UpsilonNumworks/Upsilon
1
0
Fork 0
mirror of https://github.com/UpsilonNumworks/Upsilon.git synced 2026-03-21 14:50:44 +01:00
Code Issues Packages Projects Releases Wiki Activity

Plot auto zooms.

Browse Source 
Change-Id: I8c15f4265e098ff05fcddf3226409491913ae8e0
This commit is contained in:
Felix Raimundo
2016-04-07 16:51:37 +02:00
parent 8025b5d77b
commit efb35e184a
3 changed files with 37 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files

58
app/plot.cpp
View File

@@ -13,6 +13,9 @@ extern "C" {
constexpr KDCoordinate kScreenWidth = SCREEN_WIDTH;
const KDCoordinate kScreenHeight = SCREEN_HEIGHT;
static float plotValues[kScreenWidth];
static float yMin, yMax;
// For now we only plot the axes at the origin.
// TODO: print axes not at the origin with some values too.
// TODO: label the axes.
@@ -32,40 +35,49 @@ static void plot_axes(float xMin, float xMax, float yMin, float yMax) {
}
}
// TODO: Add a cursor.
// TODO: print the expression.
void plot(Expression * e, float xMin, float xMax, float yMin, float yMax) {
static void fill_values(Expression * e, float xMin, float xMax) {
assert(e);
Context plotContext;
// Plot the original axes.
plot_axes(xMin, xMax, yMin, yMax);
// We need to initialize the first point.
// Initialize min and max.
Float xExp = Float(xMin);
plotContext.setExpressionForSymbolName(&xExp, "x");
float y = e->approximate(plotContext);
KDCoordinate j = ((y-yMin) / (yMax-yMin) * kScreenHeight);
if (j < 0) {
j = 0;
} else if (j >= kScreenHeight) {
j = kScreenHeight - 1;
}
KDPoint previousPoint = KDPointMake(0, kScreenHeight-j);
plotValues[0] = e->approximate(plotContext);
yMin = plotValues[0];
yMax = plotValues[0];
for (KDCoordinate i = 1; i < kScreenWidth; i++) {
float x = xMin + (xMax-xMin)/kScreenWidth*i;
Float xExp = Float(x);
plotContext.setExpressionForSymbolName(&xExp, "x");
float y = e->approximate(plotContext);
KDCoordinate j = ((y-yMin) / (yMax-yMin) * kScreenHeight);
KDPoint currentPoint = KDPointMake(i, kScreenHeight-j);
if (currentPoint.y < 0) {
currentPoint.y = 0;
} else if (currentPoint.y >= kScreenHeight) {
currentPoint.y = kScreenHeight - 1;
plotValues[i] = e->approximate(plotContext);
if (plotValues[i] > yMax) {
yMax = plotValues[i];
}
if (plotValues[i] < yMin) {
yMin = plotValues[i];
}
}
}
// TODO: Add a cursor.
// TODO: print the expression.
void plot(Expression * e, float xMin, float xMax) {
assert(e);
fill_values(e, xMin, xMax);
// Plot the original axes.
plot_axes(xMin, xMax, yMin, yMax);
// We need to initialize the first point.
KDCoordinate j = ((plotValues[0]-yMin) / (yMax-yMin) * (kScreenHeight - 1));
KDPoint previousPoint = KDPointMake(0, kScreenHeight - 1 - j);
for (KDCoordinate i = 1; i < kScreenWidth; i++) {
// TODO: check for yMin == yMax
KDCoordinate j = ((plotValues[i]-yMin) / (yMax-yMin) * (kScreenHeight - 1));
KDPoint currentPoint = KDPointMake(i, kScreenHeight - 1 - j);
KDDrawLine(previousPoint, currentPoint, 0xFF);
previousPoint = currentPoint;
}