119 lines
4.4 KiB
C++
119 lines
4.4 KiB
C++
/*
|
|
Sketch to show scrolling of the graphics in sprites.
|
|
Scrolling in this way moves the pixels in a defined rectangle
|
|
within the Sprite. By default the whole sprite is scrolled.
|
|
The gap left by scrolling is filled with a defined colour.
|
|
|
|
Example for library:
|
|
https://github.com/Bodmer/TFT_eSPI
|
|
|
|
A Sprite is notionally an invisible graphics screen that is
|
|
kept in the processors RAM. Graphics can be drawn into the
|
|
Sprite just as it can be drawn directly to the screen. Once
|
|
the Sprite is completed it can be plotted onto the screen in
|
|
any position. If there is sufficient RAM then the Sprite can
|
|
be the same size as the screen and used as a frame buffer.
|
|
|
|
A 16 bit Sprite occupies (2 * width * height) bytes in RAM.
|
|
|
|
An 8 bit Sprite occupies (width * height) bytes in RAM.
|
|
|
|
*/
|
|
|
|
#include <TFT_eSPI.h>
|
|
|
|
TFT_eSPI tft = TFT_eSPI();
|
|
|
|
TFT_eSprite graph1 = TFT_eSprite(&tft); // Sprite object graph1
|
|
|
|
TFT_eSprite stext1 = TFT_eSprite(&tft); // Sprite object stext1
|
|
|
|
TFT_eSprite stext2 = TFT_eSprite(&tft); // Sprite object stext2
|
|
|
|
int graphVal = 1;
|
|
int delta = 1;
|
|
int grid = 0;
|
|
int tcount = 0;
|
|
|
|
//==========================================================================================
|
|
void setup() {
|
|
tft.init();
|
|
tft.fillScreen(TFT_BLACK);
|
|
|
|
// Create a sprite for the graph
|
|
graph1.setColorDepth(8);
|
|
graph1.createSprite(128, 61);
|
|
graph1.fillSprite(TFT_BLUE); // Note: Sprite is filled with black when created
|
|
|
|
// The scroll area is set to the full sprite size upon creation of the sprite
|
|
// but we can change that by defining a smaller area using "setScrollRect()"if needed
|
|
// parameters are x,y,w,h,color as in drawRect(), the color fills the gap left by scrolling
|
|
//graph1.setScrollRect(64, 0, 64, 61, TFT_DARKGREY); // Try this line to change the graph scroll area
|
|
|
|
// Create a sprite for the scrolling numbers
|
|
stext1.setColorDepth(8);
|
|
stext1.createSprite(32, 64);
|
|
stext1.fillSprite(TFT_BLUE); // Fill sprite with blue
|
|
stext1.setScrollRect(0, 0, 32, 64, TFT_BLUE); // here we set scroll gap fill color to blue
|
|
stext1.setTextColor(TFT_WHITE); // White text, no background
|
|
stext1.setTextDatum(BR_DATUM); // Bottom right coordinate datum
|
|
|
|
// Create a sprite for Hello World
|
|
stext2.setColorDepth(8);
|
|
stext2.createSprite(80, 16);
|
|
stext2.fillSprite(TFT_DARKGREY);
|
|
stext2.setScrollRect(0, 0, 40, 16, TFT_DARKGREY); // Scroll the "Hello" in the first 40 pixels
|
|
stext2.setTextColor(TFT_WHITE); // White text, no background
|
|
}
|
|
|
|
//==========================================================================================
|
|
void loop() {
|
|
// Draw point in graph1 sprite at far right edge (this will scroll left later)
|
|
graph1.drawFastVLine(127,60-graphVal,2,TFT_YELLOW); // draw 2 pixel point on graph
|
|
|
|
// Draw number in stext1 sprite at 31,63 (bottom right datum set)
|
|
stext1.drawNumber(graphVal, 31, 63, 2); // plot value in font 2
|
|
|
|
// Push the sprites onto the TFT at specified coordinates
|
|
graph1.pushSprite(0, 0);
|
|
stext1.pushSprite(0, 64);
|
|
stext2.pushSprite(40, 70);
|
|
|
|
// Change the value to plot
|
|
graphVal+=delta;
|
|
|
|
// If the value reaches a limit, then change delta of value
|
|
if (graphVal >= 60) delta = -1; // ramp down value
|
|
else if (graphVal <= 1) delta = +1; // ramp up value
|
|
|
|
delay(50); // wait so things do not scroll too fast
|
|
|
|
// Now scroll the sprites scroll(dt, dy) where:
|
|
// dx is pixels to scroll, left = negative value, right = positive value
|
|
// dy is pixels to scroll, up = negative value, down = positive value
|
|
graph1.scroll(-1, 0); // scroll graph 1 pixel left, 0 up/down
|
|
stext1.scroll(0,-16); // scroll stext 0 pixels left/right, 16 up
|
|
stext2.scroll(1); // scroll stext 1 pixel right, up/down default is 0
|
|
|
|
// Draw the grid on far right edge of sprite as graph has now moved 1 pixel left
|
|
grid++;
|
|
if (grid >= 10)
|
|
{ // Draw a vertical line if we have scrolled 10 times (10 pixels)
|
|
grid = 0;
|
|
graph1.drawFastVLine(127, 0, 61, TFT_NAVY); // draw line on graph
|
|
}
|
|
else
|
|
{ // Otherwise draw points spaced 10 pixels for the horizontal grid lines
|
|
for (int p = 0; p <= 60; p += 10) graph1.drawPixel(127, p, TFT_NAVY);
|
|
}
|
|
|
|
tcount--;
|
|
if (tcount <=0)
|
|
{ // If we have scrolled 40 pixels the redraw text
|
|
tcount = 40;
|
|
stext2.drawString("Hello World", 6, 0, 2); // draw at 6,0 in sprite, font 2
|
|
}
|
|
|
|
} // Loop back and do it all again
|
|
//==========================================================================================
|