114 lines
3.4 KiB
C++
114 lines
3.4 KiB
C++
// Viewport Demo
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// See viewport_commands tab for details of functions available
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// This example uses the viewport commands to create a "virtual TFT" within the
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// normal TFT display area. This allows a sketch written for a smaller screen to
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// be run in a viewport window. By default, the graphics 0,0 datum is set to the
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// top left corner of the viewport, but optionally the datum can be kept at the
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// corner of the TFT.
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// Viewports have a number of potential uses:
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// - create a "virtual" TFT screen smaller than the actual TFT screen
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// - render GUI items (menus etc) in a viewport, erase GUI item by redrawing whole screen,
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// this will be fast because only the viewport will be refreshed (e.g. clearing menu)
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// - limit screen refresh to a particular area, e.g. changing numbers, icons or graph plotting
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// - showing a small portion of a larger image or sprite, this allows panning and scrolling
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// A viewport can have the coordinate datum (position 0,0) either at the top left corner of
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// the viewport or at the normal top left corner of the TFT.
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// Putting the coordinate datum at the viewport corner means that functions that draw graphics
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// in a fixed position can be relocated anywhere on the screen. (see plotBox() below). This
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// makes it easier to reposition groups of graphical objects (for example GUI buttons) that have
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// fixed relative positions.
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#include <SPI.h>
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#include <TFT_eSPI.h>
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TFT_eSPI tft = TFT_eSPI();
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void setup() {
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Serial.begin(115200);
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tft.init();
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tft.setRotation(1);
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tft.fillScreen(TFT_BLACK);
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}
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void loop()
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{
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// Normal Screen
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drawX();
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delay(2000);
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// Viewport screen
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tft.setViewport(10, 10, 140, 100);
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tft.frameViewport(TFT_NAVY, -2);
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tft.fillScreen(TFT_BLACK);
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drawX();
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tft.resetViewport();
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delay(2000);
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//Normal screen
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tft.fillScreen(TFT_BLACK);
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drawX();
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delay(2000);
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tft.fillScreen(TFT_BLACK);
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// Viewport as a clipping window (false parameter means coordinate datum stays at TFT top left)
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tft.setViewport(10, 10, tft.width()/2 - 10, tft.height() - 20, false);
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//tft.frameViewport(TFT_NAVY, 2); // Add 2 pixel border inside viewport
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//tft.frameViewport(TFT_NAVY, -2); // Add 2 pixel border outside viewport
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drawX();
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delay(2000);
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while(1)
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{
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tft.resetViewport(); // Reset viewport so width() and height() return TFT size
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uint16_t w = 40;
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uint16_t h = 40;
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uint16_t x = random(tft.width() - w);
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uint16_t y = random(tft.height() - h);
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tft.setViewport(x, y, w, h);
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plotBox();
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delay(0);
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}
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}
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void drawX(void)
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{
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tft.fillScreen(tft.color565(25,25,25)); // Grey
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// Draw circle
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tft.drawCircle(tft.width()/2, tft.height()/2, tft.width()/4, TFT_RED);
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// Draw diagonal lines
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tft.drawLine(0 , 0, tft.width()-1, tft.height()-1, TFT_GREEN);
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tft.drawLine(0 , tft.height()-1, tft.width()-1, 0, TFT_BLUE);
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tft.setTextDatum(MC_DATUM);
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tft.setTextColor(TFT_WHITE, tft.color565(25,25,25));
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tft.drawString("Hello World!", tft.width()/2, tft.height()/2, 4); // Font 4
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}
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void plotBox(void)
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{
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// These are always plotted at a fixed position but they can
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// be plotted into a viewport anywhere on the screen because
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// a viewport can move the screen datum
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tft.fillScreen(TFT_BLACK); // When a viewport is set, this just fills the viewport
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tft.drawRect(0,0, 40,40, TFT_BLUE);
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tft.setTextDatum(MC_DATUM);
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tft.setTextColor(TFT_WHITE);
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tft.drawNumber( random(100), 20, 23, 4); // Number in font 4
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}
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