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Adjust left limit for drawing (#219)

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* adjust left limit for drawing

do draw area also if part just of it is visible - e.g. do not skip whole letter in rolling description if half of it can be shown

* render just visible area part

* fix visible area part computation
This commit is contained in:
Jan Krupička
2018-03-07 02:01:59 +01:00
committed by Ben V. Brown
parent a30569eda2
commit b46c17078b
1 changed files with 15 additions and 8 deletions
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23
workspace/TS100/src/OLED.cpp
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@@ -286,25 +286,32 @@ void OLED::drawSymbol(uint8_t symbolID) {
void OLED::drawArea(int16_t x, int8_t y, uint8_t wide, uint8_t height,
const uint8_t* ptr) {
// Splat this from x->x+wide in two strides
if (x < 0)
if (x <= -wide)
return; //cutoffleft
if ((x) > 96)
if (x > 96)
return; //cutoff right
uint8_t width = wide;
if ((x + wide) > 96)
width = 96 - x; // trimming to draw partials
uint8_t visibleStart = 0;
uint8_t visibleEnd = wide;
// trimming to draw partials
if(x < 0) {
visibleStart -= x; //subtract negative value == add absolute value
}
if(x + wide > 96) {
visibleEnd = 96 - x;
}
if (y == 0) {
//Splat first line of data
for (uint8_t xx = 0; xx < (width); xx++) {
for (uint8_t xx = visibleStart; xx < visibleEnd; xx++) {
firstStripPtr[xx + x] = ptr[xx];
}
}
if (y == 8 || height == 16) {
// Splat the second line
for (uint8_t xx = 0; xx < width; xx++) {
for (uint8_t xx = visibleStart; xx < visibleEnd; xx++) {
secondStripPtr[x + xx] = ptr[xx + (height == 16 ? wide : 0)];
}
}
}