y[i])+metrics.width(_text_y[i])/5;
break;
}
}
float ident_right=metrics.width(_text_x[_text_x.size()-1])+metrics.width(_text_x[_text_x.size()-1])/5;
//Шаги и отступы снизу и сверху
float step_x=(width-ident_right-ident_left)/_text_x.size();
float step_y=height/(_text_y.size()+1);
float ident_bottom=step_y+_fs;
float ident_top=step_y+_fs;
step_y=(height-ident_top-ident_bottom)/(_text_y.size());
//Оси
QLineF axis_x(ident_left,height-ident_bottom,width-ident_right,height-ident_bottom);
QLineF axis_y(ident_left,height-ident_bottom,ident_left,ident_top);
//Черточки и подписи
QVector<QLineF> x_hyphen;
float hx_size=step_x/10;
float hy_size=step_y/10;
QList<QRectF> text_x_pos;
QStringList sl_x = _text_x.split(";",QString::SkipEmptyParts);
for(int i=0; i<sl_x.size();i++)
{
if(i<sl_x.size()-1)
x_hyphen.append(QLineF(ident_left+(i+1)*step_x,height-ident_bottom-hx_size,ident_left+(i+1)*step_x,height-ident_bottom));
QFontMetrics metrics(painter.font());
if(i==sl_x.size()-1)
{
text_x_pos.append(QRectF(ident_left+(i+1)*step_x,height-ident_bottom+_fs+hy_size*2,step_x,ident_bottom-_fs-hy_size*2));
//text_x_pos.append(QRectF(x,y,w,h))
}
else
{
//text_x_pos.append(QPointF(ident_left+(i+1)*step_x-metrics.width(text_x[i])/2,height-ident_bottom+font+hy_size*2))
text_x_pos.append(QRectF(ident_left+(i+1)*step_x-metrics.width(sl_x[i])/2,height-ident_bottom+_fs+hy_size*2,step_x,ident_bottom-_fs-hy_size*2));
}
}
QVector<QLineF> y_hyphen;
QList<QPointF> text_y_pos;
QStringList sl_y = _text_y.split(";",QString::SkipEmptyParts);
for(int i=0; i<sl_y.size();i++)
{
if(i<sl_y.size()-1)
y_hyphen.append(QLineF(ident_left,height-ident_bottom-(i+1)*step_y,ident_left+hy_size,height-ident_bottom-(i+1)*step_y));
QFontMetrics metrics(painter.font());
if(i==sl_y.size()-1)
text_y_pos.append(QPointF(ident_left-metrics.width(sl_y[i])/2,ident_top/2+_fs/2));
else
text_y_pos.append(QPointF(ident_left-metrics.width(sl_y[i])-hy_size,height-ident_bottom-(i+1)*step_y+_fs/2));
}
//Точки графика
QVector<QPoint> graph_points;
QVector<QLineF> dot_line_x;
QVector<QLineF> dot_line_y;
int dataCount = scriptEngine->evaluate("results.length").toInteger();
for(int i=0;i<dataCount; i++)
{
QScriptValue index = QScriptValue(i);
scriptEngine->globalObject().setProperty("index",index);
float curResult = (float)scriptEngine->evaluate("results[index]").toNumber();
graph_points.append(QPoint(ident_left+step_x*(i+1),height-(ident_bottom+curResult*step_y)));
dot_line_x.append(QLineF(QPointF(ident_left,graph_points[graph_points.size()-1].y()),graph_points[graph_points.size()-1]));
dot_line_y.append(QLineF(QPointF(graph_points[graph_points.size()-1].x(),height-ident_bottom),graph_points[graph_points.size()-1]));
}
//Перья для рисования
QPen axis_pen(Qt::black);
axis_pen.setWidth(4);
QPen dot_pen(Qt::black);
dot_pen.setWidth(1);
dot_pen.setStyle(Qt::DotLine);
QPen main_pen(Qt::black);
main_pen.setWidth(2);
QPen point_pen(Qt::red);
point_pen.setWidth(4);
//Рисуем
//Оси
painter.setRenderHint(QPainter::Antialiasing);
painter.setPen(axis_pen);
painter.drawLine(axis_x);
painter.drawLine(axis_y);
//Черточки и подписи
painter.setPen(main_pen);
painter.drawLines(x_hyphen);
painter.drawLines(y_hyphen);
for(int i=0; i<text_x_pos.size(); i++)
{
if(i==text_x_pos.size()-1)
{
QFont nf(painter.font());
nf.setWeight(QFont::Bold);
painter.setFont(nf);
painter.drawText(text_x_pos[i],QString(sl_x[i]));
nf.setWeight(QFont::Normal);
painter.setFont(nf);
}
else
painter.drawText(text_x_pos[i],Qt::TextWordWrap,QString(sl_x[i]));
}
for(int i=0;i<text_y_pos.size();i++)
{
if(i==text_y_pos.size()-1)
{
QFont nf(painter.font());
nf.setWeight(QFont::Bold);
painter.setFont(nf);
painter.drawText(text_y_pos[i],QString(sl_y[i]));
nf.setWeight(QFont::Normal);
painter.setFont(nf);
}
else
painter.drawText(text_y_pos[i],QString(sl_y[i]));
}
//График
QPolygon p(graph_points);
painter.drawPolyline(p);
//Пунктирные линии
painter.setRenderHint(QPainter::Antialiasing,false);
painter.setPen(dot_pen);
painter.drawLines(dot_line_x);
painter.drawLines(dot_line_y);
//Точки графика
painter.setRenderHint(QPainter::Antialiasing);
painter.setPen(point_pen);
painter.drawPoints(p);
return img;
}